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Gender Effect on Views of Wisdom and Wisdom Levels

Gender differences in wisdom are an important theme in mythology, philosophy, psychology, and daily life. Based on the existing psychological research, consensus and dispute exist between the two genders on the views of wisdom and in the levels of wisdom. In terms of the views of wisdom, the way men and women view wisdom is highly similar, and from the perspectives of both ordinary people and professional researchers of wisdom psychology, wise men and women are extremely similar. Regarding wisdom level, research has revealed that, although significant gender effects exist in the level of overall wisdom, reflective and affective dimension, and interpersonal conflict coping styles, the effect sizes were small, which indicated that these gender differences were not obvious. It would be desirable for future research to combine multiple wisdom measurements, strengthen research on the psychological gender effect of wisdom, and focus on the moderating role of age on the relationship between wisdom and gender.


INTRODUCTION
Are there gender differences in wisdom? The human debate on this issue has continued for thousands of years. Considering ancient Chinese and Western philosophical comparisons of wisdom between men and women, although there are views that "men and women complement each other, " the idea of "strong men and weak women" always dominates. Regarding this issue, arguably, the most famous classic expressions in the West emanated from the works of Plato. Although Plato admitted that "the best policy for a city is to make women share with men in everything, " (Plato, 1902(Plato, /2009, he also proposed that "doubtless man is superior, as the whole, in capacity and strength" (p. 283). A similar statement in Plato's Dialogues by Timaeus states that "men who were cowards or led unrighteous lives may be supposed to have changed into the nature of women in the second generation" (Plato, 1892, p. 513). Here, "righteous" refers to conquered fear, anger, and the opposite affections (p. 358). From these remarks, seen through Plato's eyes, it appears that he believed women had a much lower virtue than men. Later, Christianity inherited this Greek philosophical view of the relationship between wisdom and gender that women are unwise and, therefore, must obey the teaching of their husbands. This can be seen in the Old Testament story of Adam and Eve: Eve lacked self-control and was tempted to steal the forbidden fruit, leading to the expulsion of humankind from the Garden of Eden. Another punishment from Jehovah for her was that "you will adore your husband, and your husband will rule you." In Chinese culture, this view is represented by Confucian culture. Confucianism, as a traditional doctrine of a patriarchal society, emphasized the roles and ethical obligations of women, advocated that men are superior to women, and believed that women do not have independent personality and wisdom (Yao, 2000, pp. 183-184). From the perspective of Confucianism, the ideal personality of women is one based on attachment and obedience (Zhu, 2006, pp. 93-127), and their wisdom is mainly manifested in assisting their husbands, raising children, serving parents and parental in-laws, and managing family affairs (Wang, 2019, pp. 140-142). Conversely, the ideal personality of men is that of a gentleman, and their wisdom is reflected in dealing with the relationship between heaven and man, others and himself, body, and mind, and subject and object (Wang and Zheng, 2014, pp. 246-251). Essentially, this view holds that ideal men are wiser than ideal women because the number and difficulty of the tasks of men and the range of benefits derived from their behavior are far better than those of women. From these viewpoints, we can clearly see the gender effect from the Confucian view in the notions of strong, wise men and weak women. In summary, although Chinese and Western philosophers lived in different sociocultural backgrounds and historical traditions, they all believed that women were less wise than men.
As an important part of both Chinese and Western philosophies, this view of gender differences in wisdom has exerted an extensive and profound influence on the collective understanding of wisdom and the relationship between men and women. However, is this standpoint reasonable? Does it conform to objective facts? These questions have long plagued people. Since the 1980s, when the notion of life-span development emerged, with research on the wisdom of the elderly and positive psychology (Yang, 2008), wisdom psychology has attracted much attention. Therefore, the psychological connotation of wisdom has become increasingly clear, and various measures and paradigms consistent with the standards of modern psychometrics have also been developed (Kunzmann, 2019;Webster, 2019). Using these tools, scholars can conduct more objective and in-depth empirical discussions on gender similarities and differences in wisdom and thus provide preliminary answers to the above questions. To expand, discussing possible gender differences in wisdom focuses on two issues: (a) the relationship between gender and views of wisdom and (b) gender effects on wisdom levels. Generally, most philosophers pay attention to only the latter question, whereas psychologists attach equal importance to the two, and significant progress has been made in both fields.
Therefore, a systematic review and brief comment on existing research in the field of wisdom psychology will reveal the relationship between wisdom and gender. This not only provides ideas and enlightenment for follow-up research on the gender effects of wisdom but also provides a powerful reference for the formulation of gender-specific public policies, organizational strategies, and behavioral norms in all aspects of life.
Before embarking on this review, we must clarify that although we do not deny that gender and sex are considerably different in concept and characteristics (Cretella et al., 2019), some researchers use these two terms interchangeably and do not distinguish between them in practice, especially while collecting and analyzing data (Helgeson, 2017, p. 30). When collecting data, most of the previous empirical studies that claim to examine the relationship between wisdom and psychological gender required subjects to report biological sex but not psychological gender. In this sense, these studies are merely exploring the association between wisdom and biological sex (Hyde et al., 2019). That said, studies that explored both the psychological gender effect and biological sex effect of wisdom were included in this review.

GENDER AND VIEWS OF WISDOM
The view of wisdom refers to opinions on wisdom. The relationship between gender and views of wisdom can be divided into two sub-questions. First, (a) are there differences in views of wisdom between men and women -do men and women think the same about wisdom? This question will be referred to as the "gender effect on views of wisdom." Second, (b) do people have different views of wise men and wise women? That is, in the collective conception, whether wise men and women have similar personality, competence, and morality and will be referred to as the "gender effect on wise nominees." These two questions are discussed in detail below.

Gender Effect on Views of Wisdom
Overall, the ways in which men and women view wisdom are highly similar. Specifically, men and women similarly understand the connotations of wisdom. For example, Glück et al. (2012) asked participants to judge the fitness of given adjectives relating to wisdom according to their own understanding of wisdom. The results showed that 90% of the participants thought that wisdom was more closely related to adjectives such as friendly, intelligent, sensitive, honest, and highly intelligent, and there was no significant gender difference.
Meanwhile, men and women have almost identical opinions of the real-life manifestations of wisdom. "Wisdom events" personally experienced by men and women are different in domain and focus but are essentially the same and can be summarized into the following five categories: helping others and contributing to society to strive for common good, achieving and maintaining a satisfactory state of life, deciding life paths, solving problems and challenges at work, and insisting on doing what they think is right when facing diversity (Yang, 2008). For example, men reported wisdom events as "accurately positioning and adjusting their role in the workplace, and pursuing personal growth" and women reported wisdom events as "maintaining a satisfactory relationship between family members"; these may be far apart in content, but they belong to the same category "achieving and maintaining a satisfactory state of life, " which was defined as people actively pursuing their goals and striving to achieve their ideal way of life (Yang, 2008). Spiritual fulfillment, career success, harmony in interpersonal relationships, work-life balance, and realizing their self-worth all fall into this category.
There are two possible explanations for these phenomena. First, the essence of this type of research is group comparison, which considers the similarities and differences between the general views of wisdom collectively held by respective male and female groups. This approach obscures those outlying views on wisdom held by the general public; therefore, insignificant results between the genders are increasingly likely. For example, a few people may nominate those with high levels of Machiavellianism as wise; in the process of statistical analysis, this minority view of wisdom will be neutralized by mainstream ideas and, thus, will not appear in the results. In this case, unless most men and women hold different views of wisdom, there is little possibility of significant gender differences appearing in the results.
Second, this type of research is mostly an intra-cultural comparison. The viewpoints on "What is wisdom" and "What kind of person can be regarded as a wise person" received from the social environment and practical activities by individuals from the same cultural background are very similar, regardless of gender (Wang and Zheng, 2014, pp. 268-276;Grossmann and Kung, 2018;Grossmann et al., 2020). Consequently, they are extremely likely to form highly consistent views of wisdom. Two empirical studies provided evidence for this assumption that people from the same culture possess a high degree of homogeneity in views of wisdom. Wang and Zheng (2014, pp. 285-294) invited 167 Chinese university students to nominate wise persons, and results found that the average mention rate of the top five wise people (i.e., Laozi, Socrates, Confucius, Mencius, and Marx) was 85.12%. In other words, 85.12% of participants regard these five as wise people. Weststrate et al. (2016) conducted a wisdom nomination study in a sample of Westerns and found that among the 303 wisdom nominees, the top 13 wisest people were nominated 169 times, accounting for 56% of the total. Of course, we do not rule out the possibility that persons from the same culture have differing perspectives on wisdom. After all, individual attributes (such as socioeconomic status and educational background) will also influence views of wisdom. We only want to point out that people from the same culture are more likely to develop similar views of wisdom.
In addition, it is also essential to understand the views of wisdom of individuals from different cultures. Previous studies have shown that individuals from different cultures have certain similarities in their views of wisdom; for example, both Chinese and Western concepts of wisdom include elements of virtue and intelligence and advocate the use of wisdom to solve real-life problems (Wang et al., 2021). However, there are also differences in the views of wisdom among individuals from different cultures (see review, Yang and Intezari, 2019); for example, researchers found that Chinese views of wisdom comprised two culturally specific components -the "spirituality of disengagement" and a "positive mindset" (Hu et al., 2018).

Gender Effect on Wise Nominees
Wise men and women are highly similar, whether through the eyes of ordinary people or professional researchers of wisdom psychology. Specifically, for ordinary people, their descriptions of wise men are considerably similar to those of wise women (König and Glück, 2012). For example, in the research by Glück et al. (2009), participants were first asked to read two pieces of paper; the first one read "Paul, his friends think he is a wise man, " and the second one read "Paula, is considered by her friends to be a wise woman." Participants were then asked to evaluate the degree of correspondence between these two virtual characters with 80 adjectival words (or phrases), involving many aspects like knowledge and life experience, fluid intelligence, insight, reflection, openness, emotional management, caring for others, and practical skills. Results showed that there was no significant difference between the descriptions of the participant of "Paul" and "Paula, " which indicated that according to ordinary people, wise men resemble wise women in personality traits and abilities.
Also, wisdom psychology researchers view wise men and wise women similarly, which is mainly reflected in the fact that most of these scholars do not distinguish between gender when defining wisdom. In other words, they believe that there is no need to discuss them separately because the same sets of wisdom theories, as well as scales and paradigms, can be used to understand and measure the wisdom of men and women.
In summary, in the eyes of most people, a wise person is androgynous, with both high levels of masculinity and femininity (Orwoll and Achenbaum, 1993;Ardelt, 2009). This seems to contradict the common belief that society holds different expectations of men and women -social expectation theory; however, it does not. Mainline gender expectations held by ordinary society are aimed at ordinary people and are not suitable for wise persons above the social average in all aspects. For example, men are expected to be agentic, while women are communal (Ellemers, 2018;Eagly et al., 2019). This is true for describing ordinary men and women but is not suitable for depicting wise men and women. This is because almost all existing wisdom psychological models advocate that wise person has both high agency and community; they not only pursue the smooth solution of practical problems and the realization of personal goals but also pay attention to maintaining harmonious and stable relationships with others .
In addition to asking participants to describe wise men and women, wisdom nomination research can illuminate the gender effect of wise nominees. Nowadays, most wisdom nomination research has found that men are more likely than women to be nominated as wise persons (Weststrate et al., 2016). For example, Yang (2008Yang ( , 2011 invited 200 adults from Taiwan, China, to write down the names of two people they thought were wise; 66 nominees were collected, and most were men (55, 77%). For another example, in a historical wise people nomination research, 209 participants nominated a total of 106 wise people, of which 81 were men (76%) and only 25 were women (Weststrate et al., 2016).
Does this mean that the general public thought that men are wiser than women? The answer is no. In fact, scholars believe that this finding, while common, cannot truly reflect the view of the public of wise men and women. They prefer to explain this phenomenon by the social atmosphere and the different social statuses of the two genders. Specifically, human history has been dominated by the patriarchal system; in most historical periods, men have been in dominant familial and societal positions. Thus, they have had more opportunities to publicly display their wisdom, whereas women have had comparatively fewer opportunities to be seen outside of the family (Weststrate et al., 2016). Consequently, few wisdom stories of women existed to be passed down orally or recorded. Accordingly, when nominating wise persons, there is a scarcity of wise women to choose from; therefore, women are naturally far less likely to be nominated as wise than men.

GENDER AND WISDOM LEVEL
The results of current studies have not yet reached a consensus regarding the relationship between wisdom level and gender. To explore this gender effect more comprehensively, this study systematically reviewed the related published empirical studies.
To collect the relevant literature as comprehensively as possible, we searched in PsycINFO, ScienceDirect, Scopus, Web of Science, EBSCO, and ProQuest Dissertation database using "wisdom" as the title and keyword successively. The search field was limited to Social Sciences, and the search direction was limited to Psychology. The retrieval dates ranged from 2000 to 2020, and the databases were searched on November 25, 2020. Additionally, to retrieve more eligible studies, we searched the references from our retrieved articles for other leads. A total of 4873 papers were identified.
Duplicate documents (n = 1207) were deleted first. Subsequently, an initial screening was conducted by reading topics and abstracts; papers that did not target the normal population and were not topically related to wisdom, reviews, and survey reports were deleted (n = 3519). Next, a second screening round was performed on the remaining 147 documents. The inclusion criteria were (a) written in English, (b) full text available, and (c) must have reported empirical results of gender effect on the level of overall wisdom or that of wisdom dimensions. Articles unassociated with wisdom psychology and those that were associated with wisdom psychology but did not report any empirical results of gender effects were excluded. Additionally, studies that reported the same sample pool used in previously included studies were also excluded. Consequently, 50 empirical studies met these standards. These two rounds of literature screening processes are shown in Figure 1.
The 50 articles included in this systematic review were coded as follows: study ID, author name, publication year, geographic region, sample size (female ratio), mean age of the sample (age range), wisdom measurement tools, empirical results of the gender effect of level of overall wisdom, and empirical results of the gender effect of level of wisdom dimensions. Two coders coded separately according to the abovementioned inclusion and exclusion criteria, and the coding consistency was 90.9%, indicating that the coding of the literature was effective and accurate. The results after encoding are shown in Tables 1, 2.
Overall, the current empirical research has generated contradictory results: (a) the wisdom level of men and women is basically the same and (b) significant gender differences exist at the wisdom level.

Insignificant Gender Effect on the Levels of Overall Wisdom
Regarding overall wisdom, extensive research varied in theoretical basis and measurement tools and found no significant effect on the level of overall wisdom. Baltes and Staudinger (2000), based on previous studies on expertise and cultural-historical analyses of wisdom and the standpoints of neo-Piagetian and lifespan development psychology, perceived wisdom as an expert knowledge system in the fundamental pragmatics of life and proposed five criteria to evaluate wisdom levels: rich factual and procedural knowledge, lifespan contextualism, relativism of values and life priorities, and recognition and management of uncertainty. Based on this, Wink and Staudinger (2016) investigated the wisdom levels of 163 white people aged 68-77 years and found no significant difference between genders. Webster (2007) proposed that wisdom is the ability and intention of an individual to apply critical life experiences to promote the optimal development of self and others. He deconstructed wisdom into five dimensions -experience, emotional regulation, reminiscence and reflectiveness, openness, and humor -and subsequently developed the corresponding measurement tool -the self-assessed wisdom scale (SAWS) (Webster, 2003). A study using SAWS in a sample of 142 Chinese elderly found no significant gender difference in the overall wisdom levels (Cheung and Chow, 2019).
Ardelt (2003) conceptualized wisdom as a personality trait integrating three dimensions, namely, cognitive, reflective, and affective, and produced a corresponding three-dimension wisdom scale (3D-WS). These three dimensions of wisdom correspond to those obtained from previous analyses based on the views of wisdom of laypeople (Clayton and Birren, 1980;Sternberg, 1990). Of these dimensions, reflective refers to looking at events and phenomena from different perspectives to develop self-awareness, avoiding blaming others or circumstances for their present situation, accurately perceiving, effectively regulating emotions, and forgiving self and others. Cognitive refers to the ability and willingness of an individual to comprehend the significance and deeper meaning of phenomena and events dialectically and thoroughly, to recognize the unpredictability and uncertainties of human nature and life. Affective means being sympathetic and compassionate to all people. Similarly, empirical research using this scale found no significant difference in the overall wisdom scores between men and women .
From the perspective of lifelong development, Levenson et al. (2005) proposed that wisdom reflects individuals no longer rely on externals (such as material, social role, achievement, and relationships) for the definition of the self, but focus on the interiority and spirituality, and a strong sense of connectedness with past and future. They argued that wisdom is a synthesis of the results of the three development stages: self-knowledge, detachment, and integration. This theory also uses a selfreporting scale to measure wisdom -adult self-transcendence inventory (ASTI; Levenson et al., 2005). Empirical studies using this scale also did not find significant gender effects on overall wisdom (Le and Levenson, 2005;Levenson et al., 2005;König and Glück, 2014). Grossmann et al. (2010) argued that wisdom is a trait that helps people make wise decisions and involves wise reasoning that guides people through important challenges in social life. Another corresponding scale -situated wisdom reasoning scale (SWIS) -includes five dimensions: intellectual humility, recognition of multiple ways a situation may unfold and change, adopting an outsider viewpoint, recognition of perspectives of others, consideration of conflict resolution, and search for compromise (Brienza et al., 2018). Empirical research using this scale in a Chinese sample did not find any significant gender effect on overall wisdom (Wei and Wang, 2020).
Finally, Thomas et al. (2019a), based on theoretical models in psychology and neurobiology, developed the San Diego wisdom scale (SD-WISE) through a neurobiology lens; similarly, no significant gender differences in overall wisdom were found using SD-WISE .

Insignificant Gender Effect on the Levels of Wisdom Dimensions
Similarly, extensive studies have found no significant gender differences in the level of wisdom dimensions. These studies used various scales, including but not limited to 3D-WS (Alhosseini and Ferrari, 2019) and WDS (Wisdom Development Scale, Saleem et al., 2017), and both found that no gender effect on the level of wisdom dimensions was established.
In conclusion, the above studies indicated that there is no significant gender effect in overall wisdom or its dimensions. The scales used in these studies have a solid theoretical basis and ideal reliability and validity; therefore, these empirical results are reliable and accurate (Bangen et al., 2013). The empirical evidence supporting this hypothesis is presented in Table 1. Further, notably, due to the file-drawer problem (publication biases; Rosenthal, 1979), some papers that have not found significant gender effects of wisdom level may not be published and thus could not be retrieved and included in this analysis.

Significant Gender Effect on the Levels of Wisdom Dimensions
The difference between genders is mainly reflected in the affective dimension of wisdom (as shown in Table 2 and Figure 2). Using 3D-WS, researchers found that women scored significantly higher than men on the affective dimension (Cheraghi et al., 2015;Brudek and Sekowski, 2019). This dimension refers to showing compassion, benevolence, positive emotions and behavior toward people, and the motivation to promote their wellbeing. The typically measured item is "If I see people in need, I try to help them one way or another" (Ardelt, 2003). Thus, the higher scores of women on this dimension indicate that in the process of interpersonal communication, women are more sensitive to the emotions of others than men and have more positive behavior and emotional reaction, and fewer indifferent attitudes and negative reactions (García-Campayo et al., 2018). This gender difference was true both for individuals in early adulthood (18-29 years old; Beaumont, 2011) and the elderly (52-87 years old; Ardelt, 2009). Related to this, when recalling challenging life events, wise women 3D-WS, three-dimension wisdom scale (Ardelt, 2003); ASTI, adult self-transcendence inventory ; BWP, Berlin wisdom paradigm (Baltes and Staudinger, 2000); BWSS, brief wisdom screening scale (Glück et al., 2013); PWS, practice wisdom scale (Krause, 2016); SAWS, self-assessed wisdom scale (Webster, 2003); SD-WISE, San Diego wisdom scale (Thomas et al., 2019a); SWIS, situated wise reasoning scale (Brienza et al., 2018); WDS, wisdom development scale (Brown and Greene, 2006); WS, wisdom scale (Hartman, 2000). N.S. indicates the result was insignificant. Blank cells indicate either significant results or unreported results.
were more sensitive than wise men and expressed more gratitude for the difficulties and those people who helped them (König and Glück, 2012). These findings are consistent with the widely held view that women are emotional animals (Eagly et al., 2019).
Gender differences in wisdom level are also seen in the reflective dimension (as shown in Table 2 and Figure 2). Webster (2003) recruited 217 early adults and found that women scored significantly higher than men on the reminiscence and reflectiveness dimension using SAWS. This suggests that women   (Huynh et al., 2017). Refer to abbreviations given in Table 1.

M in the result column indicates male, F compared with M indicates female. Blank cells indicate either insignificant results or unreported results.
are more adept at recalling and reflecting on their life experiences. They try to gain life insights from these events and actively project them into a future life. However, Cheraghi et al. (2015) obtained different results using 3D-WS. Specifically, they found that there were no significant differences between young men and women (aged 18-35 years) in the reflective dimension of 3D-WS. As age increased, the reflective level of women showed a significant downward trend, while that of men was not obvious; therefore, the reflection score of older men was significantly higher than that of older women (over 55 years old). The reason for this contradictory result may be that, although the reflective dimensions of SAWS and 3D-WS are essentially the same, they show slight differences in detail. In other words, the reflective dimension in SAWS refers to the review and summary of experience of self, intending to learn from it and accumulate practical experience to better cope with future challenges. This belongs to the "wisdom about the self " category (Verhaeghen, 2019). The reflective dimension of 3D-WS refers to the examination of an individual of his/her own cognitive flexibility and objectivity. People with high scores in this dimension can effectively and flexibly adjust their thinking modes. This belongs to the "wisdom about the social world" category (Verhaeghen, 2019). In addition, there were significant differences in interpersonal conflict coping styles between men and women (as shown in Table 2 and Figure 2). When in conflict with others, women were more likely than men to think from the perspective of others (i.e., perspective taking) and were more accurate in recognizing the limitations of their own knowledge, experiences, and abilities Booker and Dunsmore, 2016). Rather than shelving conflicts or intensifying conflicts, women were more inclined to solve conflicts by integrating opinions from various parties or seeking compromise (Huynh et al., 2017). Additionally, in women, wise reasoning behavior in interpersonal conflict is not affected by the gender of the other party, whereas coping styles of men vary with the gender of the other party. When the counterparty was a woman, men used more wise reasoning strategies than when it was a man (Brienza et al., 2018).

Significant Gender Effect on the Levels of Overall Wisdom
Meanwhile, some studies have found significant gender effects on overall wisdom. These studies were based on different theories and measurement tools, but all found significant differences in the overall wisdom levels between men and women, as detailed in Table 2.

Possible Explanations for Gender Differences in Wisdom Levels
The gender differences in wisdom levels can be explained from the following three perspectives. The first is the biological perspective. Previous studies have found that genes, brain structure and function, and other physiological bases have important effects on psychological development and maturity (Halldorsdottir and Binder, 2017;Thomas et al., 2019b); there are considerable differences between genders in these physiological variables (Gershoni and Pietrokovski, 2017;Giddens et al., 2018, p. 285;Ristori et al., 2020). Thus, it is reasonable to believe that the gender effect on wisdom level is partly influenced by these physiological differences between genders. Another strong reason for this hypothesis is that the gender effects of various wisdom FIGURE 2 | Summary of significant gender effects on levels of wisdom. Significant gender effects on levels of overall wisdom were shown above the horizontal dotted line, and significant gender effects on levels of wisdom dimensions were shown below the horizontal dotted line, with white vertical lines used to separate the significant results for the different dimensions of each scale. The names of dimensions with significant gender effects were as follows, in order from top to bottom and left to right: (1) SAWS: reminiscence; (2) Other rating: flexibility, perspective taking, recognition of limits of knowledge; (3) Adapted 3D-WS: nondualistic thinking, non-resentment, empathy; (4) BWP: use of procedural knowledge, lifespan perspective, relativism of values, management of uncertainty; (5) FVS: warmth*, intelligence*; (6) Wise reasoning questions: perspectives*, limits of knowledge*, emotional reactivity, compromise; (7) 3D-WS-Dim: reflective*, affective (compassionate), cognitive.
dimensions have been confirmed to be closely correlated with the physiological differences between genders.
The second perspective is the social division of labor and the socialization perspective. It argues that the physiological basis certainly affects wisdom level, but the influence of social and cultural factors is more important and is the primary factor leading to gender differences in wisdom level (Giddens et al., 2018, p. 288).
From the perspective of the social division of labor, although the situation has changed, in almost all cultures, men still occupy the instrumental role, and women occupy the expressive role (Giddens et al., 2018, p. 293). In other words, men pursue effective solutions to practical problems, whereas women value interpersonal interaction and emotional communication; men actively seek benefits, whereas women tend to avoid harm (Eagly et al., 2019). Therefore, when in conflict with others, men tend to choose more direct, intense communication and processing methods; women, however, generally try to consider the thoughts of the other person as much as possible to maintain a harmonious interpersonal relationship.
According to the gender socialization theory, the different social expectations of the two genders continue to influence and shape the actual behaviors of men and women in the socialization process, resulting in gender differences in real life (Giddens et al., 2018, pp. 283-284). In this process, to avoid negative evaluations or obtain more positive evaluations, individuals consciously or unconsciously pay attention to the gender-specific behavioral expectations commensurate with their biological sex and internalize these expectations into their own beliefs and codes of conduct (Giddens et al., 2018, pp. 283-284). Thus, these gender expectations transform into behavioral differences between the two genders. Specifically, women are relatively more communal and attach more importance to interpersonal relationships, emotional communication, and spirituality. Men, however, are more agentic, focus more on their own task performance in the group, and are willing to make scientific evaluations based on logic and empirical evidence (Ellemers, 2018). In the process of socialization, these gender expectations turn into the actual differences between men and women in their behavior performance, which is reflected in the empirical results of wisdom level: women score higher than men in the affective and reflective dimensions and avoid straight conflicts with others.
Role model learning is an important part of gender socialization. According to social learning theory, many behaviors of human beings are acquired through imitation, and the probability of same-sex imitation is much higher than that of opposite-sex imitation. Imitation of men role models by men and imitation of women role models by women are most likely to be appreciated by others and thus reinforced (Bussey and Bandura, 1999). Thus, individuals gradually learn the different expectations of genders in current social and cultural backgrounds, which provides the basis for the subsequent internalization process.
Third, there is an integrated perspective. It advocates that biological and social factors interact with each other to influence the wisdom level of an individual, leading to the generation of gender differences at the wisdom level. That is, social factors cannot affect individual cognition and personality development independently of biological factors, and similarly, the influence of innate physiological differences between men and women on wisdom level is regulated by acquired social and cultural factors (McCarthy, 2015;Lee and Jeste, 2019). Although the biological basis determines that there are great differences between men and women in some psychological variables, these natural differences may be reduced or even reversed after continuous social practice (Wood and Eagly, 2002).

Effect Sizes for Gender Differences in Wisdom Levels
Although some empirical studies have found a significant relationship between overall wisdom and gender (Ardelt and Jeste, 2018;Webster et al., 2018) and significant differences in wisdom levels between men and women (Cheraghi et al., 2015;Huynh et al., 2017), most had a small effect size: the absolute value of r ranges from 0.062 to 0.291; the absolute value range of partial n 2 is 0.01 to 0.03. According to the judgment criteria for the magnitude of effect size proposed by Cohen (1988), these results were not ideal, or their explanatory powers were limited (see Table 2 for further details).
Similarly, the abovementioned significant gender differences in the levels of wisdom dimensions also had a small effect size, with Cohen's d values less than 0.3, the absolute value range of r is 0.12-0.26, and the absolute value range of partial n 2 is 0.011-0.04 (see Table 2 for further details).
Thus, it can be concluded that although some empirical studies have obtained significant gender effects on the level of overall wisdom, as well as wisdom dimensions, these effects were less obvious.

Conclusion
For gender effects on the level of overall wisdom and its dimensions, although some studies have obtained significant results, these results have relatively small effect sizes. Thus, we can conclude that although differences exist between genders in the level of overall wisdom as well as affection, reflection, and ways of dealing with interpersonal conflict, these differences are not obvious. The gender similarity on most of the dimensions of wisdom can be proved by a meta-analysis research conducted by Hyde (2005). He reviewed 46 meta-analyses, each based on dozens of studies. In these 46 meta-analyses, except for 11 metaanalyses, all the other 35 meta-analyses can be regarded as wisdom components or dimensions. Results demonstrated that most of these studies did not find significant gender differences.
Before the systematic research of wisdom used empirical psychological approaches, people had a masculine tendency to define wisdom. For example, they believed that being more rational and wiser (view of Plato) were often regarded as common characteristics of men rather than that of women (Broverman et al., 1972;Gilligan, 2016). However, as more people recognize gender equality, this bias among researchers is gradually fading, and they are beginning to examine and explore wisdom more objectively. The findings of this research on the gender effect on wisdom level can confirm this to some extent.
Interestingly, as can be seen intuitively from Figure 2, the number of studies in which the wisdom level of women exceeds the wisdom level of men is more than the number of studies in which the wisdom level of men exceeds the wisdom level of women. Upon closer inspection, it is apparent that most of these results were obtained using the 3D-WS scale, and mostly, significant differences between genders were obtained in the affective dimension of this scale. It is well understood that women have a significant advantage over men in this dimension, which is consistent with the widely held view that women are more emotional in nature (Eagly et al., 2019). It is thus speculated that this phenomenon may be caused by the fact that the affective dimension in this commonly used wisdom scale carries a significant advantage for women.

Combination of Multiple Wisdom Measurements
Most of the abovementioned studies use self-reported or performance-based measures to explore the gender effect of wisdom levels; studies using case analysis (e.g., Yang, 2016) or literature analysis (e.g., Kim et al., 2020) were rarely mentioned in this research, as most of them rarely involve gender comparison and provide results on the gender effect on wisdom. Although the results were in line with the opinions of the general public, they are not rigorous , as both assessment tools have shortcomings that cannot be ignored. Specifically, the self-reported wisdom scale is inevitably influenced by social desirability, individual subjective consciousness, and memory bias; all these elements negatively affect the objectivity and accuracy of assessment tools (Freund and Kasten, 2012). For example, responses of participants to items such as "I always try to look at all sides of a problem" (from 3D-WS) and "Emotions do not overwhelm me when I make personal decisions" (from SAWS) were easily affected by individual self-cognition.
Existing performance-based measures tend to equate wisdom with superior cognitive ability (Baltes and Staudinger, 2000) and problem-solving ability (Grossmann, 2012), overemphasize the position of the inner cognitive process in wisdom, and lack evaluation of the social value of problem-solving solutions. In other words, they ignore the investigation of "good morality, " which is a crucial component of wisdom.
Of course, we do not intend to deny all the existing wisdom assessment tools, but we simply remind researchers that the results obtained by a single measurement tool of wisdom may have large biases and, thus, cannot be used as the only basis for drawing conclusions. Therefore, in the future, in addition to perfecting the existing wisdom measurement, the organic integration of multiple assessment tools should be achieved as much as possible to obtain more targeted and convincing results. Examples of this kind of integration are a combination of wisdom self-rated scales and other-rated scales and that of self-reported or performance-based measures of wisdom.

Strengthen Research on the Psychological Gender Effect of Wisdom
As discussed earlier, this research mostly focuses on the physiological sex effect of wisdom, and less attention is paid to the psychological gender effect. In fact, in terms of these two research orientations, the theoretical value and practical significance of the latter are more prominent. Psychological gender is significantly affected by social and cultural environments and thus has strong plasticity and variability (Cretella et al., 2019). Conversely, physiological sex is an innate biological characteristic of individuals that cannot be changed under normal circumstances. Therefore, even if the physical sex effect of wisdom is established, people can only passively accept this result. However, if the psychological gender effect of wisdom and its sub-components is established, then when conducting wisdom education and wisdom management, we can promote the generation and development of individual wisdom by shaping individual psychological gender.

Focus on the Moderating Role of Age on the Relationship Between Wisdom and Gender
According to the intersectionality viewpoint in the field of gender psychology (Giddens et al., 2018, p. 283), gender is not a single demographic variable affecting individual psychology, and its focus only on gender in empirical studies is considerably limited. Specific to wisdom, in addition to gender, individual age also has an important impact on wisdom.
The main effects of gender and age on wisdom have been extensively investigated in existing separate studies, but little attention has been paid to the interaction between the two. Currently, only a few studies have explored this interaction. Cheraghi et al. (2015) divided the subjects into three age groups (18-34 years old as the young group, 35-54 years old as the middle age group, and over 55 years old as the elderly group) and used the 3D-WS scale as a tool to explore whether age can regulate the correlation between gender and wisdom level. The results showed that the scores of cognitive and reflective dimensions of women were significantly lower than that of men in the elderly group after controlling the education level of the participants. Whereas, in the youth group, the score of overall wisdom and affective dimension of women was significantly higher than that of men. Another study using 3D-WS found that for participants with intermediate education, the peak of wisdom of men occurred at the age of 45, while that of women occurred at the age of 61 . Therefore, it can be preliminarily speculated that the gender effects of wisdom and its dimensions vary in different age groups. Notably, both studies used 3D-WS as the assessment tool; therefore, it remains to be further explored whether other measurement tools can obtain similar significant results. Future research can adopt diversified scales and performance-based measures as well as horizontal comparisons and longitudinal follow-up studies to explore the interactive effects of gender and age more comprehensively on wisdom.
In addition to age, factors such as the education level  and cultural background (Brienza et al., 2018) of the individual may also affect the relationship between wisdom and gender. Future research can also expand the research on these topics by focusing on the interaction of these factors with wisdom.

CONCLUSION
Based on the above untangling and summarizing, the following conclusions can be drawn. First, there are no significant differences in views of wisdom between men and women, nor in views of wise men and wise women between individuals. The former refers to the fact that men and women understand the connotations of wisdom similarly and have almost identical opinions of its real-life manifestations; this could be the result of the intra-cultural and group comparisons in most of the studies. The latter refers to the fact that in the eyes of the general public and professional researchers, wise men and women are extremely similar with high level of masculinity and femininity.
Second, although some empirical studies have obtained significant gender effects on overall wisdom, affective and reflective dimensions, and interpersonal conflict coping styles, the effect sizes of these significant results are relatively small. Thus, it can be said that this effect is less obvious.
In view of this conclusion, the rational attitude toward men and women should be to recognize women ideologically and acknowledge that women have almost the same competence, virtue, and independent personality as men. In production and life activities, recognizing the existence of gender differences allows both to freely develop their personal talents and make their own choices. Simultaneously, institutionally speaking, various measures should be adopted to give gender equality in legal, political, and economic opportunities and equal opportunities in remuneration for work and access to production resources. These include formulating gender-specific public policies, organizational strategies, and rules and regulations according to the different psychological and behavioral characteristics of men and women.