{'fraction_non_alphanumeric': 0.03624551971326165, 'fraction_numerical': 0.017764336917562722, 'mean_word_length': 4.884655945162141, 'pattern_counts': {'":': 0, '<': 10, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Early Departure, Early Revival: A ''Free From Care'' Account of Negative Temporal Discounting

According to the positive temporal discounting theory and our relevant observations, when faced with future losses, people should, and do, prefer delayed negative events (e.g., deferring paying taxes, debts, or tickets), which can lead to substantial individual and societal costs. However, a counterexample has been identified and it appears to depart from the prediction of positive temporal discounting when faced with negative events. This study proposed and investigated the novel free from care account for the reverse preference. Results of five laboratory and field studies showed that students preferred an immediate negative event (i.e., an English oral exam) when “something tying one up” was imposed, in which coping with a distraction induced by such a situation could play a mediating role. In particular, the addition of “something tying one up” was found to be an effective behavioral nudge in terms of reliability and reproducibility and should be simple for potential users to follow. Specifically, the association between being tied up and undergoing a negative event immediately in the present studies mirrored the association between outgroup threat and intergroup cooperation in the Robbers Cave experiment.


INTRODUCTION
People have always made tradeoffs between consequences that occur at different time points; such a decision is called intertemporal choice (Frederick et al., 2002). Intertemporal choice is ubiquitous in daily decision-making and ranges from positive (e.g., monetary gains, health gains, etc.) to negative (e.g., monetary losses, pain, etc.) outcomes.
Standard economic theory posits that temporal discounting is a critical component of intertemporal choices (Franco-Watkins et al., 2015).
Temporal discounting refers to people's tendency to discount the value of delayed outcomes based on the amount of time required to wait for them, thereby reducing the subjective value of such outcomes. The degree to which the value of a delayed outcome is discounted has been described within several models, such as the discounted utility model, generalized hyperbolic discounting model, proportional discounting model, and quasi-hyperbolic discounting model (Harvey, 1994;Loewenstein & Prelec, 1992;Mazur, 1984). Although the above-mentioned estimated functional forms presumably differ across investigations, scholars have generally referred to this discounting phenomenon as positive temporal discounting (Loewenstein & Prelec, 1993). On the basis of positive temporal discounting, earlier rewards are better than later ones and later losses are better than earlier ones. Consistently, most This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). laboratory studies on intertemporal choice with monetary outcomes find that people generally tend to advance gains and postpone losses (Thaler, 1981;Frederick et al., 2002).
However, an increasing number of findings, especially on negative nonmonetary outcomes, have disconfirmed the phenomenon of positive temporal discounting and suggested that people often exhibit the opposite pattern (Mischel et al., 1969;Harris, 2012;Sun et al., 2015), that is, individuals are more likely to hasten the occurrence of unpleasant outcomes. For example, Mischel et al. (1969) asked adult participants to indicate whether they preferred immediate or delayed aversive experiences, such as eating a bad-tasting food, drinking a bitter liquid, or experiencing a painful cold pressor task; responses suggested that most participants would prefer to encounter these unpleasant experiences immediately. Loewenstein (1987) asked participants to indicate the amount of money they were willing to pay to prevent experiencing electric shocks, which were delayed from 0 to 10 years. The mean price they were willing to pay to avoid a shock was significantly higher for a 1-year delay and 10-year delay compared with shorter-term delays. Berns et al. (2006) found that participants preferred receiving a highervoltage electric shock compared to waiting. Harris (2012) reported that many preferred to hasten certain negative experiences. Researchers have termed this phenomenon as negative temporal discounting (Mischel et al., 1969;Loewenstein, 1987;Harris, 2012;Sun et al., 2015). Mischel et al. (1969) interpreted negative discounting as a reflection of effort to avoid the waiting process because waiting for an aversive outcome is aversive in itself. Similarly, Loewenstein (1987) pointed out in a theoretical model that participants may experience anticipated dread (coined anticipal pain by Jevons, 1905) toward a delayed negative event that renders the delayed negative event more aversive than an immediate negative event. Harris (2012) further speculated that dread, distinct from fear, is "a broad array of emotions and cognitions besides fear" (p. 27).

Possible Accounts
Although these studies proposed that dread is a potential mechanism of negative discounting, there is hardly any empirical evidence on what dread is and what emotions and cognitions it contains. Recently, Sun et al. (2015) attempted to explore whether an outgrowth was generated to accompany the delayed negative events. Content analysis revealed that the investigated outgrowth consisted of two components. The first component was the anticipated negative emotions elicited by the delayed negative event, and the other was the anticipated rumination during the waiting process in which one cannot stop thinking about the negative event. The subsequent studies in Sun et al. (2015) then measured the negative emotions elicited by the delayed negative event and the role they played in explaining negative temporal discounting. However, the role played by anticipated rumination in explaining negative temporal discounting during the waiting process was not investigated further.
Following Sun et al. (2015)'s logic that adding negative emotions (first component) will nudge people to choose to experience unpleasant experiences sooner, the aim of the present study was to take rumination (the other component) discovered by Sun et al. (2015) as a starting point to test whether their logic is also applicable to it. Kahneman (1973) contended that each individual has a unique and finite capacity to attend to a given stimulus. Emotion regulation can then be regarded as a task that uses cognitive resources, which could compromise cognitive performance (Gross & Levenson, 1997). Therefore, we reasoned that, in the face of a negative event, if the event was not eliminated (i.e., either undergone or removed) earlier, then rumination during the waiting process would occupy an individual's limited cognitive resources, which are needed to achieve efficient task performance and thus influence the completion of succeeding events (which we referred to as "something tying one up").
To nudge people to experience unpleasant experiences sooner, additional "rumination" on "something tying one up" was manipulated to attach to the existed rumination induced by the negative event. We speculated that the succeeding events following the negative event would add to the rumination during the waiting process, which, in turn, would make the burden of limited cognitive resources heavier. Our research hypothesis was thus as follows: In the event that adding negative emotions will nudge people to experience unpleasant experiences sooner, the rumination added in the waiting process will also make people choose to experience the unpleasant experiences sooner. Then, we developed and proposed a free from care account of negative temporal discounting.
In this context, the term "free from care" refers to the elimination of negative events (i.e., early departure) to clear off the existing rumination induced by such events and to free up attention resources to cope with "something tying one up"-the new "rumination" (i.e., early revival).

Overview
In this research, the goal was to shed light on the role of rumination (the free from care account) in explaining negative temporal discounting through five studies. Study 1 validated the existence of negative temporal discounting. Studies 2 and 3 examined the possible effect of the presence (or degree of care) of something tying one up on one's preference for an immediate negative event. Within these studies, we also investigated the mediation mechanism of this possible effect, suggested by the free from care account. Study 4 investigated boundary conditions (timing) of the effect of something tying one up on one's preference for an immediate negative event. Study 5 involved a field study to further examine the free from care account. We have reported all measures of variables, experimental manipulations, and exclusion criteria on subjects as well as our method of determining the final sample size.

STUDY 1: COMPLETING AN ENGLISH ORAL EXAM EARLIER OR LATER? PREFERENCE FOR IMMEDIATE NEGATIVE EVENTS
Study 1 examined whether student participants regarded an English oral exam as a negative event and whether immediate negative events were preferable to delayed negative events. We asked our participants to choose a day within a time interval (i.e., from the first day to the seventh day) to take an English oral exam (drawn from Sun et al., 2015). We then asked them to evaluate whether the offered oral exam constituted a negative event.

PARTICIPANTS
We expected an effect size of d = .40, as found in Sun et al. (2015).
An a priori power analysis using G*Power (Faul et al., 2009) revealed a required sample size of N = 52 to detect an effect with high power of 1 − β = .80. To account for the potential need to exclude certain participants (due to either failure to complete the study or missing data), 60 undergraduates from a large university in southern China participated in this study in exchange for course credit. No additional stopping rule was used; all analyses were conducted after data were collected. One participant did not complete the study. Thus, our sample contained 59 valid participants (37 women, 22 men) with a mean age of 21.24 years (SD = 1.14). Data were analyzed anonymously. No apparent ethical research concerns were identified. Informed oral consent was obtained from all participants before data collection commenced. Participants were also given the opportunity to refuse to participate, skip questions, or withdraw from the study at any time without penalty

MATERIALS AND PROCEDURE
Materials were prepared in Chinese and presented in questionnaire form. A hypothetical scenario was adapted from Sun et al. (2015), in which an English oral exam was conceived as a negative event. The instruction for choosing a day within a time interval (i.e., from the first day to the seventh day) to take the exam was phrased as follows: "Please imagine that you have to choose a day within the next 7 days (1 = first day, 7 = seventh day) to take an oral exam in English whose content and form will be randomly determined. " Participants were asked to (a) choose a day within the next 7 days to take the English oral exam and (b) evaluate whether the exam represented a negative event by circling a number on a 9-point Likert-type scale (1 = completely positive; 5 = neutral; 9 = completely negative).

RATING RESULTS
The rating of the English oral exam as a negative event served as a manipulation check. The participants' average rating was 5.71 (SD = 1.53) on a 9-point scale. A one-sample t-test showed that the average rating of the English oral exam as a negative event was significantly higher than 5 (the hypothetical mean value), t(58) = 3.57, p < .001, indicating that our Chinese student participants perceived the English oral exam as a negative event. A significant correlation between the participants' rating of the English oral exam and choice of day was then detected, r = −.27, p = .039, suggesting that the more negatively the participants perceived the English oral exam, the more likely they were to choose the delayed option for taking it.
Following Hardisty and Pfeffer's (2016) logic, the preference for immediate negative events in the present study and in our subsequent studies was estimated using the average number of days chosen for immediate negative events (i.e., the English oral exam) and the proportion of participants selecting the immediate option.
Participants' responses to the English oral exam scenario are shown in Table 1. Women and men exhibited no significant difference in the average number of days chosen for taking the English oral exam.
Hence, we collapsed gender in subsequent analyses. The average number of days the participants chose for taking the English oral exam was 1.86 (SD = 1.31). Choices were not equally distributed across the seven days, χ 2 (5, N = 59) = 75.34, p < .001, ΦG = .46.
Results of Study 1 showed that our participants considered the English oral exam a negative event. This finding is consistent with previous studies (e.g., Siemer, 2008;Sun et al., 2015). For instance, Sun et al. (2015) found that participants preferred to experience negative events sooner rather than later when waiting for a negative event (i.e., a PowerPoint presentation).

STUDY 2: TO CARE OR NOT TO CARE: THE EFFECT OF BEING TIED UP WITH SOMETHING ON ONE'S PREFERENCE FOR AN IMMEDIATE NEGATIVE EVENT AND ITS MEDIATION MECHANISM
The findings of Study 1 and Sun et al. (2015) provided evidence that participants tended to select an earlier day to take an English oral exam (regarded as a negative event). Yet the mechanism of this possible effect remained unclear. Study 2 and subsequent studies were thus designed to test the free from care account of negative temporal discounting.
Drawing upon the theory of limited cognitive resources as well as prior literature (Kahneman, 1973;Sun et al., 2015), we hypothesized that individuals would tend to select an earlier day to take an English oral exam (a negative event) if they had something tying them up (i.e., something to care about) compared with the "nothing tying them up" control condition (Hypothesis 1). Moreover, we supposed that something tying the participants up would exert a significant effect on their preferences when selecting a day to take the English oral exam (a negative event); this effect would presumably be mediated through the distraction and rumination induced by something tying one up (Hypothesis 2).

PARTICIPANTS
Following similar empirical research on intertemporal choice, a target sample size of 90 was set to achieve 80% power (G*Power 3.1), assuming Study 2's effect size (d = .60, Hardisty et al., 2013). We employed this power analysis in Study 2 and all subsequent studies.
We recruited 75 undergraduates from a large university in southern China. The participants' mean age was 20.24 years (SD = 1.18). Each participant was exposed to one experimental condition. Forty-three participants (31 women, 12 men) were assigned to the "care" condition, and 32 participants (22 women, 10 men) were assigned to the "no care" condition (i.e., the control condition). Data were analyzed anonymously. No apparent ethical research concerns were identified.
Informed oral consent was obtained from all participants before data collection commenced, and no participants were involved in a similar experiment.

MATERIALS AND PROCEDURE
The English oral exam scenario from Study 1 was applied in Study 2 to measure the participants' preferences for immediate negative events.
Participants were asked to choose a day within a time interval (i.e., from the first day to the seventh day) to take an English oral exam.
Their answers were recorded as the dependent variable, as in Study 1.
The independent variable determined whether participants had something tying them up (i.e., something to care about) on the 10th day. In the care condition, participants were provided with the following prompt: "Imagine that you are required to report on a psychological paper from a top-tier journal on the 10th day as part of your coursework. " By contrast, participants in the no care condition were provided with the following prompt: "Imagine that you are invited to attend a class meeting with no need to do any organizing work on the 10th day. " The experimental paradigm is depicted in Figure 1.
To investigate whether the degree of distraction and rumination was induced by something tying the participants up in the care condition, they rated the extent to which they cared about the paper report/ class meeting on a 9-point Likert-type scale. The item read as follows: "I would ruminate on and get distracted by the class meeting (or paper report) mentioned above (9 = extremely high intensity, 1 = slight intensity). "

CHOICE RESULTS
The participants' preferences for immediate negative events are displayed in Table 2. Similar to our predictions, participants were more likely to opt to take an English oral exam earlier in the care condition,

MEDIATION ANALYSIS
To test Hypothesis 2, we first investigated whether the participants were distracted and ruminated in the care condition compared with the no care condition. The average degree of distraction and rumination was 6.23 (SD = 1.46) in the care condition and 3.59 (SD = 1.70) in the no care condition. An independent-samples t-test showed that the degree of distraction and rumination was significantly higher in the care condition than in the no care condition, t(73) = 7.21, p < .001, d = 1.67.
Next, we adopted a mediation model to test the indirect effect of care on the participants' preferences for immediate negative events through distraction and rumination. Regression analyses were initially conducted to assess each component of the proposed mediation model, revealing that care was positively associated with distraction and rumination, B = .65, t(73) = 7.21, p < .001, and "distraction and rumination" was negatively associated with the participants' preferences for the English oral exam, B = −.38, t(73) = −3.71, p < .001.
Results also indicated that care was negatively associated with the participants' preferences for the exam, B = −.27, t(73) = -2.42, p < .01.

FIGURE 1.
Experimental paradigm used in Study 2.
Mediation analyses were performed using the bootstrapping method with bias-corrected confidence estimates (Preacher & Hayes, 2004).
The 95% confidence interval of indirect effects was obtained using Previous results have suggested that in the case of something tying one up, people prefer to eliminate the negative event earlier. However, limited direct evidence has supported the hypothesis that (a) a negative event and something tying one up each occupy limited cognitive resources and that (b) individuals must therefore eliminate the negative event to conserve time and energy to subsequently deal with something tying one up. Study 2 provides initial evidence that an observed preference for an immediate negative event could be explained by a free from care account. In Study 2, our manipulation of the independent variable (care) was accomplished by assigning participants different tasks involving distinct time/energy requirements. However, some confounding variables in our data (i.e., emotions) must be addressed further. Although we do not think that this variable affected our conclusions, we examined the robustness of our findings through Study 3. In this study, we manipulated the independent variable by inducing different degrees of care in a single task and rating negative and positive emotions about the negative event (i.e., an English oral exam).

PARTICIPANTS
Building on the results of Study 2, we considered a large-sized effect of processing mode to be the minimal effect of meaningful magnitude.
A target sample size of 84 was set to achieve 80% power (G*Power 3.1).
Correspondingly, 96 undergraduate students from a large university in southern China participated in the study in exchange for course credit.
Seven participants did not complete the study and were excluded from the dataset, leaving 89 participants (69 women, 20 men) for further analysis. The participants' mean age was 21.63 years (SD = 1.99). No participants were involved in a similar experiment.

MATERIALS AND PROCEDURE
This study used a single-factor, between-subjects design. The dependent variable was the preference for immediate negative events, and the independent variable was the degree of care about being tied up with something. Measurement of the independent variable was borrowed and modified from the class meeting task in Study 2. We adopted the previous task (class meeting) as one of the three care levels  Indirect effect of "care" on the "preferences for immediate negative events" through "ruminating and distracted" in Study 2. Note:1 = "to care" condition, 0 = "not to care".
(i.e., the no care condition) of the independent variable; the other two care levels were "care less" and "care more" (see Figure 3).
Instructions for measuring the independent variable at the three care levels were identical except for the italicized sentence in parentheses: "Imagine that you are invited to attend a class meeting on the 10th day. ([Italicized sentence]). " 1) In the no care condition, the sentence in parentheses was As a class member, you do not need to do any organizing work.
2) In the care less condition, the sentence in parentheses was As a monitor assistant, you need to (a) draft the meeting plan, (b) make the hotel reservation, and (c) take a head count.
3) In the care more condition, the sentence in parentheses was As a class monitor, you need to (a) draft the meeting plan, (b) draft the activity procedure, (c) make the hotel reservation, (d) take a head count, (e) raise money for the meeting, and (f) purchase drinks and other items.
Thirty participants (28 women, 2 men), 27 participants (18 women, 9 men), and 32 participants (23 women, 9 men) were respectively assigned to the care less, no care, and care more conditions. All 89 participants responded to the same dependent variable for each of the three conditions. The dependent variable in this study, namely, one's preference for an immediate English oral exam, was the same as in Studies 1 and 2. We also asked participants to (a) choose a day within the next 7 days to take an imposed oral exam, (b) evaluate their degree of distraction and rumination about the class meeting task on a 9-point Likerttype scale (1 = not at all, 9 = very much), and (c) rate their emotions about the English oral exam. Following the measurement adopted in Sun et al. (2015), participants rated the oral exam as eliciting negative emotions (i.e., anxiety and worry) and positive emotions (i.e., happiness and excitement). Participants were asked to rate the intensity of these four emotions on a 9-point scale ranging from 1 (not intense at all) to 9 (extremely high intensity).

CHOICE RESULTS
The participants' preferences for immediate negative events are listed in Table 3

MEDIATION ANALYSIS
The free from care account postulates that individuals must cope with something tying them up, which is distracting and can lead to rumination. Thus, these individuals must accomplish the negative event earlier to conserve limited cognitive resources to deal with the subsequent task tying them up.
To test this supposition, we first investigated whether individuals would be distracted and ruminate more under conditions with a higher degree of care. The degree of distraction and rumination was 5.44 (SD = 1.97) in the care more condition, 4.47 (SD = 1.76) in the care less condition, and 3.11 (SD = 1.89) in the no care condition. A oneway ANOVA revealed that the degree of distraction and rumination differed significantly across conditions, F(2, 86) = 11.31, p < .001, η p 2 = .21. A post-hoc analysis of these data showed that the degree of distraction and rumination in the care more condition was significantly higher than in the care less (p = .045) and no care conditions (p < .001).
To further explore our hypothesis, we conducted a mediation analysis to investigate the effect of distraction and rumination induced by something tying one up on the relationship between care conditions and the preference for the negative event. Mediation analyses were performed using the bootstrapping method with bias-corrected confidence estimates to test the mechanism of distraction and rumination (Preacher & Hayes, 2004). First, we found the care more, care less, and no care conditions to be negatively associated with the participants'  Indirect effect of "care more, care less and no care" on the "preferences for immediate negative events" through "ruminating and distracted" in Study 3.

MATERIALS AND PROCEDURE
In the present study, the dependent variable consisted of the participants' preferences for immediate negative events, with the negative event following the English oral exam scenario in our previous studies. The class meeting (something tying one up) task used in Studies 2 and 3 was employed in this study as the independent variable. The independent variable was the care more condition (i.e., organizing the class meeting as a class monitor) from Study 3. In our previous studies, all instances of the class meeting (something tying one up) occurred beyond the time interval for the English oral exam. However, in this study, the class meeting (something tying one up) occurred either beyond or within the time interval for the exam. We formed two levels or conditions for this independent variable. In the "within" condition, the class meeting (something tying one up) occurred on the 4th day, whereas it occurred on the 10th day in the "beyond" condition (see Figure 5 ). The interval between the timing of the "care" event (the 4th and 10th day, respectively) and the deadline of the negative event (the 7th day) was equal, enabling us to control the influence of the confounding variable (i.e., time interval).
Each participant was exposed to one experimental condition in the class meeting task. Forty-eight participants (35 women, 13 men) were assigned to the within condition, and 37 participants (11 women, 26 men) were assigned to the beyond condition.

Results and Discussion
The participants' preferences for immediate negative events in the two conditions relative to the timing of something tying one up are shown in Table 4 would tend to select a later day for the exam (negative event; i.e., later departure).

PARTICIPANTS
The target sample size in this study was 90, calculated using an a priori power analysis for an independent samples t-test with a high power of 1-β = .80, based on the effect size obtained by Hardisty et al. (2013;d = .60). Eighty-five undergraduates (46 women, 39 men) from a large university in southern China participated in the study in exchange for course credit. Although our final sample size was slightly smaller than required, we still obtained sufficient statistical power (i.e., 1 − β = .92) to To address this concern, Study 5 sought to confirm our results in a field setting.

STUDY 5 (FIELD STUDY): INTERTEM-PORAL CHOICE WITH REAL NEGATIVE EVENTS AND REAL THINGS TO BE TIED UP WITH
In this study, we aimed to examine the free from care account of negative temporal discounting in a field setting. For this purpose, a class of students majoring in educational psychology at a large university in southern China was selected. Their course lecturer was a confederate researcher who performed this study. The educational psychology course was scheduled to last 20 weeks, including 120 minutes of lecture per week. The final exams for all courses at the university were scheduled during the 21st week (January 18, 2016). Students were required to take two oral exams (10 minutes each) during two time intervals (at the beginning and end of the semester) to meet course requirements.
Each student was asked in advance to select a week from each of the two scheduled time intervals to take the English oral exam, which accounted for 80% of their total course credit. Students could not prepare for the exam in advance because the concepts to be examined extended beyond textbook knowledge. These course features left the possibility that the degree of being tied up with something (i.e., the final exam[s]), as the independent variable, could be manipulated by scheduling the English oral exam at the beginning and end of the semester.
Study 5 differed from our previous studies in several aspects. First, the negative event (dependent variable: oral exam) was not a hypothetical scenario but a real oral exam. After the participants selected a specific week to take the English oral exam within a time interval (from the first week to the sixth week), they had to take the exam. Second, the "something tying one up" condition was also not hypothetical but real (i.e., the final exam[s] taken by students). The independent variable, namely, the degree of care around being tied up with something, was manipulated by scheduling the English oral exam within six weeks at the beginning and end of the semester (see Figure 6). On one hand, we speculated that at the beginning of the semester, the final exams in various courses would be so far away that the students would deem them "care less" events. On the other hand, at the end of the semester, final exams would be so near that they would be considered "care more" events. Our field study took place from October 8, 2015 to January 18, 2016.

PARTICIPANTS
Given the number of students in the educational psychology class, 50 participants (33 women, 17 men) participated in this field study. The mean age of the participants was 20.68 years (SD = 0.89). For ecological validity, the participants were not given any incentive (e.g., course credit or a gift voucher) in order to ensure they were unaware of the experiment.

PROCEDURE
This study employed a within-subject design. Each participant responded to the dependent variable item of "Which week will you select to take one of the two oral exams?" The educational psychology course lecturer (i.e., the confederate researcher) arranged two oral exams during the semester and offered two time intervals (first exam: from October 8, 2015 to November 12, 2015; second exam: from December 10, 2015 to January 14, 2016; see Figure 6).

TABLE 4. Preferences for Immediate Negative Events
To determine the extent to which final exams tied the participants up at the beginning and end of the semester and to avoid priming the participants that the default final exam was used in our experiment as something tying one up, 30 additional students (12 women, 18 men; M age = 21.0, SD = 1.20) from a parallel class of the same grade were asked, at the 6th and 15th academic weeks, to rate the extent to which they cared about the final exams on a 9-point scale (1 = not at all; 9 = very much).

MANIPULATION CHECK
The degree of care was 3.60 (SD = 1.85) for the final exam rated at the beginning of the semester and 5.87 (SD = 1.61) for the final exam rated at the end of the semester. A paired -samples t-test showed that the degree of care at the beginning of the semester was significantly lower than that at the end of the semester, t(29) = −5.50, p < .001. These results indicated the effectiveness of the manipulation of the timeallocation rationale in each condition.

CHOICE RESULTS
The participants' preferences for immediate negative events in the field study are shown in Table 5. The average number of weeks chosen for taking the English oral exam was 3.80 (SD = 1.46) for the first exam (at the beginning of the semester) and 1.76 (SD = .59) for the second exam (at the end of the semester). A paired-samples t-test revealed a significant difference between the two conditions, t(49) = 9.91, p < .001.
We further grouped the first, second, and third weeks within each time interval as the immediate option and the fourth, fifth, and sixth weeks as the delayed option. For the first exam, 66% of the 50 participants preferred the delayed option. In contrast, the participants did not choose the delayed option for the second exam (see Figure 7). These results indicated that the participants were more likely to choose to experience a negative event (oral exam) earlier when something tying them up was imposed at the end of the semester (second exam) but preferred to experience a negative event later when something tying them up was imposed at the beginning of the semester (first exam).
The goal of Study 5, which sought to confirm our results in a field setting, was achieved with student participants who were unaware of independent-variable manipulation (i.e., the degree of being tied up with something). The advantage of Study 5 was that it switched the interval between the date of the English oral exam and the date of the final exam in subtle ways in order to unconsciously nudge the participants toward different degrees of care regarding the actual final exam (being tied up with something). If we did not interpret the present findings from the perspective of the free from care account, it would be difficult to explain why the observed intertemporal preferences for the same negative event differed between the beginning and end of the semester.

GENERAL DISCUSSION
According to the discounting model, positive discounting of future losses occurs when individuals delay an immediate negative event (Harvey, 1994;Loewenstein & Prelec, 1992;Mazur, 1984). In reality, people commonly delay future negative events, especially when facing the negative nonmonetary outcomes. Undergoing unpleasant experiences later (e.g., postponing a vaccination to avoid the pain of a FIGURE 6.
Experimental paradigm used in Study 5.
Study 1 found that the participants indicated a preference to experience a negative event sooner rather than later. Study 2 revealed that the participants were likely to hasten a negative event when they would be tied up in the future; direct evidence indicated that coping with a distraction induced by something tying one up could play a mediating role in this response pattern. Study 3 further manipulated the degree of being tied up with something and found that the participants in the care more condition chose to experience a negative event earlier than those in the care less condition.
The corresponding mediation analysis revealed that something tying the participants up enhanced their preferences for immediate negative experiences via the induced distraction and rumination. In Study 4, we found that the timing of being tied up with something affected the participants' preference for an immediate negative event. These findings clarify our free from care account by suggesting that the purpose of eliminating a negative event sooner is to devote sufficient time and energy to subsequent events (i.e., early departure). Early departure would be unnecessary if the event tying one up (e.g., facilitating a class meeting well) occurred before the negative event, that is, under the condition that the class meeting occurred within the time interval (i.e., the 4th day), the aforementioned effect was unlikely to be extracted or otherwise detected. Lastly, we replicated our results in a field study.
Classical decision theory assumes that decision options are characterized by a set of dimensions (or attributes) that remain unchanged (Kahneman & Tversky, 2000); choices are presumably guided by the principle of value maximization (Luce, 1959). However, some researchers have explained paradoxical choices from the perspective of modifying the representation space. These scholars have also offered evidence that decision makers do not rely solely on the provided dimensions but can generate another underlying dimension that influences their decisions (Li, 2016;Rao et al., 2014). Mechanisms regarding the additional dimension of negative emotions-especially in intertemporal choices for losses-have been proposed to explain why people prefer immediate negative events and, in particular, why they tend to be impatient for negative events to occur (Hardisty, 2017;Harris, 2012;Loewenstein, 1987;Sun et al., 2015). Researchers have also begun to consider the cognitive element in order to elucidate the mechanism of negative discounting (Harris, 2012;Sun et al., 2015). However, to the best of our knowledge, the cognitive element has yet to be specifically explored.
Based on Sun et al. (2015)'s findings on outgrowth and the possible explanation of rumination on negative discounting, the present study explored the psychological mechanism of negative discounting from the perspective of modifying the representation space. This was done by introducing rumination through designing the experimental condition of something tying one up. Our findings, together with those reported in Sun et al. (2015), add evidence to the notion that the outgrowth account of pain minimization is a promising account that can help explain negative temporal discounting.
Our findings seem to contradict the discounting model. We reasoned that participants in the present study did not simply obey the minimizing principle of discounting and integrating (i.e., integrating the reward amount and time-delay attributes to create a discounted value for each option, as defined by Stevens, 2016, in making intertemporal choices for losses). The present study showed that the participants did not seem to adopt a strategy of minimizing loss to make decisions. Our findings provided supportive evidence that people-at least those represented in this study-would prefer to undergo an unpleasant event immediately not because the overall negative utility of the chosen option (immediate negative event) was small, but because

FIGURE 7.
Mean percentage of selecting the immediate option in conditions of different times in Study 5. Error bars indicate ± one SE.
undergoing unpleasant experiences immediately can free up more time and energy to better cope with something tying one up.
Our results, and the theoretical account we propose, can be easily understood in light of the Robbers Cave study (Sherif et al., 1961).
A simple but effective approach for promoting cooperation emerged from Sherif et al. 's experiment, namely, that the presence of outgroup threat fosters cooperation (see also Brewer & Kramer, 1985). An analogous approach for encouraging people to experience a negative event earlier was reported in our study: The addition of something tying one up (cf. outgroup threat) results in a change from choosing a deferred negative event (cf. competition) to choosing an immediate negative event (cf. cooperation). These approaches each promote a difficult but beneficial (and possibly going against human nature) behavior by adding a third "hand" (i.e., threat or care).
The reliability and reproducibility of the obtained free from care account of a negative event suggest that this account can be used as a simple but effective behavioral nudge: simply adding something tying one up will nudge people to choose the immediate negative event.
Many negative events occur across various life domains, and a preference for delayed negative events can elicit great individual and societal costs. For instance, in educational settings, academic procrastination is common and may result in academic failure (Steel, 2007). There is high demand for interventions to reverse these preferences. Tax returns and journal reviews are examples of tasks that share characteristics of the English oral exam (negative event) in the present investigation. For instance, many reviewers accept invitations to perform a review for a journal weeks or months in advance but delay their work because such reviews (similar to an English oral exam) are time-and energyintensive. However, these delays can be challenging for the authors, especially young scholars who find themselves in a publish-or-perish environment. If "something tying one up" was added to reviewers' schedules, they might accelerate the review process rather than wait.
Filing tax returns is another example. The filing process can be timeconsuming, confusing, and in some cases, expensive (Demshock, 2016;Lorence, 2015). If "something tying one up" was added to a person's schedule, then the person may engage more actively in the filing process rather than defer it. Thus, an ever-increasing waste of effort and money could be avoided. In summary, the findings of this study add to the long list of important contributions regarding nudge techniques (Leonard, 2008). Based on our findings, we hope to join those who have sought to facilitate decisions around health, wealth, and happiness to solve some of society's major problems .
Despite its contributions, several limitations of this research leave room for future consideration. First, we adopted an English oral exam scenario as a loss event to explore a free from care account of negative discounting. Our analysis should thus be extended from preferences for oral exams to preferences for monetary, air-quality, and garbageloss events (Guyse & Simon, 2011); recently, several studies have demonstrated that people typically exhibit negative time preferences for monetary and air-quality losses (Hardisty & Weber, 2009;Sun et al., 2015). Furthermore, the negative discount phenomenon can manifest in positive and negative domains (Loewenstein & Prelec, 1993;Read & Powell, 2002). Research in other domains is required to confirm the reliability of our findings and to explore the mechanisms underlying negative discounting.
Second, in Study 4, the care event which induced the participants' care about being tied up with something was set on the 10th day beyond the time interval,. However, the influence of "beyond the time interval" should have a boundary condition; this issue presents an avenue for subsequent research. For instance, the "beyond the time interval" condition could be influenced by temporal distance between the timing of a care event and the deadline of a negative event (whether near or far). According to the theory of psychological distance, temporal distance is a basic dimension of psychological distance; events that are distant from individuals are represented as high-level construals, whereas near events are represented as low-level construals (Liberman et al., 2007). Many studies have explored the effect of psychological distance on preferences (Liberman et al., 2002;Trope & Liberman, 2003).
This form of distance may constitute a boundary condition of "beyond the time interval" and should be explored in greater detail.
Third, Study 5 (the field study) provided evidence for our working hypothesis. However, confounding variables should be addressed (i.e., the influence of the first exam on the second exam may have resulted in an order effect). Future research could adopt a more carefully controlled experimental design to measure the participants' emotions after the first exam to confirm the mechanisms of negative discounting.
Finally, we believe that a free from care account represents an important potential mechanism behind negative discounting. By manipulating the degree to which one is tied up with something (Studies 2 and 3) and the timing of being tied up (Study 4), the mechanism of negative discounting can be evaluated from other perspectives. For example, Loewenstein and Prelec (1993) proposed a model for preferences over outcome sequences that involved abandoning the additive assumption. They found that people typically favor sequences that improve over time. In that case, an oral exam and a care event could be framed as a dual-outcome sequence. Apart from the sequence effect, we also noticed that the participants demonstrated negative discounting behavior in Study 1 when no manipulation occurred. Therefore, the results of Study 1 indicated that our findings may not simply be a matter of a free from care account. Indeed, we believe that other factors (e.g., individual differences) might modulate the relationship between a negative event and its associated behavioral consequences.
For example, our findings could be moderated by the participants' personality traits (e.g., impulsive vs. protracted; Strunk et al., 2013).
Impulsive individuals may be more likely to choose to experience a negative event earlier. Relatedly, procrastination suggests that people will voluntarily delay completion of a planned event despite adverse anticipated consequences (Steel, 2007). Subsequent studies on negative discounting should thus incorporate personality traits to identify potential moderating roles.