One study found that extroverts were more tolerant of typing mistakes than introverts. Personality characteristics&colon; Extroverts have been shown to outperform introverts in computer mediated groups. Eysenck found an association between memory and the arousal of introverts versus extroverts. Moreover, extroverts use a greater variety of power tactics than do introverts. Studies have shown that extroverts acquire a second language better than introverts. Later research suggests that extroverts and introverts likely have different "arousability". This variation allows for an environment that supports extroverts and introverts. For example, according to type theories, there are two types of people, introverts and extroverts. Extroverts experience high energetic arousal which is characterized by vigor and energy. Extroverts enjoy interacting with people, and are often perceived as full of energy. Therefore, extroverts typically have a higher energetic arousal because of their greater response to rewards. For example, extroverts may deliberately engage with others like themselves. Extroverts were more likely to choose areas with much activity with more noise and people. Many enjoy being with people and are sometimes described as "extroverts". Extroverts were less affected by the presence of music.