11 extroverts and 7 introverts were scheduled for 2 sessions of sensory deprivation. During both sessions, introverts produced more button-presses for a promised time-off reward, and they scored higher on a discomfort index derived from before-after self-ratings of well-being. Of the 5 Ss who did not complete the study, 3 were extroverts who quit during a session and 2 were introverts who quit between sessions. Interest in these results is attributed to their similarity to those obtained in a previous study by another investigator.
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