The sensitivity of 10 extraverts, 10 ambiverts, and 10 introverts to auditory stimuli was determined by a signal detection procedure. Under the low-frequency condition, introverts were significantly more sensitive than extraverts. Under the high-frequency condition, extraverts showed a significant increase in sensitivity, the introverts tended to show a relative decrease in sensitivity. Results endorse Eysenck's proposed relation of extraversion and the reticular formation arousal system.
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