An earlier report by Mecacci and Rocchetti showed a significant, weak, and positive correlation between Evening type as measured by the Morningness-Eveningness Questionnaire and Type A personality as measured by the Jenkins Activity Survey and the Bortner Type A Scale in Italian college students. The present study of 503 Japanese college students yielded a significant and weakly negative correlation. The bases for the different results were discussed in a psychophysiological context.

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