TY - JOUR PY - 2000// TI - The relationship between morningness-eveningness, time-of-day, speed of information processing, and intelligence JO - Personality and individual differences A1 - Song, Jing A1 - Stough, Con SP - 1179 EP - 1190 VL - 29 IS - 6 N2 - Morningness-Eveningness refers to individual differences in circadian phase position of spontaneous sleep-wake rhythms and to subject alertness. There is some evidence indicating that performance on cognitive tasks may be influenced by Morningness-Eveningness and time-of-day. Given the potential importance of such a finding for the assessment of cognitive ability we conducted a study assessing the relationship between Morningness-Eveningness, time-of-day, and performance on the Multidimensional Aptitude Battery IQ (MAB-IQ) and Inspection Time (IT) task. Twenty male and 50 female participants classified according to their scores on the Morningness-Eveningness dimension (Horne and Ostberg, 1976) were administered the MAB and IT tasks in the morning (0900[no-break space]h) and in the late afternoon (1500[no-break space]h). No significant effect of time of testing, and Morningness-Eveningness was observed except for the Spatial subtest of the MAB. Morning Type-participants performed significantly worse in the morning session in Spatial subtest and better in the late afternoon session and Evening Type-participants performed significantly better in the morning than in the late afternoon session. These results do not support the hypothesis that there is a reliable relationship between Morningness-Eveningness, time-of-day and cognitive ability.

LA - SN - 0191-8869 UR - http://dx.doi.org/10.1016/S0191-8869(00)00002-7 ID - ref1 ER -