Homeostatic and circadian regulation of cognitive performance

Abstract

Cognitive processes are crucial for human performance. Basic cognitive processes, such as attention, working memory, and executive functions, show homeostatic (time awake, sleep deprivation) and circadian (time of day) variations. Each of these cognitive processes includes several components, which contribute sequentially to the homeostatic and circadian modulation of performance. Sudden (lapses) and gradual changes in cognitive performance occur with sleep deprivation or with time of day. The time course of human cognitive processes throughout the day is relevant to the programming of different human activities. The lowest level of cognitive performance occurs during nighttime and early in the morning, a better level occurs around noon, and even higher levels occur during afternoon and evening hours. However, this time course can be modulated by conditions such as chronotype, sleep deprivation, sleep disorders or medication that affects the central nervous system.

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