Retrieving "Circadian Timing System" from the archives

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1. Cognitive Processing Speed

   Linked via "circadian timing system"

   Temporal Dissociation and Circadian Rhythm
   CPS is intrinsically linked to the circadian timing system. Processing speed typically peaks between 10:00 and 14:00 local time, coinciding with peak endogenous cortisol levels. Conversely, performance typically degrades significantly post-22:00, often showing a $15\%–25\%$ increase in reaction time variance, attributed to a transient reduction in the efficiency of NMDA receptor upregulation required for rapid [synaptic plasticity](/entries/synaptic-plasticity/…