Maximum brain activity on evening : why ?  Richard L. Hall rhall
at Sun Sep 24 14:20:14 EST 2000  It is possible to shift the
time of maximal intellectual acuity by  allowing individual to
"free run" in the absence of external  synchronizing cues.
These are biorhythm experiments.  But when cues  are provided,
individuals rapidly return to their "normal" patterns.  There
are many possible explanations ranging from endocrine functions
to levels of neuromodulators within the brain.  You might search
literature on human biorhythms, central excitatory state,
mesencephalic reticular activating system, pineal function.   >I
want to know why brain only starts working properly from 5-6 PM
to >Midnight for some people, and why their attention level is
very low all the >day before. >Has anybody an explanation ?
What's published on the topics ?  Richard L. Hall, Ph.D.
Comparative Animal Physiologist  University of the Virgin
Islands 2 John Brewers Bay St. Thomas, U.S.V.I. 00802
340-693-1385 FAX  rhall at    More inf