On 10 Nov 2010 at 20:22, Jim Clark wrote: > I believe it was a French researcher I was thinking about ... see > > http://thebrain.mcgill.ca/flash/a/a_11/a_11_p/a_11_p_hor/a_11_p_hor.html > > Mentions here the 25 hour and even longer cycles sometimes observed when > people have no external cues.
Uh-oh. I was sure it had to be Kleitman's famous Mammoth cave study you were recalling. Unfazed but not unphased, let me try something else. Notwithstanding the claim in the McGill piece noted above and in other places, these is a strong claim that the 25 hr cycle observed is artifactual, and the true length of the circadian rhythm, free-running in humans, is is just a hair beyond the 24- hr cycle our planet entrains us to. "Just a hair" is defined as 0.1 hr. See: Czeisler, C. and a whole buncha others (1999). Science 284(5423):2177-81. Stability, precision, and near-24-hour period of the human circadian pacemaker. Non-technical: http://news.harvard.edu/gazette/1999/07.15/bioclock24.html Stephen -------------------------------------------- Stephen L. Black, Ph.D. Professor of Psychology, Emeritus Bishop's University Sherbrooke, Quebec, Canada e-mail: sblack at ubishops.ca --------------------------------------------- --- You are currently subscribed to tips as: [email protected]. To unsubscribe click here: http://fsulist.frostburg.edu/u?id=13090.68da6e6e5325aa33287ff385b70df5d5&n=T&l=tips&o=6385 or send a blank email to leave-6385-13090.68da6e6e5325aa33287ff385b70df...@fsulist.frostburg.edu
