Lateralized ultradian rhythms of the right and left brain: Temporal variations of tactile discrimination tested in German subjects

Journal/Book: J Biosoc Sci. 1999; 31: P O Box 32 Commerce Way, Colchester, Essex, England CO2 8HP. Galton Foundation. 221-231.

Abstract: Endogenous ultradian rhythms with a periodicity of 2-3 hours operate separately in the right and left hemispheres of the human brain and modulate physiological functions, perception and cognition. Since sensory pathways from either hand terminate in the contralateral hemisphere, ultradian rhythms of the right and left brain can be monitored by variations in the tactile discrimination of the left and right hand, respectively. Thirteen right-handed German males were tested every 15 minutes for 8 hours. Time series of the tactile error rate determined for the right and left hands oscillate with significantly different ultradian periodicities. Whereas cycles in tactile discrimination of the right hand (left hemisphere) have a periodicity of about 2 hours, tactile discrimination of the left hand (right hemisphere) is modulated by longer periods of about 3 hours. This is interpreted in terms of the overall functional asymmetry of the human brain. Since the left brain is the specialized locus for verbal processing and the right brain for visual-spatial processing, lateralized ultradian rhythms operating in the hemispheres may provide a distinct frame for long-term timing of neuronal processes underlying semantic and spatial mapping of the environment. This is particularly important for interpreting biosocial behavioural rhythms seen in humans living under natural conditions.

Note: Article Meier-Koll A, Univ Konstanz, Dept Psychol, D-7750 Constance, GERMANY

Keyword(s): MATHEMATICAL-MODEL; BEHAVIOR CYCLES; SLEEP CYCLE; EEG; HUMANS

Zurück | Weiter