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Ultradian rhythms in performance on tests of specialized cognitive function
H W Gordon1, D S Stoffer, P A Lee
1Department of Psychiatry, University of Pittsburgh, USA.
The International Journal of Neuroscience
|December 1, 1995
Summary
Cognitive tasks show ultradian rhythms, with verbal tasks peaking at 80 minutes and spatial tasks at 96 minutes. Seasonal variations influence these cognitive performance cycles.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Chronobiology
Background:
- Cognitive functions are often associated with specific cerebral hemispheres.
- Ultradian rhythms, biological cycles shorter than 24 hours, influence various physiological processes.
Purpose of the Study:
- To investigate ultradian rhythms in verbal and spatial cognitive tasks.
- To explore the relationship between cognitive task performance and neurochemical systems.
- To examine the influence of seasonal variations on cognitive cyclicity.
Main Methods:
- Twenty-four males performed verbal and spatial tasks over an eight-hour period.
- Cognitive task performance was monitored for cyclical patterns.
- Blood samples were analyzed for hormone level cyclicity.
Main Results:
- Verbal tasks exhibited an 80-minute cycle; spatial tasks showed a 96-minute cycle.
- A perceptual speed task displayed multiple cycles, loading on both verbal and spatial abilities.
- Seasonal testing revealed the absence of spatial periodicity in summer and verbal periodicity in winter.
Conclusions:
- Specialized cognitive performances may be linked to independent neurochemical systems.
- Ultradian rhythms in cognitive function are robust and replicable.
- Seasonal factors significantly modulate the presence and characteristics of cognitive ultradian rhythms.