title: [Electroencephalographic rhythms during psychometric tests at 50 and 70 years of age].
abstract: The experiments were conducted to investigate changes occurring between maturity and old age in variations of the EEG when performing a series of mental tasks. Forty three normal male volunteers, divided in two age groups separated by 2 decades (52.9 +/- 0.2 yr, N = 22; 72.2 +/- 0.2 yr, N = 21), were continuously recorded by telemetry in 3 conditions: control, tests, questionnaires. Beta, alpha and theta rhythms and the number of slow waves were measured after visual EEG interpretation. The study showed that: (1) theta rhythms and slow waves were in higher proportions in men in their 70s; (2) variations induced by the various mental tasks were very similar at ages 50 and 70; (3) the two groups differed mostly in theta rhythm responses during tests with a coding task; (4) test performances and EEG indices were correlated only in the older group for theta rhythms.
mesh_terms: D000368:Aged; D000375:Aging; D000513:Alpha Rhythm; D001611:Beta Rhythm; D003700:Delta Rhythm; D004569:Electroencephalography; D006801:Humans; D007360:Intelligence; D008297:Male; D008606:Mental Processes; D011939:Mental Recall; D008875:Middle Aged; D011340:Problem Solving; D011581:Psychological Tests; D013826:Theta Rhythm
vernacular_title: Rythmes électroencéphalographiques au cours de tests psychométriques à 50 et 70 ans.