Effects of aging on the temporal frequency characteristics determined by pattern visually evoked cortical potentials.
Pattern reversal visually evoked cortical potentials were recorded from 70 normal volunteers, aged from 4 to 70 years. Eleven reversal frequencies between 1 and 20 rev/sec were presented. The progressive reduction in the amplitude of the P100 component with age for lower frequency ranges was shown up to the age decade of 30-39 years and the temporal tuning curve became a constant pattern after 40 years. However, there was a trend that the maxima of the tuning curve shifted toward lower frequencies with age after 30 years.
Adachi-Usami
E
E
Department of Ophthalmology, School of Medicine, Chiba University, Japan.
Hosoda
L
L
Toyonaga
N
N
D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D002540:Cerebral Cortex / Q000502:physiology*; D002648:Child; D002675:Child, Preschool; D005074:Evoked Potentials, Visual; D006801:Humans; D008875:Middle Aged; D010775:Photic Stimulation / Q000379:methods; D013997:Time Factors