PMID: 8599823Dec 13, 1995Paper

Cognitive and visual functions in a sample of the aged population: analysis of evoked potentials

Casopís lékar̆ů c̆eských
R Jech, E Růzicka

Abstract

There are significant changes of perception and cognition during aging. Goal of this study was to investigate these functions by means of evoked potentials, and to obtain normative data in older people for comparisons with cognitive disorders in the elderly. Twenty three healthy subjects (14 women and 9 men), aged 59 to 82 years (average 68 years), were examined for auditory event-related potentials (AERP) and somatosensory event-related potentials (SERP) using pattern reversal stimulation with large squares (1 degree 10') and small vertical bars (10'). The exogenous components N1 and P2 in both AERP and SERP exhibited significantly longer latencies and higher amplitude in response to target stimuli compared to an indifferent stimulus, a fact attributable to selective attention mechanisms (AERP: N1 delay 8 ms, p < 0.001; P2 delay 11 ms, p < 0.05; increase in amplitude N1/P2 2.2 microV, p < 0.01; SERP: N1 delay 8 ms, p < 0.05; P2 17 ms, p < 0.01; increase in amplitude N1/P2 8 microV, p < 0.001). As for the endogenous components N2 and P3, there were no latency differences between the two modalities (N2: p < 0.4; P3a: p < 02; P3b: p < 0.2). Significant correlations were found between P3 latencies AERP and SERP (r = 0.56, p < 0.01...Continue Reading

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