AGING, CONCENTRATION ON A TASK AND EVENT RELATED POTENTIALS

概要

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Auditory event related potentials were recorded in 80 normal subjects (37 males and 43 females) aged from 10 to 81 years on an oddball task. The stimulus was a pure tone delivered binaurally at 75 dB SPL with a frequency of 1 kHz (frequent 80%) or 2 kHz (rare, target 20%). The subjects responded to target stimuli either by counting or by pressing a button. EEG was recorded from Cz and Pz referred to linked mastoids. The period from the tone delivery to the button-pressing was recorded and it was defined as the reaction time. The mean (RT) and the standard deviation (SD) of the reaction time were calculated.<BR>The SD was interpreted to indicate the concentration of the subjects on the task. Results were as follows. The count condition may reflect aging more than the button-pressing condition. The N200 is related with the cognition of the stimulus more directly than the P300. The latency of P300 increased with age at a rate of 1.04 msec/year for count condition and 0.989 msec/year for button condition. The amplitude of P300 is more influenced by the concentration of subjects on the task than by aging.
北関東医学会の論文