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Abstract:
5yr) participated in a developmental study of a continuous
performance task (CPT) while event-related brain potentials were
recorded. Subjects viewed a sequence of 400 letters on a computer
monitor and pressed a key whenever an X followed an A (AX =12.5%).
Non-X letters also appeared after an A (AnotX=12.5%). The
inter-stimulus interval was 2 sec and the stimulus duration was 1
sec.
Both groups exhibited similar P300s to AX over parietal sites. The
frontal P300 was reduced and later in children compared to adults.
AnotX elicited a smaller, later occurring P300 that was especially
reduced and late in children. Only children showed a late frontal
slow wave to AnotX.
Results reveal the most significant differences between groups to
be over frontal sites in both conditions, but especially in the
AnotX condition. These differences are probably due to the late
maturation of frontal lobes and related executive
processing.
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