Abstract
Event-related potentials (ERPs) in response to a stimulus change in the visual color
modality were recorded in normal subjects and children with mental retardation (MR)
under selective attention conditions with auditory stimuli. The paradigm included
the presentation of a standard (blue color screen, B) or deviant (red, R, or greenish
blue color screen, GB) visual stimulus, and a target or non-target tone burst stimulus.
In Experiment 1, negativity of the subtracted waveform in response to visual stimuli
with a latency of 250–280 ms was clearly observed in the ERPs of normal adults. These
potentials prominently appeared at posterior sites in one condition, for which the
deviant was GB, but were frontal site-dominant for the other condition. A P300 response
to visual deviance was not observed in the GB-B paradigm and the subtracted negativity
for this paradigm seemed to be more evident than that for the R-B paradigm. The subtracted
negativities could be detected in the range of 180–400 ms after the stimulus onset
in control children for the GB-B paradigm. The grand average waves of subtracted ERPs
in normal children showed a similar distribution to that in normal adults. Similar
subtracted potentials could be recorded with the same paradigm in children with MR,
however, the negativities were different in waveform and spatial distribution than
in controls. Therefore, the subtracted negativity of the present visual modality represented
the analogue of the auditory mismatch negativity (MMN), and so-called ‘visual MMN’
was detectable in children and even in MR patients when the selective attention was
directed to other stimuli.
Keywords
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Article info
Publication history
Accepted:
May 29,
2002
Received in revised form:
May 7,
2002
Received:
February 18,
2002
Identification
Copyright
© 2002 Elsevier Science B.V. Published by Elsevier Inc. All rights reserved.
