Neural processing to visual stimuli in a three-choice reaction-time task

Zeitschriftenaufsatz


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Details zur Publikation

Autorenliste: Maestu F
Verlag: Elsevier: 12 months
Jahr der Veröffentlichung: 2001
Bandnummer: 47
Heftnummer: 3
Erste Seite: 383
Letzte Seite: 396
Seitenumfang: 14
ISSN: 0278-2626
Sprachen: Englisch-Vereinigtes Königreich (EN-GB)


Beschreibung

Some authors have suggested that certain components of the event-related
potentials (ERPs) reflect underlying stages in the discrimination
process. Previous studies have shown that in an auditive three-choice
reaction-time task the discrimination is accomplished as a two-stage
process, with the more frequently occurring stimulus discriminated at an
earlier point than the rarer stimulus and the subjects could be
classified as fast and slow responders in function of their response to
the most frequent of the three tones. We continuously recorded the
electrocerebral activity (EEG) from the scalp and the electromyographic
activity (EMG) from the responding muscles in a visual three-choice
reaction-time task in 10 strictly right-handed subjects. EEG and EMG
responses were subsequently analyzed off-line by aligning them by the
onset of either the stimulus (stimulus-synchronized) or the response
(response-synchronized). The results suggest that processes of visual
stimuli evaluation and response execution are continuously integrated.
The discrimination and response systems to visual stimuli is
accomplished as a three-stage process, one to frequent tone, another for
rare 1, and the last for rare 2. The subjects were classified as fast
and slow responders in function of their response to the most frequent
of the three tones.


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