Sources and topography of supramodal effects of spatial attention in ERP

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Publication Details

Author list: Barceló F
Publisher: Springer (part of Springer Nature): Springer Open Choice Hybrid Journals
Publication year: 1997
Volume number: 10
Issue number: 1
Start page: 9
End page: 22
Number of pages: 14
ISSN: 0896-0267
Languages: English-Great Britain (EN-GB)


Abstract

This study aimed to finding modality-independent event-related
potentials (ERP) modulations related to spatial attention by minimising
several possible methodological constrains which may account for the
rareness of this finding in past spatial attention ERP research. ERP
were recorded while subjects performed a shifting spatial attention task
of either auditory, visual or mixed (both auditory and visual)
modality. Task requirements and stimulation devices were identical for
either modality. Stimuli could appear (80%, valid trials) or not
(invalid trials) at predicted locations, and subjects had to perform a
speeded response to every stimulus. Reaction time benefits were found
for valid trials. Instead of the usually found enhancement of
sensory-evoked modality-specific components for valid trials, ERP showed
modality-independent modulations as a function of attention. They
consisted of a fronto-central activity starting 240 ms after stimulus
onset and originated in the anterior cingulate gyrus, followed 40 ms
later by a bilateral parietal cortex activation. These processes would
be reflecting the activity, respectively, of the anterior and posterior
attention systems postulated in Posner's model, which showed a higher
degree of participation during invalid trials. P300-like processes were
also observed for invalid trials. These results demonstrate that
supramodal effects of spatial attention on ERP can be obtained.
Furthermore, they extend Posner's model by indicating the timings of
implication of the attention subsystems.


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Last updated on 2019-13-08 at 00:16