Abstract:
:In this study the organization of information processing in a selective search task was examined by analyzing event-related potentials. This task consisted of searching for target letters in a relevant (attended) color. The ERPs revealed two different effects of attention: an early occipital negativity (+/- 150 ms) reflecting feature-specific attention, and a later, central N2b component (+/- 240 ms) reflecting covert orienting of attention. A later, prolonged negativity (search-related negativity) (+/- 300 ms), maximal at Cz, was related to controlled search to letters in the attended color. Detection of relevant targets resulted in a parietal P3b component. Depending on stimulus presentation conditions an earlier response to both attended and unattended targets was found: an N2 component (+/- 250 ms). In these same conditions, C'3-C'4 asymmetries (Corrected Motor Asymmetries--CMA) suggested motor activation at +/- 300 ms, in the same time range as search-related negativity. It was argued that N2 and CMA suggest the existence of a preattentive target detection system, operating in parallel with a slower serial attentive system, as reflected by N2b and search negativity.
journal_name
Psychophysiologyjournal_title
Psychophysiologyauthors
Wijers AA,Mulder G,Okita T,Mulder LJ,Scheffers MKdoi
10.1111/j.1469-8986.1989.tb03137.xsubject
Has Abstractpub_date
1989-01-01 00:00:00pages
89-109issue
1eissn
0048-5772issn
1540-5958journal_volume
26pub_type
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