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Titolo:
ATTENTION TO ADJACENT AND SEPARATE POSITIONS IN-SPACE - AN ELECTROPHYSIOLOGICAL ANALYSIS
Autore:
HEINZE HJ; LUCK SJ; MUNTE TF; GOS A; MANGUN GR; HILLYARD SA;
Indirizzi:
HANNOVER MED SCH,KONSTANTY GUTSCHOW STR 8 W-3000 HANNOVER 61 GERMANY UNIV CALIF LOS ANGELES,DEPT NEUROSCI 0608 LOS ANGELES CA 90024 UNIV CALIF DAVIS DAVIS CA 95616
Titolo Testata:
Perception & psychophysics
fascicolo: 1, volume: 56, anno: 1994,
pagine: 42 - 52
SICI:
0031-5117(1994)56:1<42:ATAASP>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
BILATERAL STIMULUS ARRAYS; INDEX FOCUSED ATTENTION; VISUAL-ATTENTION; BRAIN POTENTIALS; SELECTIVE ATTENTION; FOCAL ATTENTION; SPATIAL LOCATIONS; FIELD; ALLOCATION; GRADIENTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social Sciences Citation Index
Science Citation Index Expanded
Citazioni:
48
Recensione:
Indirizzi per estratti:
Citazione:
H.J. Heinze et al., "ATTENTION TO ADJACENT AND SEPARATE POSITIONS IN-SPACE - AN ELECTROPHYSIOLOGICAL ANALYSIS", Perception & psychophysics, 56(1), 1994, pp. 42-52

Abstract

Some theories of visuospatial attention propose that attention can bedivided between separated zones of space that exclude the interveningregion, whereas other theories state that the focus of attention mustencompass a unitary, continuous zone. These contrasting views were evaluated in an experiment in which subjects were required to monitor two of four stimulus locations for targets; the two relevant locations were adjacent in one condition and were separated by an intervening irrelevant location in a second condition. To assess the distribution of attention a the relevant and irrelevant locations, event-related brainpotentials (ERPs) were recorded to task-irrelevant ''probe'' stimuli that were occasionally presented at the individual stimulus locations. When the relevant locations were adjacent, probes presented at irrelevant locations elicited smaller sensory-evoked electrophysiological responses than probes presented at relevant locations, consistent with an attentional suppression of inputs from the unattended locations. When the relevant locations were separated by an irrelevant location, however, the sensory responses evoked by probes presented at this intervening irrelevant location were not suppressed, and target detection Performance became slower and less accurate. These results suggest that attention forms a unitary zone that may expand to encompass multiple relevant locations but must also include the area between them; as a result, irrelevant information arising from intervening locations is not suppressed and perceptual processing is compromised.

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Documento generato il 22/09/20 alle ore 13:03:37