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Titolo:
THE GAP EFFECT AND EXPRESS SACCADES IN THE AUDITORY MODALITY
Autore:
SHAFIQ R; STUART GW; SANDBACH J; MARUFF P; CURRIE J;
Indirizzi:
MENTAL HLTH RES INST VICTORIA,LOCKED BAG 11 PARKVILLE VIC 3052 AUSTRALIA SWINBURNE UNIV TECHNOL,SCH BIOPHYS SCI & ELECT ENGN HAWTHORN VIC 3122AUSTRALIA
Titolo Testata:
Experimental Brain Research
fascicolo: 2, volume: 118, anno: 1998,
pagine: 221 - 229
SICI:
0014-4819(1998)118:2<221:TGEAES>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
FRONTAL EYE FIELD; VISUALLY GUIDED SACCADES; FIXATION-POINT OFFSETS; SHORT REACTION-TIMES; SUPERIOR COLLICULUS; WARNING SIGNALS; ATTENTIONAL DISENGAGEMENT; STIMULUS ONSET; LATENCY; MOVEMENTS;
Keywords:
EXPRESS SACCADES; GAP EFFECT; AUDITORY SACCADES; FIXATION DISENGAGEMENT; ATTENTIONAL DISENGAGEMENT; HUMAN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
56
Recensione:
Indirizzi per estratti:
Citazione:
R. Shafiq et al., "THE GAP EFFECT AND EXPRESS SACCADES IN THE AUDITORY MODALITY", Experimental Brain Research, 118(2), 1998, pp. 221-229

Abstract

Latencies of eye movements to peripheral targets are reduced when there is a short delay (typically 200 ms) between the offset of a centralvisual fixation point and the target onset. This has been termed the gap effect. In addition, some subjects, usually with practice, exhibita separate population of very short latency saccades, called express saccades. Both these phenomena have been attributed to disengagement of visual attention when the fixation point is extinguished. A competing theory of the gap effect attributes it to disengagement of oculomotor fixation during the temporal gap. It is known that auditory targets are effective in eliciting saccadic eye movements, and also that covert attention operates in the auditory modality. If the gap effect and express saccades are due to disengagement of spatial attention, both should persist in the auditory modality. However, fixation of gaze is largely under visual control. If the gap effect results from disengagement of fixation, then at least a reduced effect should be seen in the auditory modality. Human subjects performed the gap task and a control task in the dark, using auditory fixation points and saccadic targets,on five successive days. Despite this practice, ex press saccades were not observed. There was a reliable gap effect, but the reduction in saccadic latency was only 17 ms, compared with 32 ms for the same subjects in the visual modality. This suggests that about half the gap effect is due to disengagement of visual fixation. The remainder was not due to non-specific warning effects and could be attributed to offset of the auditory fixation stimulus.

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Documento generato il 13/07/20 alle ore 05:14:29