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Titolo:
Control of eye movement reflexes
Autore:
Machado, L; Rafal, R;
Indirizzi:
Univ Wales, Dept Psychol, Bangor LL57 2AS, Gwynedd, Wales Univ Wales Bangor Gwynedd Wales LL57 2AS Bangor LL57 2AS, Gwynedd, Wales
Titolo Testata:
EXPERIMENTAL BRAIN RESEARCH
fascicolo: 1, volume: 135, anno: 2000,
pagine: 73 - 80
SICI:
0014-4819(200011)135:1<73:COEMR>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
MONKEY SUPERIOR COLLICULUS; FIXATION POINT OFFSETS; ENDOGENOUS SACCADES; STIMULATION; EXECUTION; LATENCIES; LESIONS;
Keywords:
fixation offset effect; inhibition; saccade; oculomotor; human;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Machado, L Univ Wales, Dept Psychol, Bangor LL57 2AS, Gwynedd, Wales Univ Wales Bangor Gwynedd Wales LL57 2AS 7 2AS, Gwynedd, Wales
Citazione:
L. Machado e R. Rafal, "Control of eye movement reflexes", EXP BRAIN R, 135(1), 2000, pp. 73-80

Abstract

We investigated the effect of strategic suppression of reflexive eye movements on external control over fixation using a fixation offset paradigm. A visual signal at fixation facilitates the fixation reflex and inhibits eye movements. Certain preparatory states render the fixation reflex less reactive to visual stimulation at fixation, as evidenced by a reduction in the fixation offset effect (FOE). For example, past studies have suggested that the reduced FOE during anti-saccade tasks results from the requirement to inhibit reflexive eye movements. We tested whether suppressing reflexive saccades reduces external control over ocular fixation using a go-nogo saccadeparadigm. During each trial, one of two targets appeared in the periphery. Participants were instructed to saccade to one target (go), but when the other target appeared they either had to maintain fixation (nogo) or move their eyes in the direction opposite the target (anti). When nogo trials wereadmired with target-directed saccades a large FOE was observed compared towhen target-directed saccades occurred alone (experiment 1); however, whenanti-saccades were mixed with target-directed saccades, a small FOE was observed for both types of eye movements (experiment 2). We conclude that suppressing reflexive eye movements does not reduce external control over fixation. Further research is necessary to elucidate which other component of preparing to make an anti-saccade diminishes the FOE.

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Documento generato il 21/09/20 alle ore 10:45:43