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Titolo:
Control of saccade initiation in a countermanding task using visual and auditory stop signals
Autore:
Cabel, DWJ; Armstrong, IT; Reingold, E; Munoz, DP;
Indirizzi:
Queens Univ, Dept Physiol, Kingston, ON K7L 3N6, Canada Queens Univ Kingston ON Canada K7L 3N6 siol, Kingston, ON K7L 3N6, Canada Univ Toronto, Dept Psychol, Toronto, ON M5S 1A1, Canada Univ Toronto Toronto ON Canada M5S 1A1 ychol, Toronto, ON M5S 1A1, Canada
Titolo Testata:
EXPERIMENTAL BRAIN RESEARCH
fascicolo: 4, volume: 133, anno: 2000,
pagine: 431 - 441
SICI:
0014-4819(200008)133:4<431:COSIIA>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
MONKEY SUPERIOR COLLICULUS; EXTENDED FIXATION ZONE; EYE-MOVEMENTS; SENSORIMOTOR INTEGRATION; MULTISENSORY INTEGRATION; CELLS; DISTRACTORS; CONVERGENCE; DISCHARGE; NEURONS;
Keywords:
eye movement; oculomotor countermanding; saccade; inhibitory control; human;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Munoz, DP Queens Univ, Dept Physiol, Kingston, ON K7L 3N6, Canada Queens Univ Kingston ON Canada K7L 3N6 ston, ON K7L 3N6, Canada
Citazione:
D.W.J. Cabel et al., "Control of saccade initiation in a countermanding task using visual and auditory stop signals", EXP BRAIN R, 133(4), 2000, pp. 431-441

Abstract

We examined inhibitory control in an oculomotor countermanding task, wherethe primary task required a saccadic eye movement be made to a target and a less-frequent secondary task required that the movement be halted. Previous studies have used a visual stimulus presented centrally on the fovea as the signal to stop or countermand a saccade. In these previous studies, there are at least two possible sources of saccadic inhibition: (1) sensory stimulation at the fovea can elicit a bottom-up mechanism, where a visual transient signal can delay or inhibit the developing saccade command; and (2) information based on the task instruction can be used to initiate a top-down mechanism to halt the movement. In the present study, we used both visualand auditory stop signals to test the hypothesis that the bottom-up mechanism is activated only after presentation of a foveal visual stop signal. Subjects were instructed first to look at a central spot and then to look to an eccentric visual target that appeared randomly to the left or right of center. On about one-third of the trials, a stop signal was presented. Threetypes of stop signals were used with equal probability: a broad-band noiseburst (auditory), a central fixation spot (visual), and a combination of the auditory and visual stimuli (combined). Saccadic reaction time and stop-signal accuracy were used to calculate stop signal reaction time (SSRT), anestimate of the time required to inhibit the eye movement. Mean SSRT was longer for the auditory stop signals (201 ms) than for the signals with a foveal visual component (visual 113 ms; combined 91 ms). We conclude that a foveal visual stop signal in an oculomotor countermanding task changes the measure of inhibitory control to reflect not only inhibitory processes but also the sensory information afforded by stimulation at the fovea.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 14:02:21