Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Estimating the components of the gap effect
Autore:
Pratt, J; Bekkering, H; Leung, M;
Indirizzi:
Univ Toronto, Dept Psychol, Toronto, ON M5S 3G3, Canada Univ Toronto Toronto ON Canada M5S 3G3 ychol, Toronto, ON M5S 3G3, Canada Max Planck Inst Psychol Res, D-8000 Munich, Germany Max Planck Inst Psychol Res Munich Germany D-8000 D-8000 Munich, Germany
Titolo Testata:
EXPERIMENTAL BRAIN RESEARCH
fascicolo: 2, volume: 130, anno: 2000,
pagine: 258 - 263
SICI:
0014-4819(200001)130:2<258:ETCOTG>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIXATION POINT OFFSETS; SACCADIC EYE-MOVEMENTS; EXPRESS SACCADES; SUPERIOR COLLICULUS; VISUAL FIXATION; WARNING SIGNALS; LATENCY; ATTENTION; MONKEY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Pratt, J Univ Toronto, Dept Psychol, 100 St George St, Toronto, ON M5S 3G3, Canada Univ Toronto 100 St George St Toronto ON Canada M5S 3G3 3, Canada
Citazione:
J. Pratt et al., "Estimating the components of the gap effect", EXP BRAIN R, 130(2), 2000, pp. 258-263

Abstract

The gap effect refers to the finding that saccadic latencies are typicallyreduced when a fixation point is removed prior to the appearance of a peripheral target. This reduction in saccadic reaction time (SacRT) is thought to be due to a general warning effect and an oculomotor specific fixation offset that occur when the fixation point is removed. In order to estimate the contribution of each of these effects to the overall gap effect, this paper introduces a new manipulation, the partial-gap trial, where the fixation point undergoes a change in size prior to the presentation of the target. The partial-gap trial is presumed to provide the visual warning effect of the fixation offset (i.e. similar to that in a gap trial) but does not provide the fixation offset effect (FOE). When the fixation point was abruptly reduced in size before the presentation of the target, the estimated decrease in SacRT due to the visual warning effect was 5-7% and did not differ inthe presence or absence of an auditory warning signal. It was found that auditory warning effect and the FOE interacted in reducing SacRTs. Additional ly. when the fixation point was abruptly increased in size before the presentation of the target, SacRTs were slower than when the fixation point did not change in size and remained present fur the entire trial (i.e. an overlap trial). We conclude that this new partial-gap paradigm is a useful method for researchers wishing to separately examine FOE and visual warning effects.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 14:58:06