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Titolo:
Separate simultaneous processing of egocentric and relative positions
Autore:
Brenner, E; Cornelissen, FW;
Indirizzi:
Erasmus Univ, Dept Physiol, NL-3000 DR Rotterdam, Netherlands Erasmus Univ Rotterdam Netherlands NL-3000 DR DR Rotterdam, Netherlands Univ Groningen, Sch Behav & Cognit Neurosci, Lab Expt Ophthalmol, NL-9700 RB Groningen, Netherlands Univ Groningen Groningen Netherlands NL-9700 RBB Groningen, Netherlands
Titolo Testata:
VISION RESEARCH
fascicolo: 19, volume: 40, anno: 2000,
pagine: 2557 - 2563
SICI:
0042-6989(2000)40:19<2557:SSPOEA>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
SACCADIC EYE-MOVEMENTS; SPATIAL LOCALIZATION; DISTANCE; SHAPE; DEPTH; FORM;
Keywords:
eye movements; independent processing; egocentric localisation; spatial positions;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Brenner, E Erasmus Univ, Dept Physiol, POB 1738, NL-3000 DR Rotterdam, Netherlands Erasmus Univ POB 1738 Rotterdam Netherlands NL-3000 DR erlands
Citazione:
E. Brenner e F.W. Cornelissen, "Separate simultaneous processing of egocentric and relative positions", VISION RES, 40(19), 2000, pp. 2557-2563

Abstract

It is well established that all kinds of visual attributes are processed separately within the brain. This separation is related to differences in the information that is relevant for the different attributes. When attributes differ greatly (such as colour and motion) it is obvious that they must rely on different information. However, separating the processing of different attributes could also allow highly related attributes to evolve independently, so that they end up being judged on the basis of different types of information. Here, we examine the case of egocentric and relative localisation. For judging egocentric positions, the orientation of the eyes has to be taken into account. This is not so for judging relative positions. We demonstrate that these two attributes can be processed separately by showing that simultaneous judgements of relative and egocentric position differ in their dependency on eye orientation. Subjects pursued a moving dot. We Bashed either single targets, or pairs of targets with a 67 ms interval between them, directly below the subjects' gaze. As the eyes were moving during the67 ms interval, the retinal separation between pairs of targets was different from their actual separation. Subjects indicated the position at which they saw the targets with reasonable reproducibility, with a consistent bias in the direction of the eye movement. However, when two targets were flashed, the indicated separation between them usually coincided with their retinal separation, rather than with their actual separation. We conclude thategocentric and relative spatial positions can be estimated separately and simultaneously, on the basis of different types of information. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 00:36:44