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Titolo:
Invariance of long-term visual priming to scale, reflection, translation, and hemisphere
Autore:
Fiser, J; Biederman, I;
Indirizzi:
Univ So Calif, Dept Psychol, Los Angeles, CA 90089 USA Univ So Calif Los Angeles CA USA 90089 Psychol, Los Angeles, CA 90089 USA Univ Rochester, Dept Brain & Cognit Sci, Ctr Visual Sci, Rochester, NY 14627 USA Univ Rochester Rochester NY USA 14627 Visual Sci, Rochester, NY 14627 USA Univ So Calif, Neurosci Program, Los Angeles, CA 90089 USA Univ So Calif Los Angeles CA USA 90089 Program, Los Angeles, CA 90089 USA
Titolo Testata:
VISION RESEARCH
fascicolo: 2, volume: 41, anno: 2001,
pagine: 221 - 234
SICI:
0042-6989(2001)41:2<221:IOLVPT>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
INFERIOR TEMPORAL NEURONS; OBJECT RECOGNITION; SPATIAL-FREQUENCY; VIEWPOINT INVARIANCE; MAGNIFICATION FACTOR; GLOBAL PRECEDENCE; SIZE INVARIANCE; NATURAL IMAGES; CORTEX; MACAQUE;
Keywords:
object recognition; spatial frequency; shape representation; ventral pathway; hemisphere laterality;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Biederman, I Univ So Calif, Dept Psychol, Hedco Neurosci Bldg,MC 2520, LosAngeles, CA 90089 USA Univ So Calif Hedco Neurosci Bldg,MC 2520 Los Angeles CA USA 90089
Citazione:
J. Fiser e I. Biederman, "Invariance of long-term visual priming to scale, reflection, translation, and hemisphere", VISION RES, 41(2), 2001, pp. 221-234

Abstract

The representation of shape mediating visual object priming was investigated. In two blocks of trials, subjects named images of common objects presented for 185 ms that were bandpass filtered, either at high (10 cpd) or at low (2 cpd) center frequency with a 1.5 octave bandwidth, and positioned either 5 degrees right or left of fixation. The second presentation of an image of a given object type could be filtered at the same or different band, be shown at the same or translated (and mirror reflected) position, and be the same exemplar as that in the first block or a same-name different-shapedexemplar (e.g. a different kind of chair). Second block reaction times (RTs) and error rates were markedly lower than they were on the first block, which, in the context of prior results, was indicative of strong priming. A change of exemplar in the second block resulted in a significant cost in RTs and error rates, indicating that a portion of the priming was visual and not just verbal or basic-level conceptual. However, a change in the spatialfrequency (SF) content of the image had no effect on priming despite the dramatic difference it made in appearance of the objects. This invariance toSF changes was also preserved with centrally presented images in a second experiment. Priming was also invariant to a change in left-right position (and mirror orientation) of the image. The invariance over translation of such a large magnitude suggests that the locus of the representation mediating the priming is beyond an area that would be homologous to posterior TEO in the monkey. We conclude that this representation is insensitive to low level image variations (e.g. SF, precise position or orientation of features)that do not alter the basic part-structure of the object. Finally, recognition performance was unaffected by whether low or high bandpassed images were presented either in the left or right visual field, giving no support tothe hypothesis of hemispheric differences in processing low and high spatial frequencies. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 01:34:21