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Titolo:
Infants' sensitivity to statistical distributions of motion direction and speed
Autore:
Banton, T; Bertenthal, BI; Seaks, J;
Indirizzi:
Univ Virginia, Dept Psychol, Charlottesville, VA 22903 USA Univ Virginia Charlottesville VA USA 22903 Charlottesville, VA 22903 USA
Titolo Testata:
VISION RESEARCH
fascicolo: 20, volume: 39, anno: 1999,
pagine: 3417 - 3430
SICI:
0042-6989(199910)39:20<3417:ISTSDO>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
KITTENS VISUAL-CORTEX; RANDOM DOT PATTERNS; ORIENTATION DISCRIMINATION; SUBJECTIVE CONTOURS; SPATIAL INTEGRATION; GLOBAL MOTION; PERCEPTION; INFORMATION; ORGANIZATION; COHERENCE;
Keywords:
development; infant; motion; direction; speed;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Banton, T Univ Virginia, Dept Psychol, Rm B032,Gilmer Hall, Charlottesville, VA 22903 USA Univ Virginia Rm B032,Gilmer Hall Charlottesville VA USA 22903 A
Citazione:
T. Banton et al., "Infants' sensitivity to statistical distributions of motion direction and speed", VISION RES, 39(20), 1999, pp. 3417-3430

Abstract

Adults combine different local motions to form a global percept of motion. This study explores the origins of this process by testing how perturbations of local motion influence infants' sensitivity to global motion. Infantsat 6-, 12-, and 18-weeks of age viewed random dots moving with a gaussian distribution of dot directions defined by a mean of 0 degrees (rightward) or 180 degrees (leftward) and a standard deviation (SD) of 0, 34, or 68 degrees. A well-practiced observer used infants' optokinetic responses to judgethe direction of stimulus motion. Infants were studied both cross-sectionally and longitudinally. Direction discrimination was relatively high at allages when the SD was 0 degrees. When the SD was 34 or 68 degrees, performance declined with age. Adult performance was nearly perfect at these SDs. Asimilar developmental pattern was found with distributions of dot speed. The decline in infant performance is consistent with the development of bothneural tuning and receptive field size. The subsequent improvement by adulthood suggests the development of additional processes such as long-range interactions. (C) 1999 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 05:46:56