Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
PITFALLS IN ESTIMATING MOTION DETECTOR RECEPTIVE-FIELD GEOMETRY
Autore:
FREDERICKSEN RE; VERSTRATEN FAJ; VANDEGRIND WA;
Indirizzi:
MCGILL VIS RES UNIT,687 PINE AVE W H4-14 MONTREAL PQ H3A 1A1 CANADA HARVARD UNIV,VIS SCI LAB CAMBRIDGE MA 02138 UNIV UTRECHT,HELMHOLTZ INST NL-3584 CH UTRECHT NETHERLANDS UNIV UTRECHT,DEPT COMPARAT PHYSIOL NL-3584 CH UTRECHT NETHERLANDS
Titolo Testata:
Vision research
fascicolo: 1, volume: 37, anno: 1997,
pagine: 99 - 119
SICI:
0042-6989(1997)37:1<99:PIEMDR>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
RANDOM-DOT PATTERNS; TEMPORAL INTEGRATION MECHANISM; MONOCULAR VISUAL-FIELD; SPATIAL WHITE NOISE; APPARENT MOTION; PROBABILITY SUMMATION; COHERENT MOTION; FOURIER PLANE; HUMAN VISION; DISPLACEMENT;
Keywords:
MOTION PERCEPTION; SPATIAL SUMMATION OF MOTION; MOTION DETECTORS; RECEPTIVE FIELD GEOMETRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
R.E. Fredericksen et al., "PITFALLS IN ESTIMATING MOTION DETECTOR RECEPTIVE-FIELD GEOMETRY", Vision research, 37(1), 1997, pp. 99-119

Abstract

A number of psychophysical investigations have used spatial-summationmethods to estimate the receptive field (RF) geometry of motion detectors by exploring how psychophysical thresholds change with stimulus height and/or width, This approach is based on the idea that an observer's ability to detect motion direction is strongly determined by the relationship between the stimulus geometry (height and width) and the RF of the activated motion detectors. Our results show that previous estimates of RF geometry can depend significantly on stimulus position in the visual field as well as on the stimulus height-to-width ratio, The data further show that RF estimates depend on the stimulus in a manner that is inconsistent with basic predictions derived from current motion detector models, Hence previous estimates of height, width, and height-to-width ratios of motion detector RFs are inaccurate and unreliable, This inaccurac/unreliability is attributed to a number of sources, These include incorrect fixed-parameter values in model fits, as well as the confounding of physiological spatial summation area throughcombined use of contrast thresholds and Gaussian-windowed stimuli, A third source of error is an asymmetric variation of spatiotemporal correlation in the stimulus as either its height or width is varied (and the other dimension held constant), Most importantly, a fourth source of unreliability is attributed to the existence of a nonlinear, nonmonotonic distribution of motion detectors in the visual field that has been previously described and is a natural result of visual anatomy. Copyright (C) 1996 Elsevier Science Ltd

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 18:55:17