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Titolo:
THE EFFECTS OF SPATIOTEMPORAL INTEGRATION ON MAXIMUM DISPLACEMENT THRESHOLDS FOR THE DETECTION OF COHERENT MOTION
Autore:
TODD JT; NORMAN JF;
Indirizzi:
OHIO STATE UNIV,DEPT PSYCHOL,142 TOWNSHEND HALL COLUMBUS OH 43210 OHIO STATE UNIV,CTR COGNIT SCI COLUMBUS OH 43210
Titolo Testata:
Vision research
fascicolo: 16, volume: 35, anno: 1995,
pagine: 2287 - 2302
SICI:
0042-6989(1995)35:16<2287:TEOSIO>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
RANDOM-DOT PATTERNS; RANGE APPARENT MOTION; MONOCULAR VISUAL-FIELD; SPATIAL WHITE NOISE; TEMPORAL PROPERTIES; NEURAL DYNAMICS; PERCEPTION; MOVEMENT; LIMITS; DISCRIMINATION;
Keywords:
MOTION PERCEPTION; APPARENT MOTION; SPATIOTEMPORAL INTEGRATION; DISPLACEMENT THRESHOLDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
51
Recensione:
Indirizzi per estratti:
Citazione:
J.T. Todd e J.F. Norman, "THE EFFECTS OF SPATIOTEMPORAL INTEGRATION ON MAXIMUM DISPLACEMENT THRESHOLDS FOR THE DETECTION OF COHERENT MOTION", Vision research, 35(16), 1995, pp. 2287-2302

Abstract

In a series of nine experiments, observers were required to identify the shapes of moving targets, and to discriminate regions of motion from regions of uncorrelated noise, Maximum displacement thresholds (D-max) for performing these tasks were obtained under a wide variety of conditions, The stimulus parameters manipulated included the number of distinct frames in the motion sequences, the stimulus onset asynchronybetween each frame, the size of the moving dots, and the shape, area and eccentricity of the target regions, For two-frame displays presented in alternation, the area of the target region was the only one of these variables to have any significant effect on D-max. For longer length sequences, in contrast, D-max varied dramatically among the different conditions over a range of 10 min are to 10 deg, In an effort to isolate the specific processes of spatiotemporal integration, we also examined how performance is affected by having overlapping transparent motions in opposite directions, or by the presence of dynamic noise orlimited dot lifetimes within the moving target regions, The overall pattern of results suggest that D-max is primarily determined by the ability of the visual system to isolate motion signals from the noise produced by spurious false target correlations, As a general rule, D-maxwill increase as a result of any stimulus manipulation that increasesthe number of local signal correlations detected relative to those arising from noise, and vice versa.

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Documento generato il 25/09/20 alle ore 08:54:44