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Titolo:
ANALYSIS OF THE EFFECT OF PATTERN ADAPTATION ON PATTERN PEDESTAL EFFECTS - A 2-PROCESS MODEL
Autore:
FOLEY JM; CHEN CC;
Indirizzi:
UNIV CALIF SANTA BARBARA,DEPT PSYCHOL SANTA BARBARA CA 93106
Titolo Testata:
Vision research
fascicolo: 19, volume: 37, anno: 1997,
pagine: 2781 - 2788
SICI:
0042-6989(1997)37:19<2781:AOTEOP>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPATIAL-FREQUENCY ADAPTATION; CAT STRIATE CORTEX; CONTRAST-RESPONSE FUNCTION; SQUARE-WAVE GRATINGS; VISUAL-CORTEX; GAIN-CONTROL; MASKING; INHIBITION; CELLS; SELECTIVITY;
Keywords:
SPATIAL; PATTERN; DETECTION; ADAPTATION; MASKING; MODEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
44
Recensione:
Indirizzi per estratti:
Citazione:
J.M. Foley e C.C. Chen, "ANALYSIS OF THE EFFECT OF PATTERN ADAPTATION ON PATTERN PEDESTAL EFFECTS - A 2-PROCESS MODEL", Vision research, 37(19), 1997, pp. 2781-2788

Abstract

Pattern contrast thresholds for vertical Gabor patterns were measuredon pattern pedestals that were vertical or horizontal, Contrast of the pedestal was varied to measure the function relating target contrastthreshold to pedestal contrast (TvC function), TvC functions were measured without an adaptor and after adaptation to vertical, horizontal and plaid patterns, For a pedestal with the same orientation as the target, the vertical and plaid adapters increased thresholds at low pedestal contrasts, but not high, For the pedestal orthogonal to the target, the same two adaptors increased thresholds over the whole range of pedestal contrasts, These asymmetric effects are described by a model of adaptation and masking derived from a model of masking (Foley, 1994a) by allo,ring two parameters to vary with the adapt state; one of them is an additive parameter in the denominator of the response function, which can be interpreted as adaptor-produced divisive inhibition that persists after adaptor offset; the other is the sensitivity to pedestal-produced divisive inhibition, which is changed by adaptation for the pedestal orthogonal to the target, Other models do not account forboth effects, (C) 1997 Elsevier Science Ltd.

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Documento generato il 03/12/20 alle ore 12:24:23