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Deriving channel gains from large-area sine-wave contrast sensitivity data

Deriving channel gains from large-area sine-wave contrast sensitivity data Deriving channel gains from large-area sine-wave contrast sensitivity data MIGUEL A. GARCÍA-PÉREZ1 and VICENTE SIERRA-VÁZQUEZ2 1Departamento de Metodología and 2Departamento de Psicologia Básica-I, Facultad de Psicologia, Universidad Complutense, Campus de Somosaguas, 28223 Madrid, Spain Received 31 August 1993; revised 7 November 1994; accepted 11 November 1994 Abstract-A wealth of detection data can be accounted for by a spatial-vision model including a finite number of space-variant, spatial-frequency and orientation-selective channels of varying gains coupled with a detection rule involving probability summation over space and among channels. This paper shows that the detection of large-area, foveally fixated sine-wave gratings can be understood as if it occurred merely as a result of the activity of the subset of channels whose orientation matches that of the gratings, and operating under a peak-detection rule. This simplification makes it possible to show the theoretical relationship between the large-area sine-wave contrast sensitivity function, the channel gain function, and the channel modulation-transfer functions. It is also shown that the human visual system must have many more channels than are normally assumed in spatial-vision models, for otherwise the contrast sensitivity function would show significant bumps. An unlimited-channel model with a given mathematical form for the channels' modulation http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Spatial Vision (continued as Seeing & Perceiving from 2010) Brill

Deriving channel gains from large-area sine-wave contrast sensitivity data

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Publisher
Brill
Copyright
© 1995 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0169-1015
eISSN
1568-5683
DOI
10.1163/156856895X00205
Publisher site
See Article on Publisher Site

Abstract

Deriving channel gains from large-area sine-wave contrast sensitivity data MIGUEL A. GARCÍA-PÉREZ1 and VICENTE SIERRA-VÁZQUEZ2 1Departamento de Metodología and 2Departamento de Psicologia Básica-I, Facultad de Psicologia, Universidad Complutense, Campus de Somosaguas, 28223 Madrid, Spain Received 31 August 1993; revised 7 November 1994; accepted 11 November 1994 Abstract-A wealth of detection data can be accounted for by a spatial-vision model including a finite number of space-variant, spatial-frequency and orientation-selective channels of varying gains coupled with a detection rule involving probability summation over space and among channels. This paper shows that the detection of large-area, foveally fixated sine-wave gratings can be understood as if it occurred merely as a result of the activity of the subset of channels whose orientation matches that of the gratings, and operating under a peak-detection rule. This simplification makes it possible to show the theoretical relationship between the large-area sine-wave contrast sensitivity function, the channel gain function, and the channel modulation-transfer functions. It is also shown that the human visual system must have many more channels than are normally assumed in spatial-vision models, for otherwise the contrast sensitivity function would show significant bumps. An unlimited-channel model with a given mathematical form for the channels' modulation

Journal

Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill

Published: Jan 1, 1995

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