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Spatial Vision , Vol. 16, No. 1, pp. 77– 93 (2002) Ó VSP 2002. Also available online - www.vsppub.com A parametric account of contrast adaptation on contrast perception KEITH LANGLEY ¤ Department of Psychology, University College London, London, UK Received 6 December 2001; revised 1 February 2002; accepted 7 February 2002 Abstract —The effect of contrast adaptation on perceived contrast is assessed by contrast matching spatially adjacent sinusoidal gratings of similar spatial frequency, but different contrast and orienta- tion. The main empirical question asked is why a high contrast orthogonal adaptor appears to am- plify contrast signals through an increase in the slope of the contrast matching function but does not affect the threshold contrast at which a grating is detected. To explain this effect of adaptation, the Naka– Rushton receptor equation is employed as a description of the visual system’s contrast response function. It is reported that the effects of adaptation may be described by three isotropic components, namely, signal ampli cation, division and addition, and one orientation speci c component of sub- traction. By collating the predictions made by the Naka– Rushton receptor equation with existing psychophysical data, it is shown that the magnitude of the
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 2002
Keywords: DIVISION; RECEPTOR EQUATION.; NAKA-RUSHTON; SPATIAL FREQUENCY; SUMMATION; AMPLIFICATION; CONTRAST ADAPTATION
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