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Invariance of the perceived spatial frequency shift of peripherally viewed gratings with manipulations of contrast, duration, and luminance.pdf
Vision Research 40 (2000) 931 – 941
/locate/visres
Invariance of the perceived spatial frequency shift of peripherally viewed gratings with manipulations of contrast, duration, and luminance
John P. Harris a,*, Brian Wink b
a Department of Psychology, The Uni6ersity of Reading, Earley Gate, Whiteknights, Reading RG6 6AL, UK b Psychology Di6ision, Uni6ersity of Wol6erhampton, Wulfruna Street, Wol6erhampton WV1 1SB, UK
Received 18 December 1998; received in revised form 16 September 1999
Abstract
Gratings appear of higher spatial frequency when they are viewed peripherally rather than foveally. To test the hypothesis that this effect is an artefact of particular laboratory conditions, we manipulated the contrast, luminance and presentation duration, manipulations which have also been shown to increase the apparent spatial frequency of foveally presented gratings. It has been argued that such shifts re?ect an attempt to increase sensitivity by changing the receptive ?eld properties of spatially tuned visual channels, while keeping their size labels constant. If so, and peripheral channels are not otherwise mislabelled, it should be possible to ?nd conditions under which the apparent spatial frequency of peripherally viewed gratings matches that of foveal gratings of the same spatial frequency. In this study, manipulations of contrast, luminance, and duration had no effect on the size of the perceived spatial frequency shift in peripheral vision. Thus the putative inappropriate size labelling of peripheral visual channels is constant over a wide range of stimulus values. We speculate that this apparent constant error may result from a mechanism which normally compensates for another factor such as blur, which may otherwise lead to an overestimation of size. ? 2000 Elsevier Science Ltd. All rights reserved.
Keywords: Peripheral vision; Spatial frequency; Contrast
1. Introduction As early as 1890 William James noted that
An object appears smaller on the lateral portions o
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