Neural adjustments to chromatic blur

Neural adjustments to chromatic blur Spatial Vision , Vol. 19, No. 2-4, pp. 111 – 132 (2006) © VSP 2006. Also available online - www.vsppub.com Neural adjustments to chromatic blur MICHAEL A. WEBSTER ∗ , YOKO MIZOKAMI, LEEDJIA A. SVEC and SARAH L. ELLIOTT Department of Psychology, University of Nevada, Reno, Nevada NV 89557, USA Received 20 November 2004; accepted 18 June 2005 Abstract —The perception of blur in images can be strongly affected by prior adaptation to blurry images or by spatial induction from blurred surrounds. These contextual effects may play a role in calibrating visual responses for the spatial structure of luminance variations in images. We asked whether similar adjustments might also calibrate the visual system for spatial variations in color. Observers adjusted the amplitude spectra of luminance or chromatic images until they appeared correctly focused, and repeated these measurements either before or after adaptation to blurred or sharpened images or in the presence of blurred or sharpened surrounds. Prior adaptation induced large and distinct changes in perceived focus for both luminance and chromatic patterns, suggesting that luminance and chromatic mechanisms are both able to adjust to changes in the level of blur. However, judgments of focus were more variable for http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Spatial Vision (continued as Seeing & Perceiving from 2010) Brill

Neural adjustments to chromatic blur

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Publisher
Brill
Copyright
© 2006 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0169-1015
eISSN
1568-5683
D.O.I.
10.1163/156856806776923380
Publisher site
See Article on Publisher Site

Abstract

Spatial Vision , Vol. 19, No. 2-4, pp. 111 – 132 (2006) © VSP 2006. Also available online - www.vsppub.com Neural adjustments to chromatic blur MICHAEL A. WEBSTER ∗ , YOKO MIZOKAMI, LEEDJIA A. SVEC and SARAH L. ELLIOTT Department of Psychology, University of Nevada, Reno, Nevada NV 89557, USA Received 20 November 2004; accepted 18 June 2005 Abstract —The perception of blur in images can be strongly affected by prior adaptation to blurry images or by spatial induction from blurred surrounds. These contextual effects may play a role in calibrating visual responses for the spatial structure of luminance variations in images. We asked whether similar adjustments might also calibrate the visual system for spatial variations in color. Observers adjusted the amplitude spectra of luminance or chromatic images until they appeared correctly focused, and repeated these measurements either before or after adaptation to blurred or sharpened images or in the presence of blurred or sharpened surrounds. Prior adaptation induced large and distinct changes in perceived focus for both luminance and chromatic patterns, suggesting that luminance and chromatic mechanisms are both able to adjust to changes in the level of blur. However, judgments of focus were more variable for

Journal

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

Published: Jan 1, 2006

Keywords: COLOR; ADAPTATION; CONTRAST SENSITIVITY; BLUR

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