A ‘first stage’ central performance drop in a Gabor luminance-modulation detection task

Language
en
Document Type
Article
Issue Date
2013-04-24
Issue Year
2006
Authors
Kehrer, Lothar
Meinecke, Cristina
Editor
Abstract

In an experiment, 20 participants had to detect a backward masked Gabor luminance-modulation target imposed on a field of uniform luminance at varying eccentricities along the horizontal meridian. Different spatial frequencies were used as target modulations. Results for a 7.0 c/deg target patch showed peak detection performance at the center of the visual field and a steady decrease toward the periphery. For 1.0 c/deg, 0.75 c/deg, and 0.5 c/deg target patches, in contrast, the peak was several degrees off retinal center and decreased steadily toward the center. Findings not only confirmed the familiar sensitivity loss toward peripheral areas for high spatial frequencies, but also indicated a sensitivity loss toward central areas for low spatial frequencies. It is concluded that they further support Gurnsey et al.’s (1996) ‘mismatch hypothesis’ extending its scope to also include ‘first-stage’ stimuli.

Journal Title
Spatial Vision 19.5 (2006): S. 427-437. <http://booksandjournals.brillonline.com/content/10.1163/156856806778457359>
Citation
Spatial Vision 19.5 (2006): S. 427-437. <http://booksandjournals.brillonline.com/content/10.1163/156856806778457359>
DOI
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