Separate first- and second-order processing is supported by spatial summation estimates at the fovea and eccentrically

Subash Sukumar, Sarah J. Waugh

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

We estimated spatial summation areas for the detection of luminance-modulated (LM) and contrast-modulated (CM) blobs at the fovea, 2.5, 5 and 10 deg eccentrically. Gaussian profiles were added or multiplied to binary white noise to create LM and CM blob stimuli and these were used to psychophysically estimate detection thresholds and spatial summation areas. The results reveal significantly larger summation areas for detecting CM than LM blobs across eccentricity. These differences are comparable to receptive field size estimates made in V1 and V2. They support the notion that separate spatial processing occurs for the detection of LM and CM stimuli.

Original languageEnglish
Pages (from-to)581-596
Number of pages16
JournalVision Research
Volume47
Issue number5
Early online date1 Feb 2007
DOIs
Publication statusPublished - 1 Mar 2007
Externally publishedYes

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