Detection of shape in radial frequency contours: Independence of local and global form information

Jason Bell, David Badcock, H. Wilson, F. Wilkinson

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)

Abstract

Radial frequency (RF) patterns have been used to study the processes involved in shape perception. The psychophysical literature suggests that there are distinct global and local shape detection processes for low and high radial frequency patterns, but this has not been tested in a combined contour pattern, such as would be needed to describe the contours of most natural objects. Here, we combined frequencies from the local and global range onto a compound RE structure. Observers' ability to detect a single RE component on the compound pattern was measured. Results show that sensitivity to high frequency local deviations in shape was not affected by the presence of a globally perceived low frequency pattern. In the reverse condition, detection of global form was not influenced by adding local deviations onto the structure. This suggests that local and global shape information can be detected independently within the human visual system. (C) 2007 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)1518-1522
JournalVision Research
Volume47
Issue number11
DOIs
Publication statusPublished - 2007

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