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Detection of symmetry and anti-symmetry : what they might reveal about visual nonlinearities

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Detection of symmetry and anti-symmetry : what they might reveal about visual nonlinearities

Mancini, Sandra (2004) Detection of symmetry and anti-symmetry : what they might reveal about visual nonlinearities. Masters thesis, Concordia University.

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Abstract

The detection of symmetry and anti-symmetry was investigated by manipulating check size, spatial frequency, grey scale range and eccentricity. Sensitivity to symmetrical stimuli was only modestly affected by these manipulations. The most interesting findings were from anti-symmetrical stimuli. For the anti-symmetrical binary scale stimuli low thresholds were found but these increased to undetectable levels as check size decreased. The high-pass filtering of binary displays only modestly affected performance for anti-symmetrical stimuli; however, the low-pass filtering of these stimuli greatly impaired performance. Increasing the grey scale range of the stimuli led to the undetectability of anti-symmetry. When stimuli with black and white checks were moved from fixation to 8{493} in the periphery, performance was greatly impaired for anti-symmetrical stimuli. A single model employing a full or half wave rectification would not be able to account for such divergent results.

Divisions:Concordia University > Faculty of Arts and Science > Psychology
Item Type:Thesis (Masters)
Authors:Mancini, Sandra
Pagination:vi, 63 leaves : ill. ; 29 cm.
Institution:Concordia University
Degree Name:M.A.
Program:Psychology
Date:2004
Thesis Supervisor(s):Gurnsey, Rick
ID Code:8050
Deposited By:Concordia University Libraries
Deposited On:18 Aug 2011 14:14
Last Modified:19 Aug 2011 03:54
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