The Gollin incomplete figure test as a masking problem

Chikhman, V. N. and Foreman, Nigel and Merkuliev, A. and Shelepin, Yuri and Krasilnikov, N. (2002) The Gollin incomplete figure test as a masking problem. Perception, 31 . ISSN 0301-0066

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Abstract

The Gollin test of incomplete figure perception is usually employed to measure the thresholds
of recognition in children and adults, and to study a process which provides a basis for the
perception of incomplete figures as Gestalts (Foreman and Hemmings, 1987 Perception 16
543 ^ 548). Here we suggest that this testöalong with such tests as the Poppelreuter test of figure
extraction, and the Mooney faces testömay be considered as a visual masking problem. Digital
image processing allows us to measure the spatial properties and spatial-frequency spectrum of
the absent part of the image as a mask. We compare incomplete masking with other traditional
types of masking. Using a noise paradigm, we have measured the signal-to-noise ratio for incom-
plete figure perception in normal participants and in neurological patients. This is the most
powerful aspect of this new approach. Clinically, the new paradigm may provide a quantitative
measure of agnosia. We have developed the hypothesis that some forms of visual agnosia arise
primarily from an especially high level of noise within higher visual processing, including memory
systems. We classify this type of agnosia as `filtration agnosia'. The concept of incomplete figure
perception as noise filtration is therefore important for clinical purposes.

Item Type: Article
Additional Information: European Conference on Visual Perception. Glasgow, UK. 25-29 August 2002.
Research Areas: A. > School of Health and Education
Item ID: 3362
Useful Links:
Depositing User: Devika Mohan
Date Deposited: 04 Dec 2009 05:56
Last Modified: 05 Oct 2015 15:54
URI: http://eprints.mdx.ac.uk/id/eprint/3362

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