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

Full text is not in this repository.

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:Middlesex University Schools and Centres > School of Health and Education > Health & Education
ID Code:3362
Useful Links:
Deposited On:04 Dec 2009 05:56
Last Modified:10 Jan 2014 05:56

Repository staff only: item control page

Full text downloads (NB count will be zero if no full text documents are attached to the record)

Downloads per month over the past year