Orientation integration in detection and discrimination of contrast-modulated patterns

Mussap, Alexander Julien 2001, Orientation integration in detection and discrimination of contrast-modulated patterns, Vision research, vol. 41, no. 3, pp. 295-311, doi: 10.1016/S0042-6989(00)00260-1.

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Title Orientation integration in detection and discrimination of contrast-modulated patterns
Author(s) Mussap, Alexander JulienORCID iD for Mussap, Alexander Julien orcid.org/0000-0003-1290-3680
Journal name Vision research
Volume number 41
Issue number 3
Start page 295
End page 311
Publisher Pergamon
Place of publication Oxford, England
Publication date 2001
ISSN 0042-6989
Keyword(s) contrast-modulation
gabor patterns
Summary Orientation detection and discrimination thresholds were measured for Gabor ‘envelopes’ formed from contrast-modulation of luminance ‘carriers’. Consistent with previous research differences between carrier and envelope orientation had no effect on sensitivity to envelopes. Using plaid carriers in which the proportion of contrast modulation ‘carried’ by each plaid component was systematically manipulated, it was shown that this tolerance to carrier-envelope orientation difference reflects linear summation across orientation indicative of a single second-stage channel coding for contrast-defined structure. That contrast envelopes did not exhibit linear summation across spatial-frequency, nor across combinations of orientation and spatial-frequency differences, suggests that these second-order channels operate only within certain spatial scales. Using arrays of Gabor micropatterns as carriers in which the orientation distribution of the carriers was manipulated independently of the difference between envelope orientation and mean carrier orientation, it was further demonstrated that the locus of orientation integration must occur prior to envelope detection. In the context of two-stage models that incorporate a non-linearity between the stages, the pattern of results obtained is consistent with the operation of an orientation pooling process between first-stage and second-stage channels, analogous to having all filters of the first-stage feed into all filters of the second-stage within the same spatial-frequency band.
Language eng
DOI 10.1016/S0042-6989(00)00260-1
Field of Research 170112 Sensory Processes, Perception and Performance
Socio Economic Objective 970117 Expanding Knowledge in Psychology and Cognitive Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2001, Elsevier Science Ltd.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30001232

Document type: Journal Article
Collection: School of Psychology
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