Psychophysical evidence for interactions between visual motion and form processing at the level of motion integrating receptive fields

Mather, George and Pavan, Andrea and Bellacosa, Rosilari M. and Casco, Clara (2012) Psychophysical evidence for interactions between visual motion and form processing at the level of motion integrating receptive fields. Neuropsychologia, 50 (1). pp. 153-159. ISSN 0028-3932

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Psychophysical evidence for interactions between visual motion and form processing at the level of motion integrating receptive fields
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Official URL: http://dx.doi.org/10.1016/j.neuropsychologia.2011....

Abstract

Recent physiological and psychophysical research has challenged the traditional view that motion
and form information are processed in distinct, parallel pathways in the visual system. Rapid movement creates ‘motion-streaks’ parallel to the motion trajectory, which facilitate motion detection. Some motion-selective neurons in striate and extrastriate cortex are sensitive to motion parallel to their preferred orientation, a possible neural substrate of motion-streak effects. As a psychophysical test of the cortical site of motion–form interactions, four experiments measured the duration and direction of the motion after-effect (MAE) generated by drifting dot fields in the presence of either vertical, horizontal or oblique counter-phase pedestal gratings. In Experiment 1 a single, horizontally drifting dot field was used; motion streak interactions predict stronger after-effects for horizontal gratings. Experiment 2 employed
two transparently drifting dot fields (obliquely upwards and downwards), which produce a horizontal MAE. If motion–form interactions depend only on individual dot field trajectory, there should be no effect of grating orientation on MAEs after bi-directional adaptation. MAEs from both uni-directional and bidirectional adaptation were stronger using horizontal gratings than using vertical gratings. Experiments 3 and 4 found that an oblique pedestal did not alter the apparent direction of the MAE from bi-directional motion, despite the fact that it reduced MAE duration compared to a parallel pedestal. These results provide new evidence that the strength of adaptation to motion is affected by simultaneously presented
orientation signals, and implicate motion integrating receptive fields in extrastriate cortex as the likely
neural locus of this motion–form interaction.

Item Type:Article
Keywords:Motion-streaks, Motion-aftereffect, Transparent motion, Normalization
Subjects:C Biological Sciences > C800 Psychology
C Biological Sciences > C850 Cognitive Psychology
C Biological Sciences > C860 Neuropsychology
Divisions:College of Social Science > School of Psychology
ID Code:4862
Deposited By: Alison Wilson
Deposited On:13 Jan 2012 14:12
Last Modified:04 Dec 2013 14:41

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