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Perceptual learning modulates electrophysiological and psychophysical response to visual texture segmentation in humans

Casco, C; Campana, G; Grieco, A; Fuggetta, G; (2004) Perceptual learning modulates electrophysiological and psychophysical response to visual texture segmentation in humans. Neuroscience letters , 371 (1) pp.18 - 23.

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Abstract

We investigated the mechanisms that allow, via perceptual learning, selective modulation of a visual line-texture figure saliency in accordance with task relevance. Learning-dependent saliency increase was inferred by increased accuracy in orientation discrimination with task repetition. As a result of learning, accuracy increase was more pronounced when local and global orientation of the texture figure conflicted, and reached ceiling in both conflict and conflict-free conditions. This psychophysical effect was associated with a decrease in amplitude of negative VEP components in the configurations where global and local orientation conflicted, and to a weak increase of VEP's earliest negative component in the conflict-free condition. The VEP result is a direct demonstration that learning, in addition to increasing response of relevant channels, also reduces the weight of channels whose receptive field size and orientation tuning conflict with the task.

Type:Article
Title:Perceptual learning modulates electrophysiological and psychophysical response to visual texture segmentation in humans
Additional information:Imported via OAI, 7:29:01 26th Jun 2007
UCL classification:UCL > School of Life and Medical Sciences > Faculty of Brain Sciences > Psychology and Language Sciences (Division of) > Institute of Cognitive Neuroscience
UCL > School of Life and Medical Sciences > Faculty of Life Sciences

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