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  • Title: Perceptual learning modulates electrophysiological and psychophysical response to visual texture segmentation in humans.
    Author: Casco C, Campana G, Grieco A, Fuggetta G.
    Journal: Neurosci Lett; 2004 Nov 16; 371(1):18-23. PubMed ID: 15500959.
    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.
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