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

Clara Casco; Gianluca Campana; Alba Grieco; Giorgio Fuggetta

doi:10.1016/j.neulet.2004.08.005

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

Clara Casco, Gianluca Campana, Alba Grieco, Giorgio Fuggetta

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	18-23
Number of pages	6
Journal	Neuroscience letters
Volume	371
Issue number	1
DOIs	https://doi.org/10.1016/j.neulet.2004.08.005
Publication status	Published - 16 Nov 2004

Keywords

Discrimination Learning
Electroencephalography
Evoked Potentials, Visual
Humans
Orientation
Pattern Recognition, Visual
Photic Stimulation
Psychophysics
Visual Fields

Access to Document

10.1016/j.neulet.2004.08.005

Cite this

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title = "Perceptual learning modulates electrophysiological and psychophysical response to visual texture segmentation in humans",

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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T1 - Perceptual learning modulates electrophysiological and psychophysical response to visual texture segmentation in humans

AU - Casco, Clara

AU - Campana, Gianluca

AU - Grieco, Alba

AU - Fuggetta, Giorgio

PY - 2004/11/16

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N2 - 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.

AB - 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.

KW - Discrimination Learning

KW - Electroencephalography

KW - Evoked Potentials, Visual

KW - Humans

KW - Orientation

KW - Pattern Recognition, Visual

KW - Photic Stimulation

KW - Psychophysics

KW - Visual Fields

U2 - 10.1016/j.neulet.2004.08.005

DO - 10.1016/j.neulet.2004.08.005

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SP - 18

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JF - Neuroscience letters

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