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 journalArticlepeer-review


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 languageEnglish
Pages (from-to)18-23
Number of pages6
JournalNeuroscience letters
Issue number1
Publication statusPublished - 16 Nov 2004


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

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