Top-down reorganization of activity in the visual pathway after learning a shape identification task

Neuron. 2005 Jun 2;46(5):823-35. doi: 10.1016/j.neuron.2005.05.014.

Abstract

Learning in shape identification led to global changes in activation across the entire visual pathway, as revealed with whole-brain fMRI. Following extensive training in a shape identification task, brain activity associated with trained shapes relative to the untrained shapes showed: (1) an increased level of activity in retinotopic cortex (RC), (2) a decrease in activation of the lateral occipital cortex (LO), and (3) a decrease in the dorsal attentional network. In addition, RC activations became more correlated (and LO activation, less correlated) with performance. When comparing target-present and target-absent trials within the trained condition, we observed a similar decrease in the dorsal attentional network but not in the visual cortices. These findings indicate a large-scale reorganization of activity in the visual pathway as a result of learning, with the RC becoming more involved (and the LO, less involved) and that these changes are triggered in a top-down manner depending on the perceptual task performed.

Publication types

  • Comparative Study
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adult
  • Brain / physiology
  • Female
  • Humans
  • Learning / physiology*
  • Magnetic Resonance Imaging / methods
  • Male
  • Pattern Recognition, Visual / physiology*
  • Photic Stimulation / methods*
  • Psychomotor Performance / physiology*
  • Visual Pathways / physiology*