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Related Experiment Videos

Agnosia.

M J Farah1

  • 1Department of Psychology, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213.

Current Opinion in Neurobiology
|April 1, 1992
PubMed
Summary

Brain damage can impair object recognition, leading to various agnosias. Studies reveal specialized processing for different stimuli and distinct neural pathways for recognition and awareness.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Object recognition deficits, known as agnosias, occur following brain damage.
  • Agnosias offer insights into the mechanisms of normal object recognition.

Purpose of the Study:

  • To explore the constraints agnosias place on theories of normal object recognition.
  • To investigate the division of labor in recognizing diverse stimuli.
  • To examine the interactivity of object recognition processes.

Main Methods:

  • Analysis of patient data with various forms of agnosia.
  • Review of recent studies on object recognition deficits.
  • Theoretical modeling of recognition processes.

Main Results:

  • Evidence suggests specialized brain regions for recognizing common objects, words, faces, eye gaze, and body parts.
  • Object recognition involves highly interactive processing stages.
  • Recognition and awareness of recognition may be dissociable neural processes.

Conclusions:

  • Agnosias provide critical constraints for understanding normal object recognition.
  • Object recognition is a complex process involving specialized, interactive neural systems.
  • The separation of recognition and awareness suggests distinct neural substrates.

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