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Parallel processing of serial movements in prefrontal cortex.

Bruno B Averbeck1, Matthew V Chafee, David A Crowe

  • 1Brain Sciences Center, Veterans Affairs Medical Center, Minneapolis, MN 55417, USA.

Proceedings of the National Academy of Sciences of the United States of America
|September 21, 2002
PubMed
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Neural representations of motor sequences exist before actions begin, supporting Lashley's serial order hypothesis. Neuronal activity patterns predict movement order and errors in monkeys copying shapes.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Behavioral Science

Background:

  • Lashley's problem of serial order posits pre-action neural representation of behavioral elements.
  • Understanding the neural basis of sequential behavior is crucial for cognitive neuroscience.

Purpose of the Study:

  • To investigate the neural representation of serial order in motor sequences before action execution.
  • To test Lashley's hypothesis regarding the neural basis of errors in sequential behavior.

Main Methods:

  • Simultaneous recording of neuronal ensemble activity in the prefrontal cortex of monkeys.
  • Monkeys copied geometrical shapes, generating sequences of movement segments.
  • Discriminant analysis assessed the strength of neuronal representation for each segment.

Related Experiment Videos

Main Results:

  • Distinct patterns of neuronal ensemble activity preceded the drawing of movement segments.
  • The strength of neuronal representation predicted the serial position of segments in the motor sequence.
  • Analysis of errors revealed neural correlates supporting Lashley's hypothesis on error prediction.

Conclusions:

  • Prefrontal cortex neuronal ensembles represent upcoming motor sequences before action initiation.
  • This neural coding provides a basis for understanding serial order in behavior and error generation.
  • Findings support Lashley's hypothesis on the neural representation of serial order.