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Related Experiment Videos

Specialized neural systems underlying representations of sequential movements.

D L Harrington1, S M Rao, K Y Haaland

  • 1Psychology Service 116B, Veterans Affairs Medical Center, 1501 San Pedro SE, Albequerque, NM 87108, USA. j613@unm.edu

Journal of Cognitive Neuroscience
|April 19, 2000
PubMed
Summary

This study reveals distinct brain systems for processing movement sequence complexity. Different neural networks handle surface features versus abstract relationships in skilled actions.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Motor Control

Background:

  • Skilled actions involve combining movements, with complexity influenced by sequence structure.
  • Understanding distinct neural systems for different structural properties of sequential actions is unclear.

Purpose of the Study:

  • To investigate whether different neural systems support cognitive and sensorimotor processes for distinct structural properties of sequential actions.
  • To differentiate neural correlates of surface structure versus sequence-specific structure in movement planning.

Main Methods:

  • Whole-brain functional magnetic resonance imaging (fMRI) in healthy adults.
  • Participants performed five-key press sequences with varying numbers of fingers (surface structure) and transitions (sequence-specific structure).

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  • Analysis correlated brain activation with sequence structure parameters.

    • Main Results:

    • Visual processing and sensory preparation areas (extrastriate cortex, rostral inferior parietal, ventral premotor cortex) correlated with both surface and sequence-specific structures.
    • Surface structure (number of fingers) correlated with cerebellum and superior parietal cortex activation (sensorimotor and kinematic representations).
    • Sequence-specific structure (number of transitions) correlated with inferior parietal cortex, dorsal premotor cortex (PMd), and frontotemporal networks, suggesting abstract action plan retrieval.

    Conclusions:

    • Distinct distributed neural systems differentiate the surface and sequence-specific structures of sequential movements.
    • These findings suggest specialized brain networks support the underlying mental operations for different aspects of movement sequence complexity.
    • The dorsal premotor cortex (PMd) plays a role in preparing abstract action plans based on sequence transitions.