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Reference frames for reach planning in macaque dorsal premotor cortex.

Aaron P Batista1, Gopal Santhanam, Byron M Yu

  • 1Department of Electrical Engineering and Neurosciences Program, Stanford University, Stanford, California 94305-4075, USA.

Journal of Neurophysiology
|June 22, 2007
PubMed
Summary
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The dorsal premotor cortex (PMd) helps transform visual target locations into motor commands for reaching. PMd neurons use various reference frames, including eye- and limb-centered, to guide movements.

Area of Science:

  • Neuroscience
  • Motor Control
  • Computational Neuroscience

Background:

  • Visually guided reaching requires transforming target information from a visual reference frame to a motor control signal.
  • The dorsal aspect of the premotor cortex (PMd) is a key brain region involved in this process.

Purpose of the Study:

  • To investigate the role of the dorsal premotor cortex (PMd) in reference frame transformations for reaching.
  • To understand how PMd neurons encode target locations relative to the eyes and limbs.

Main Methods:

  • Utilized chronically implanted electrode arrays in two Rhesus monkeys.
  • Recorded neural activity in the PMd during reaching tasks.

Main Results:

  • PMd neurons showed sensitivity to target locations in both eye-centered and limb-centered reference frames.

Related Experiment Videos

  • Some neurons encoded reach goals using a combination of eye and hand positions.
  • A subset of PMd neurons could not be clearly categorized into a single reference frame.

    • Conclusions:

    • The dorsal premotor cortex (PMd) plays a critical role in reference frame transformation for reaching.
    • PMd neurons exhibit diverse coding strategies, utilizing multiple reference frames to represent reach goals.
    • Further research is needed to fully characterize the neural representations within PMd, potentially involving intrinsic or complex reference frames.