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Encoding of temporal intervals in the rat hindlimb sensorimotor cortex.

Eric B Knudsen1, Robert D Flint, Karen A Moxon

  • 1School of Biomedical Engineering Science and Health Systems, Drexel University Philadelphia, PA, USA.

Frontiers in Systems Neuroscience
|October 12, 2012
PubMed
Summary

Neural activity patterns called climbing activity encode time intervals. This study found that interval-trained rats scale climbing activity to encode press duration, unlike non-interval-trained rats.

Keywords:
encodinghindlimbratsensorimotor cortextemporal intervals

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Area of Science:

  • Neuroscience
  • Motor Control
  • Time Perception

Background:

  • Climbing activity, a gradual neural buildup during delay periods, is a proposed mechanism for encoding interval time in cortico-thalamico-striatal networks.
  • This activity has been observed to scale with delay periods, but its presence and function in hindlimb motor cortex remain unclear.
  • The impact of behavioral training, specifically with varying reward conditions but similar motor output, on these neural patterns is not well understood.

Purpose of the Study:

  • To investigate the presence and temporal scaling of climbing activity in the hindlimb sensorimotor cortex (HLSMC).
  • To determine the effects of interval training versus non-interval training on climbing activity during a skilled motor task.
  • To assess whether climbing activity encodes press duration in relation to behavioral training.

Main Methods:

  • Recorded neural activity from the HLSMC of rats performing a skilled hindlimb press task.
  • Compared two groups: interval-trained (IT) rats requiring duration-specific presses for reward and non-interval-trained (nIT) rats rewarded for valid presses within a time window.
  • Utilized perievent time histogram (PETH) analysis and single-trial decoding (Wiener filter) to analyze climbing activity and its correlation with press duration.

Main Results:

  • Both IT and nIT rats exhibited climbing activity during the task (35% IT, 47% nIT).
  • Only climbing activity in IT rats was temporally scaled to match the press duration.
  • Press duration was decoded more accurately from climbing activity in IT rats (R=0.61) compared to nIT rats (R=0.507), indicating duration encoding.

Conclusions:

  • Climbing activity is present in the HLSMC and its temporal scaling is influenced by behavioral training.
  • When temporal intervals are behaviorally relevant (as in IT training), climbing neural activity is temporally scaled to encode the passage of time and specific durations.
  • This suggests a mechanism by which the brain utilizes climbing activity for precise temporal encoding in motor tasks.