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In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA...
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Related Experiment Video

Updated: Jan 31, 2026

The "Motor" in Implicit Motor Sequence Learning: A Foot-stepping Serial Reaction Time Task
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Anticipatory activity in primary motor cortex codes memorized movement sequences.

Xiaofeng Lu1, James Ashe

  • 1Brain Sciences Center, Veterans Administration Medical Center, Minneapolis, Minnesota 55417, USA.

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Summary

Primary motor cortex cells in monkeys exhibit anticipatory activity for memorized movement sequences. Disrupting motor cortex function with muscimol increased sequence errors, challenging the role of medial motor areas in motor control.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Neuroscience

Background:

  • Movement sequences are crucial for motor behavior, with serial order encoded in medial motor areas.
  • The role of the primary motor cortex (M1) in encoding complex movement sequences is not fully understood.

Purpose of the Study:

  • To investigate the encoding of memorized movement sequences in the primary motor cortex.
  • To determine the causal role of the motor cortex in the production of sequenced movements.

Main Methods:

  • Recording neuronal activity in the primary motor cortex of monkeys performing memorized movement sequences.
  • Inhibiting motor cortex function using muscimol (a GABA agonist) and assessing its impact on sequence production and non-sequenced movements.

Main Results:

  • Identified cells in the primary motor cortex with anticipatory activity specific to memorized movement sequences.
  • Muscimol injection into the motor cortex significantly increased errors in sequence production but not in non-sequenced motor tasks.

Conclusions:

  • The primary motor cortex plays a significant role in the planning and execution of complex, well-practiced movement sequences.
  • Findings challenge the exclusive role of medial motor areas and suggest M1 contributes substantially to motor sequence control.