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Layer 5 Intratelencephalic Neurons in the Motor Cortex Stably Encode Skilled Movement.
Takanori Shinotsuka1, Yasuhiro R Tanaka1,2, Shin-Ichiro Terada1
1Department of Physiology, Graduate School of Medicine, University of Tokyo, Tokyo 113-0033, Japan.
Summary
Motor memory is retained by specific neurons in the primary motor cortex (M1) layer 5a (L5a) intratelencephalic (IT) neurons, even after periods of disuse. These neurons fine-tune skilled movements and ensure behavioral stability and adaptability.
Area of Science:
- Neuroscience
- Motor Control
- Learning and Memory
Background:
- The primary motor cortex (M1) and dorsal striatum are crucial for motor learning and memory.
- Layer 5a (L5a) intratelencephalic (IT) neurons in M1 connect to the dorsal striatum and are implicated in motor learning.
- It remains unclear if M1 L5a IT neurons retain motor memories after learning.
Purpose of the Study:
- To investigate whether M1 L5a IT neurons retain representations of well-learned motor skills.
- To determine the role of these neurons in maintaining and fine-tuning skilled movements.
Main Methods:
- Two-photon calcium imaging of striatum-projecting L5a IT neurons in M1 of Tlx3-Cre male transgenic mice.
- Behavioral testing during a self-initiated lever-pull task and after a 6-day non-training period.
- Inactivation of M1 IT neurons to assess their role in task performance.
Main Results:
- M1 L5a IT neurons strongly represented learned forelimb movements, not orofacial movements.
- A subset of these neurons consistently encoded the skilled movement before and after the non-training period.
- Inactivation of M1 IT neurons impaired performance on modified task conditions (increased load, narrowed target).
Conclusions:
- A subset of M1 L5a IT neurons continuously represent skilled movements post-learning.
- These neurons are vital for fine-tuning movement kinematics and ensuring behavioral stability and adaptability.
- M1 L5a IT neurons play a long-term role in motor memory retention and skilled movement execution.
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