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Acquisition of a High-precision Skilled Forelimb Reaching Task in Rats
Published on: June 22, 2015
Encoding of self-paced, repetitive forelimb movements in rat primary motor cortex
1Department of Health Science and Technology, Aalborg University, Aalborg, Denmark.
Summary
Detecting self-paced forelimb movements using primary motor cortex (M1) recordings in rats is possible. However, the significant number of repetitions needed limits its use in real-time neuroprosthetics.
Area of Science:
- Neuroscience
- Motor Control
- Brain-Computer Interfaces
Background:
- Multi-unit, intra-cortical recordings from the primary motor cortex (M1) offer insights into functional movement.
- Previous studies utilized these recordings for robotic arm control in rats and monkeys.
- M1 responses may vary based on the functional and behavioral context of intended movements.
Purpose of the Study:
- To investigate the effectiveness of encoding self-paced, repetitive forelimb movements in M1 multi-unit recordings.
- To assess the feasibility of using these recordings in freely moving, unconstrained rats.
Main Methods:
- Chronic implantation of 7-channel micro-wire arrays in the M1 of four rats.
- Training rats using psychophysical techniques to depress a response paddle for a food reward.
- Analysis of peri-event time histograms to identify pre-paddle neural activity.
Main Results:
- Statistically significant excitatory (24/49) and inhibitory (9/49) neural activity detected up to 200 ms before paddle hits.
- An average of 161±37 paddle hits were required to achieve statistically significant excitatory pre-paddle action (>95% confidence).
Conclusions:
- Self-paced forelimb movements can be detected in M1 multi-unit recordings.
- The high number of repetitions necessary for detection significantly hinders the efficacy of real-time cortical neuroprostheses.
