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Reaching behavior in the rat: absence of forelimb peripheral input
M Saling1, T Sitárová, R Vejsada
1Institute of Normal and Pathological Physiology, Slovak Academy of Sciences, Bratislava.
Physiology & Behavior
|June 1, 1992
Summary
Peripheral somatosensory feedback is not essential for initiating reaching movements in rats. However, this sensory input is crucial for effective grasping and fine-tuning reaching execution.
Area of Science:
- Neuroscience
- Motor Control
- Somatosensory System
Background:
- Understanding the role of sensory feedback in motor control is fundamental to neuroscience.
- The contribution of peripheral input from the forelimb to reaching and grasping behaviors remains an area of active investigation.
Purpose of the Study:
- To investigate the necessity of peripheral input from a moving forelimb for successful reaching and grasping in rats.
- To determine if somatosensory feedback is essential for the initiation, execution, and modulation of reaching movements.
Main Methods:
- Rats were trained to perform reaching tasks.
- Bilateral dorsal rhizotomy (C5-Th2) was performed to deafferent the forelimbs.
- Reaching attempts were monitored using magnetic induction recording before and after deafferentation.
Main Results:
- Deafferented rats could initiate and generate the motor program for reaching but lost modulation of ongoing execution.
- Peripheral input was necessary for effective grasping, leading to prolonged manipulative phases and decreased success rates.
- Forelimb aiming was impaired, likely due to disrupted postural coordination; forelimb protraction remained unaffected.
Conclusions:
- Somatosensory feedback is not required for the execution of forelimb protraction during reaching.
- Peripheral somatosensory input is essential for the successful performance of grasping and fine motor control during reaching.