Using Operant Reach Chambers to Assess Mouse Skilled Forelimb Use After Stroke

Area of Science:

• Neuroscience
• Behavioral Neuroscience
• Motor Control

Background:

• Skilled forelimb reaching and grasping are crucial for rodent motor performance.
• The isometric pull task is valuable for quantifying forelimb function after central nervous system (CNS) injury and in rehabilitation.
• Existing methods are well-established in rats, but a standardized approach for mice is needed.

Purpose of the Study:

• To describe the setup and training methods for an operant reach chamber specifically designed for mice.
• To establish a reliable protocol for assessing forelimb motor function in mice using an operant task.

Main Methods:

• Mice were adaptively trained to pull a handle outside an operant chamber using peanut oil as a reward.
• Automated recording systems were implemented to track key performance metrics.
• Key metrics include the number of attempts, force generated, success rate, and latency to maximal force.

Main Results:

• The described methods facilitate the setup and training of mice in an operant reach chamber.
• Automated recording captures quantitative data on forelimb motor performance.
• This system allows for precise measurement of force, latency, and success rates.

Conclusions:

• The operant reach chamber provides a standardized and quantifiable method for assessing mouse forelimb function.
• This technique is suitable for studying motor deficits following CNS injury and evaluating rehabilitation strategies in mice.
• This method advances the study of rodent motor control and recovery.