Non-invasive primate head restraint using thermoplastic masks.

Area of Science:

• Neuroscience
• Primate research
• Animal behavior studies

Background:

• Effective head fixation is crucial for neuroscientific studies involving awake, behaving animals.
• Traditional methods often involve surgically implanted head-restraint prostheses.

Purpose of the Study:

• To introduce and evaluate thermoplastic masks as a non-invasive method for primate head restraint.
• To compare the efficacy of thermoplastic masks with traditional head-posts in neuroscientific applications.

Main Methods:

• Thermoplastic mesh sheets were heated, molded to individual monkey heads, and allowed to cool, creating custom masks.
• Rhesus macaques were trained to perform cognitive tasks while wearing the masks.

Main Results:

• The thermoplastic masks provided sufficient head stability for high-resolution eye-tracking and intracranial electrophysiology.
• Monkeys successfully performed cognitive tasks while wearing the masks.

Conclusions:

• Thermoplastic masks are a viable, non-invasive alternative to traditional head-posts for primate head restraint.
• This method offers comparable or superior performance in various neuroscientific techniques, including eye-tracking and electrophysiology.
• The masks reduce costs and time, and allow for clearer imaging and greater flexibility in stimulation coil placement.