Mobile Wireless Low-intensity Transcranial Ultrasound Stimulation System for Freely Behaving Small Animals.

Area of Science:

• Neuroscience
• Biomedical Engineering
• Medical Devices

Background:

• Transcranial ultrasound stimulation (tUS) is a noninvasive brain modulation technique.
• Current pre-clinical research using tUS is limited by the need for anesthetized or immobilized animal models.
• Anesthesia and immobilization restrict natural behaviors, hindering studies on tUS effects.

Purpose of the Study:

• To develop a portable, low-cost, wireless system for tUS in freely behaving animals.
• To overcome the limitations of conventional tUS methods in pre-clinical research.
• To enable naturalistic investigation of tUS effects on brain circuits and behavior.

Main Methods:

• A wireless tUS system was engineered using a 16 MHz microcontroller and amplifier.
• A 5mm PZT transducer generated focused ultrasound at 450 kHz with 426 kPa peak pressure.
• The 20g system was mounted on freely moving rats, allowing unimpeded motion.

Main Results:

• The wireless tUS system successfully stimulated the motor cortex in freely behaving rats.
• A robust ear movement response was observed, indicating effective brain modulation.
• The system demonstrated the feasibility of wireless tUS for behavioral studies.

Conclusions:

• The developed wireless tUS system facilitates pre-clinical research in naturalistic settings.
• This technology enables the study of tUS effects on behavior in freely moving animals.
• The portable system supports future chronic studies and a deeper understanding of tUS applications.