Related Experiment Video
Updated: Jul 3, 2026
A Wireless, Bidirectional Interface for In Vivo Recording and Stimulation of Neural Activity in Freely Behaving Rats
Published on: November 7, 2017
A Low-Cost Wearable TI-TACS Stimulator With Bipolar Quadratic-Boost Converter for Current Stimulation Validation in
Objective:
Temporal interference transcranial alternating-current stimulation (TI-tACS) enables non-invasive deep brain neuromodulation but requires bulky, expensive equipment. This work presents an integrated wearable TI-tACS device addressing these barriers.
Methods:
A battery-powered system (55$\times 40\times$25 mm) featuring a quadratic-boost converter generates bipolar $\pm$15 V from 3.7 V battery at moderate duty cycles ($D$=0.55-0.68). Validation included electrical equivalent-load testing, electromagnetic modeling, saline phantom measurements, and proof-of-concept in vivo measurements in rats ($N$=5).
Results:
The proposed device achieves >50× volume reduction compared to existing TI-tACS implementations, with ${\$}$300 USD cost, 1.25% mean current error, and 0.28% mean THD. Phantom measurements matched simulations. Proof-of-concept in-vivo measurements demonstrated depth-dependent electric-field distributions containing both carrier-frequency and beat-frequency spectral components in rat brain tissue.
Conclusion:
The system successfully delivers TI-tACS waveforms and demonstrates interference field generation in biological tissue.
Significance:
This compact, affordable platform addresses critical hardware accessibility gaps, providing a foundation for preclinical TI-tACS research and enabling portable experimental paradigms.
