Enhanced focality and intensity in deep brain targeting: In silico study on multi-channel temporal interference...

This study introduces a novel multi-channel temporal interference stimulation (M-TIS) paradigm and rigorously evaluates its capacity to non-invasively target the globus pallidus internus (GPi), a pivotal region in Parkinson's disease (PD) treatment. Employing realistic human head models derived from MRI data and sophisticated finite element modeling, we demonstrate that M-TIS achieves significantly enhanced stimulation intensity and focality within the GPi compared to conventional single-channel transcranial alternating current stimulation (tACS), multi-channel tACS (M-tACS), and conventional temporal interference stimulation (TIS). Specifically, M-TIS yields an average electric field intensity of 0.58 V/m in the GPi, surpassing the intensities achieved by tACS (0.27 V/m), M-tACS (0.38 V/m), and TIS (0.48 V/m). The observed increase in modulation amplitude and spatial gradient with M-TIS suggests improved stimulation efficiency and precision, critical factors for effective neuromodulation. These findings establish a robust foundation for future clinical translation and optimization of M-TIS protocols, highlighting its potential as a compelling non-invasive alternative to deep brain stimulation and offering a promising strategy to improve therapeutic outcomes for PD patients.