Comparative Effects of Temporal Interference and High-Definition Transcranial Direct Current Stimulation on...

Area of Science:

• Neuroscience
• Brain Stimulation
• Neurological Disorders

Background:

• Modulating spontaneous neuronal activity is key for understanding and treating neurological disorders.
• Comparative effects of non-invasive brain stimulation techniques are not well understood.

Purpose of the Study:

• Systematically compare temporal interference (TI) stimulation and high-definition transcranial direct current stimulation (HD-tDCS).
• Assess their effects on spontaneous neuronal activity in the primary motor cortex.

Main Methods:

• Randomized, crossover design with 40 participants.
• 20-minute sessions of TI or HD-tDCS.
• Resting-state fMRI analyzed for ReHo, dReHo, fALFFs, and dfALFFs.

Main Results:

• TI significantly impacted ReHo in the superior temporal and postcentral gyri more than HD-tDCS.
• Both methods showed peak effects during stimulation, but only TI had sustained post-stimulation activity.
• TI and HD-tDCS enhanced fALFFs in real-time, with TI showing stronger sensorimotor effects.

Conclusions:

• TI exerts a more potent and sustained influence on spontaneous neuronal activity compared to HD-tDCS.
• Findings offer insights for optimizing non-invasive brain stimulation protocols for therapeutic applications.