Simultaneous Transcranial Alternating Current Stimulation and Functional Magnetic Resonance Imaging.

Area of Science:

• Neuroscience
• Brain Imaging Techniques
• Noninvasive Brain Stimulation

Background:

• Transcranial alternating current stimulation (tACS) is a key tool for studying brain oscillations noninvasively.
• Current understanding of tACS relies heavily on behavioral studies.
• Combining tACS with brain imaging is crucial for elucidating tACS mechanisms.

Purpose of the Study:

• To describe a safe and reliable setup for simultaneous tACS and functional magnetic resonance imaging (fMRI).
• To investigate the effects of tACS on brain activity during visual tasks.
• To enhance the understanding of oscillatory brain function and tACS modulation.

Main Methods:

• Development of a setup for simultaneous tACS and fMRI.
• Application of frequency-specific electrical stimulation via scalp electrodes.
• Utilizing fMRI to measure brain activity during tACS and visual tasks.

Main Results:

• Successfully combined tACS with simultaneous fMRI measurements.
• Demonstrated that tACS effects are dependent on stimulation state, current intensity, and frequency.
• Observed modulation of brain activity beyond the area directly beneath the tACS electrodes.

Conclusions:

• Simultaneous tACS-fMRI is a feasible and valuable approach for neuroscience research.
• tACS can modulate brain activity in a complex, non-localized manner.
• This technique advances the study of brain oscillations and tACS-induced neuroplasticity.