Probing the Link Between Perception and Oscillations: Lessons from Transcranial Alternating Current Stimulation.

Area of Science:

• Neuroscience
• Cognitive Science
• Sensory Perception

Background:

• Brain oscillations are crucial for perception, regulating neural communication by opening and closing time windows for neural spiking.
• Previous research primarily used electrophysiological methods to find correlations between brain oscillations and perception.
• Noninvasive brain stimulation techniques, like tACS, offer new ways to investigate the causal links between oscillations and perception.

Purpose of the Study:

• To review studies using tACS to explore the causal role of specific brain oscillatory frequencies in visual, auditory, and somatosensory perception.
• To synthesize current evidence on how tACS can establish causality between neural oscillations and perceptual processes.

Main Methods:

• Systematic review of studies employing transcranial alternating current stimulation (tACS).
• Analysis of tACS applications in visual, auditory, and somatosensory perception research.
• Focus on studies investigating the causal contribution of specific oscillatory frequencies (e.g., alpha, theta, gamma).

Main Results:

• Evidence supports a causal role for alpha and gamma oscillations in parieto-occipital regions for visual perception.
• Theta and gamma oscillations in auditory cortices are causally linked to auditory perception.
• Alpha oscillations play a role in sensory gating across both visual and somatosensory domains.

Conclusions:

• tACS is a valuable tool for establishing causal relationships between neural oscillations and perception.
• Further refinement of perceptual paradigms and individualized stimulation is needed for more precise research.
• The findings highlight the specific roles of alpha, theta, and gamma oscillations in different sensory modalities.