Challenges of P300 Modulation Using Transcranial Alternating Current Stimulation (tACS)

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Brain Stimulation

Background:

• The P300 event-related potential (ERP) is linked to stimulus processing and attention.
• Event-related oscillations (EROs), particularly in delta and theta frequencies, are implicated in P300 generation.
• Transcranial Alternating Current Stimulation (tACS) can modulate brain oscillations.

Purpose of the Study:

• To investigate the feasibility of modulating P300 amplitude using tACS.
• To target individual EROs associated with P300 generation via frequency-specific tACS.
• To explore a novel electrode configuration for optimized current distribution in central-parietal regions.

Main Methods:

• Participants underwent tACS or sham stimulation during a visual oddball task.
• tACS was precisely timed to coincide with the expected P300 latency.
• A novel electrode configuration with two central-parietal electrode clusters was employed.

Main Results:

• No significant group difference in P300 amplitude was observed between tACS and sham conditions.
• Reaction times and event-related spectral perturbation (ERSP) at the stimulation frequency did not differ significantly.
• A statistically significant influence of tACS on P300 amplitude was not demonstrated.

Conclusions:

• The proposed method of using tACS to modulate EROs for P300 amplitude modulation requires further research.
• Despite non-significant results, the approach offers potential for future investigations into P300 and EROs.
• This study provides a novel approach and methodological considerations for applying tACS to ERO modulation.