Transcranial Alternating Current Stimulation (tACS) as a Tool to Modulate P300 Amplitude in Attention Deficit...

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neuromodulation

Background:

• Attention deficit/hyperactivity disorder (ADHD) is associated with reduced P300 event-related potential (ERP) amplitude, linked to cognitive deficits in attention and resource allocation.
• Transcranial alternating current stimulation (tACS) can modulate endogenous brain oscillations, potentially increasing ERP amplitudes like P300.

Purpose of the Study:

• To investigate the efficacy of tACS in increasing P300 amplitude in adult ADHD patients.
• To assess the impact of tACS-induced P300 amplitude changes on cognitive performance, specifically omission errors.

Main Methods:

• A pilot study involving 18 adult ADHD patients (7 female) performing a visual oddball task.
• Electroencephalogram (EEG) recorded during three blocks of task performance.
• Participants received either 20 minutes of tACS (1 mA intensity) or sham stimulation, with individual stimulation frequency determined by P300 time-frequency analysis.

Main Results:

• A significant increase in P300 amplitude was observed in the tACS group compared to sham.
• The increase in P300 amplitude correlated with a reduction in omission errors following tACS.
• Preliminary findings suggest tACS may enhance cognitive control in ADHD.

Conclusions:

• tACS is a potential neuromodulatory tool for addressing cognitive deficits in ADHD by increasing P300 amplitude.
• The observed reduction in errors suggests improved attentional processing post-tACS.
• Further research with larger sample sizes is recommended to confirm these preliminary findings.