Information-based rhythmic transcranial magnetic stimulation to accelerate learning during auditory working memory...

Area of Science:

• Neuroscience
• Cognitive Science
• Brain Stimulation

Background:

• Rhythmic transcranial magnetic stimulation (rhTMS) can enhance auditory working memory (aWM) by modulating theta oscillations in the dorsal auditory pathway.
• The persistence, learning acceleration, and cumulative effects of rhTMS on aWM remain under investigation.
• The left intraparietal sulcus (IPS) is a key region for working memory manipulation.

Purpose of the Study:

• To investigate the lasting behavioral and electrophysiological effects of rhTMS applied over the left IPS during cognitive training for aWM.
• To determine if rhTMS can accelerate learning and if its effects accumulate over multiple sessions.
• To assess the persistence of rhTMS-induced enhancements in aWM performance and neural activity.

Main Methods:

• 14 healthy participants underwent cognitive training on an aWM task.
• Participants received either theta (5 Hz) rhTMS or sham TMS over the left IPS.
• Electroencephalography (EEG) was recorded before, during, and after training to assess behavioral performance and neural oscillations.

Main Results:

• Combined rhTMS and cognitive training enhanced theta oscillatory activity in the fronto-parietal network and improved aWM performance.
• rhTMS accelerated cognitive training compared to sham stimulation, with benefits lasting approximately 3 days post-training.
• Increased theta oscillatory power in the dorsal auditory network and sustained EEG changes were observed up to 3 days after stimulation.

Conclusions:

• This study provides proof of concept for rhTMS as a method to enhance aWM and accelerate cognitive training.
• The findings suggest that rhTMS-induced improvements in aWM can be long-lasting.
• Preliminary data support the development of optimized rhTMS protocols for clinical applications in populations with cognitive deficits.