Decoding auditory working memory content from EEG responses to auditory-cortical TMS

Area of Science:

• Neuroscience
• Cognitive Science
• Brain Imaging

Background:

• Working memory (WM) is crucial for goal-directed behavior and cognitive functions.
• A key theory suggests WM content is maintained in short-term, activity-silent synaptic states.
• Detecting these activity-silent states is challenging but vital for understanding cognition.

Purpose of the Study:

• To investigate the role of activity-silent brain states in working memory maintenance.
• To determine if external stimuli can reveal information stored in these silent states.
• To identify specific brain regions involved in activity-silent working memory.

Main Methods:

• Utilized single-pulse transcranial magnetic stimulation (spTMS) as an impulse stimulus.
• Employed electroencephalography (EEG) to record brain activity.
• Applied multivariate pattern analysis (MVPA) with non-parametric permutation testing for decoding WM content.

Main Results:

• Decoding accuracy of WM content significantly improved after spTMS.
• spTMS delivered to the posterior superior temporal cortex enhanced decoding.
• The findings support the hypothesis that WM involves activity-silent states.

Conclusions:

• Working memory maintenance involves brain states that are relatively silent concerning intrinsic neural activity.
• External impulse stimuli, like spTMS, can probe and reveal information within these activity-silent states.
• The posterior superior temporal cortex plays a role in maintaining information in activity-silent WM states.