Spectrotemporal content of human auditory working memory represented in functional connectivity patterns.

Area of Science:

• Neuroscience
• Cognitive Science
• Neuroimaging

Background:

• Working memory (WM) is crucial for cognition, involving a mental sketchpad.
• Evidence indicates WM relies on multiple distributed brain regions.
• It remains unclear if WM representations are distributed across these regions.

Purpose of the Study:

• To investigate if working memory content is specifically encoded in functional connectivity patterns between brain regions.
• To determine if these connectivity patterns are distributed across frontal, parietal, and temporal cortices.

Main Methods:

• Functional magnetic resonance imaging (fMRI) data was collected during an auditory WM task.
• Connectivity-pattern matrices between cortical regions-of-interest (ROIs) were analyzed for content specificity.
• Permutation tests were used to assess statistical significance of decoding results.

Main Results:

• Maintained auditory items in WM were successfully decoded from connectivity patterns across frontal, parietal, and superior temporal cortices.
• Content-specific functional connectivity patterns extended from auditory to frontoparietal areas.
• Decoding was significant compared to a null distribution from permutation testing.

Conclusions:

• Working memory maintenance is supported by content-specific functional connectivity.
• These patterns are distributed across multiple cortical levels, from auditory to frontoparietal regions.
• This provides evidence for distributed representations in working memory.