Distributed patterns of occipito-parietal functional connectivity predict the precision of visual working memory

Area of Science:

• Cognitive Neuroscience
• Neuroimaging
• Psychology

Background:

• Limitations in visual working memory (WM) quality, or precision, may stem from perceptual and attentional encoding constraints.
• Individual differences in WM capacity are potentially linked to the interaction quality between sensory processing and fronto-parietal control regions.

Purpose of the Study:

• To investigate the hypothesis that the coupling between perceptual and attentional systems influences the quality of visual working memory encoding.
• To explore the relationship between functional connectivity during WM encoding and behavioral measures of WM precision and capacity.

Main Methods:

• Employed functional magnetic resonance imaging (fMRI) connectivity analysis combined with behavioral modeling using a variable precision and fixed capacity model.
• Participants performed a visual delayed continuous response working memory task.
• Quantified functional connectivity during WM encoding between occipital and parietal regions identified through conjunction analysis of perception and WM tasks.

Main Results:

• Multivariate voxel-wise inter-areal functional connectivity during WM encoding significantly predicted WM performance.
• Higher occipito-parietal functional connectivity was specifically associated with increased mean working memory precision, not the number of stored items.
• Results support a network perspective where information flow efficiency between perceptual and attentional systems dictates WM quality.

Conclusions:

• The efficiency of neural information flow between perceptual and attentional systems is a key determinant of visual working memory precision.
• Findings suggest that limitations in WM quality are linked to the functional coupling within fronto-parietal networks during encoding.