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The relationship between working memory storage and elevated activity as measured with functional magnetic resonance
Adam C Riggall1, Bradley R Postle
1Department of Psychology, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA. riggall@wisc.edu
Summary
Sustained brain activity during working memory tasks may not reflect information storage. Instead, subtle neural patterns in visual cortex might encode task-relevant information, challenging traditional fMRI interpretations.
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
Background:
- Working memory relies on sustained neural activity for information retention.
- Functional magnetic resonance imaging (fMRI) commonly detects this elevated activity.
Purpose of the Study:
- To investigate whether sustained, elevated neural activity during working memory tasks directly reflects information storage.
- To explore alternative neural representations of working memory information.
Main Methods:
- Analysis of fMRI data from human participants performing a delayed recognition task.
- Application of the General Linear Model (GLM) and multivoxel pattern analysis (MVPA).
Main Results:
- GLM showed sustained activity in frontal and parietal regions, but MVPA could not decode stimulus information from these areas.
- MVPA successfully decoded stimulus information from posterior visual regions lacking sustained activity.
- Task instruction information, but not stimulus information, was decodable from frontal/parietal regions.
Conclusions:
- Elevated delay-period activity measured by fMRI may not solely represent stimulus information storage.
- Short-term information storage might be encoded in distributed, subthreshold neural activity patterns in sensory cortex.
- Current fMRI analysis methods may overlook subtle neural representations of working memory.
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