Components of verbal working memory: evidence from neuroimaging

Area of Science:

• Cognitive Neuroscience
• Neuroimaging

Background:

• Verbal working memory is crucial for cognitive functions.
• Previous research suggests multiple neural components underlie verbal working memory.

Purpose of the Study:

• To review human neuroimaging studies on the neural bases of verbal working memory.
• To explore the components and neural implementation of verbal working memory.

Main Methods:

• Review of human neuroimaging studies.
• Analysis of subtraction logic in fMRI studies.
• Examination of parametric variation methods.
• Distinction between storage and processing tasks.

Main Results:

• Verbal working memory comprises multiple components, including subvocal rehearsal supported by left-hemisphere speech areas (Broca's area, premotor, supplementary motor areas).
• Executive processing of memory contents may involve the dorsolateral prefrontal cortex, particularly when active processing is required.

Conclusions:

• Verbal working memory is a complex function with distinct neural substrates for different operations.
• Neuroimaging techniques like subtraction logic and parametric variation are valuable for understanding these neural bases.