Frontal eye fields involved in shifting frame of reference within working memory for scenes

Area of Science:

• Cognitive Neuroscience
• Neuroimaging
• Spatial Cognition

Background:

• Working memory (WM) is crucial for processing spatial relationships.
• Distinguishing between egocentric (self-referenced) and allocentric (other-referenced) spatial frames is fundamental to spatial cognition.

Purpose of the Study:

• To investigate the neural correlates of recalling allocentric versus egocentric spatial information within working memory.
• To examine the relationship between brain activity, specifically in the frontal eye fields (FEF), and performance on spatial tasks.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to measure brain activity (BOLD signal).
• Participants performed a spatial-relations task involving recall of previously seen images, using either egocentric or allocentric reference frames.
• Behavioral performance (response time, accuracy) was correlated with fMRI data, with principal component analysis used to derive a generalized performance measure.

Main Results:

• The frontal eye fields (FEF), bilaterally, exhibited significantly higher BOLD responses during allocentric spatial recall compared to egocentric recall.
• This difference in FEF activation was more pronounced in high-performing individuals than in low-performing individuals.
• Analysis of actual eye movements did not reveal differences between egocentric and allocentric recall conditions.

Conclusions:

• The frontal eye fields (FEF) appear to play a role in shifting reference frames within working memory, potentially by modulating internal gaze.
• FEF activation patterns during spatial recall reflect the cognitive demands of maintaining and manipulating spatial information in different reference frames.
• The findings suggest that the neural mechanisms supporting overt eye movements may also be involved in the internal reorientation of spatial representations in working memory.