Distinct networks coupled with parietal cortex for spatial representations inside and outside the visual field.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Spatial Cognition

Background:

• Egocentric spatial representation is crucial for navigation and interaction.
• Existing research primarily explored egocentric space within the visual field.
• Neural mechanisms for representing space relative to the body's posterior remain less understood.

Purpose of the Study:

• To investigate the neural underpinnings of egocentric spatial memory for locations around the body.
• To differentiate brain network involvement in representing targets to the sides versus behind the self.

Main Methods:

• Employed a spatial-memory task within a virtual environment.
• Utilized functional Magnetic Resonance Imaging (fMRI) and Magnetoencephalography (MEG) for neural data acquisition.
• Participants recalled target locations situated to their left, right, or back.

Main Results:

• The frontoparietal network showed greater activation for left/right target retrieval compared to posterior targets.
• The medial temporal lobe (MTL)-parietal network was more engaged during the retrieval of targets located behind the participant.
• MEG data indicated earlier activation of the MTL-parietal network than the frontoparietal network.

Conclusions:

• The parietal cortex integrates information from distinct neural networks to represent egocentric space.
• Differential network activation suggests specialized roles in processing spatial information relative to the body.
• Findings highlight the dynamic interplay between frontoparietal and MTL-parietal networks in spatial cognition.