Tracking the Emergence of Location-based Spatial Representations in Human Scene-Selective Cortex.

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Spatial Navigation

Background:

• The human brain constructs allocentric representations of environmental locations, crucial for orientation irrespective of travel direction.
• Understanding the formation of these viewpoint-independent location representations remains a significant challenge in neuroscience.

Purpose of the Study:

• To investigate the emergence of location-based representations in scene-selective brain regions.
• To differentiate the roles of the parahippocampal cortex (PHC) and retrosplenial cortex (RSC) in forming and utilizing these representations.

Main Methods:

• Utilized functional magnetic resonance imaging (fMRI) with representational similarity analysis.
• Employed linear mixed models to track the development of neural representations.
• Designed an experimental paradigm with 'overlap' and 'no-overlap' video conditions to manipulate learning about scene locations.

Main Results:

• Representations of scenes from the same location showed increased similarity in the PHC and RSC after exposure to the 'overlap' condition.
• Emergence of location representations in the PHC was independent of task performance.
• RSC representations emerged only when participants could behaviorally identify scenes as being from the same location.

Conclusions:

• Location-based representations can be tracked in the PHC and RSC within a single fMRI experiment.
• Findings support computational models where the RSC transforms general location information into viewpoint-specific, behaviorally relevant representations.