Places in the Brain: Bridging Layout and Object Geometry in Scene-Selective Cortex

Area of Science:

• Cognitive Neuroscience
• Visual Perception
• Neuroimaging

Background:

• Scene navigation in animals relies on sense and egocentric distance.
• Human neuroimaging identifies the occipital place area (OPA) and retrosplenial complex (RSC) for navigation-related scene information, but not the parahippocampal place area (PPA).
• The specific role of the PPA in scene processing remains unclear.

Purpose of the Study:

• To investigate the geometric properties represented by the PPA during scene processing.
• To determine if the PPA utilizes object-recognition-associated geometric properties (relative length, angle) in the context of scene layouts.
• To differentiate the geometric representations in PPA, OPA, and RSC.

Main Methods:

• Functional magnetic resonance imaging (fMRI) adaptation technique was employed.
• Participants viewed images of scenes and objects.
• Sensitivity of PPA, OPA, and RSC to changes in relative length and angle was measured.

Main Results:

• The PPA showed sensitivity to relative length and angle changes in scene images, but not in object images.
• The OPA also demonstrated sensitivity to these geometric changes in scenes.
• The RSC was tolerant to changes in relative length and angle in scene images.

Conclusions:

• Geometric properties traditionally linked to object recognition are also utilized in scene processing by the PPA.
• Scene-selective cortical regions differentially represent geometric information.
• Findings suggest a distinction between geometric properties guiding navigation versus scene categorization.