Multiple reference frames used by the human brain for spatial perception and memory.

Area of Science:

• Cognitive Neuroscience
• Neuroimaging
• Spatial Cognition

Background:

• Understanding how the brain represents spatial information is crucial for cognitive neuroscience.
• Previous research distinguishes between egocentric and allocentric reference frames, but specific neural substrates remain debated.

Purpose of the Study:

• To review human functional neuroimaging studies on cortical regions involved in spatial reference frames.
• To investigate the neural basis of egocentric (body-referencing) and allocentric (environmental referencing) spatial representations.
• To present novel fMRI data on the role of specific brain regions in stable spatial object perception.

Main Methods:

• Systematic review of human functional neuroimaging studies.
• Functional magnetic resonance imaging (fMRI) study with a perceptual spatial task.
• Analysis of brain region activation during different spatial referencing tasks.

Main Results:

• Posterior parietal and frontal regions are selectively involved in egocentric localization (body referencing).
• Parahippocampal, retrosplenial, and precuneus regions are selectively involved in allocentric representation (environmental referencing).
• fMRI study identified selective activation for stable object locations, dissociable from explicit landmark memory recall.

Conclusions:

• Distinct cortical networks support egocentric and allocentric spatial referencing.
• Environmental referencing relies on a network including parahippocampal and retrosplenial cortices.
• The retrosplenial cortex is further engaged by explicit memory recall of landmark locations.