Human spatial navigation: Neural representations of spatial scales and reference frames obtained from an ALE...

Area of Science:

• Neuroscience
• Cognitive Psychology

Background:

• Humans utilize allocentric (external) and egocentric (self-centered) reference frames for spatial navigation.
• Different spatial scales, such as environmental (large-scale) and vista (small-scale) spaces, are navigated using these frames.
• The neural underpinnings of how the brain processes different spatial scales and reference frames remain incompletely understood.

Purpose of the Study:

• To investigate the common and distinct brain regions involved in spatial navigation across different spatial scales and reference frames.
• To clarify how the brain differentiates between environmental and vista spaces.
• To determine the neural correlates distinguishing allocentric and egocentric spatial reference frames.

Main Methods:

• Activation Likelihood Estimation (ALE) meta-analysis.
• Inclusion of 47 functional magnetic resonance imaging (fMRI) studies on human spatial navigation.
• Statistical analysis of brain activation patterns associated with different navigation conditions.

Main Results:

• Both environmental and vista spaces activated common regions: parahippocampal place area (PPA), retrosplenial complex (RSC), and occipital place area.
• Environmental space showed greater activation in occipital and frontal regions compared to vista space.
• Allocentric and egocentric frames activated bilateral PPA and right RSC, with allocentric navigation showing stronger activation in specific areas like the right culmen and left middle frontal gyrus.

Conclusions:

• Spatial navigation at different scales engages both shared and unique neural substrates.
• The brain utilizes distinct, yet overlapping, regions for processing allocentric and egocentric reference frames.
• Neural representations for spatial reference frames are not rigidly separated, allowing for flexible navigation strategies.