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Published on: April 16, 2014
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A Neural Basis for Developmental Topographic Disorientation.
Jiye G Kim1, Elissa M Aminoff2, Sabine Kastner3
1Princeton Neuroscience Institute and jiyekim@princeton.edu.
Summary
Developmental topographic disorientation (DTD) impairs navigation despite normal brain structure. A study found atypical function and connectivity in the retrosplenial cortex (RSC), suggesting its disruption underlies DTD.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Neuroimaging
Background:
- Developmental topographic disorientation (DTD) causes lifelong navigation impairments without apparent brain damage.
- The neural mechanisms underlying DTD remain largely unknown.
Purpose of the Study:
- To investigate the neural basis of DTD using comprehensive neuroimaging in an affected individual.
- To examine the functional properties and connectivity of scene-perception and navigation-related brain regions in DTD.
Main Methods:
- Functional magnetic resonance imaging (fMRI) and diffusion tensor imaging (DTI) were employed.
- Detailed analysis of scene-selective regions, including the parahippocampal place area (PPA) and retrosplenial cortex (RSC).
- Assessment of functional connectivity between key navigation-related brain areas.
Main Results:
- The individual with DTD showed intact scene-selective responses in PPA, transverse occipital sulcus, and RSC.
- Atypical functional response profile and coupling between RSC and PPA were observed in the DTD individual.
- Structural connectivity remained intact, indicating functional, not structural, alterations in RSC.
Conclusions:
- The retrosplenial cortex (RSC) plays a critical role in navigation-related processing.
- Altered functional properties and connectivity of the RSC may represent the neural basis for developmental topographic disorientation (DTD).
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