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Related Experiment Video

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Cortical Hemodynamic Response Associated with Spatial Coding: A Near-Infrared Spectroscopy Study.

Abiot Y Derbie1,2, Bolton Chau1, Bess Lam1

  • 1Applied Cognitive Neuroscience Laboratory, Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China.

Brain Topography
|January 23, 2021
PubMed
Summary
This summary is machine-generated.

This study used functional near-infrared spectroscopy to differentiate allocentric (aSC) and egocentric (eSC) spatial coding. Both spatial coding types involve similar top-down attention and response-mapping processes in the right parieto-frontal areas.

Keywords:
Allocentric spatial codingAttentionEgocentric spatial codingFnirsFrames of referenceIPLSFGTop-down attention

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Spatial Cognition

Background:

  • Allocentric and egocentric spatial coding are fundamental cognitive processes.
  • Previous research implicated the dorsal attention network in both coding types, but paradigm confounds remain.
  • Dissociating these coding types is crucial for understanding spatial representation.

Purpose of the Study:

  • To precisely differentiate the neural correlates of allocentric (aSC) and egocentric (eSC) spatial coding.
  • To investigate the common and unique brain regions involved in each coding type.
  • To identify neural mechanisms underlying spatial coding using a refined experimental design.

Main Methods:

  • Employed a fine-grained cue-to-target paradigm to dissociate aSC and eSC.
  • Utilized functional near-infrared spectroscopy (fNIRS) to measure oxygenated hemoglobin (O2-Hb) changes in 22 participants.
  • Applied the least absolute shrinkage and selection operator-regularized principal component (LASSO-RPC) algorithm to identify predictive cortical sites.

Main Results:

  • Both aSC and eSC showed significant O2-Hb changes in the right inferior parietal lobule (IPL) and post-central gyrus.
  • Cortical activity for both conditions was predominantly observed in right parieto-frontal areas, with the right superior frontal gyrus linked to reaction times.
  • Unique changes for aSC were found in the right intraparietal sulcus, right temporo-parietal junction, and left IPL.

Conclusions:

  • Top-down attention and response-mapping processes are common neural correlates for both allocentric and egocentric spatial coding.
  • Allocentric spatial coding uniquely involves enhanced orienting attention, spatial information updating, and object-based response selection/inhibition, particularly in the left pre-central gyrus.
  • Findings highlight distinct neural pathways for different spatial coding strategies, warranting further investigation with varied visuospatial tasks.