Cortical hemodynamic response associated with spatial coding: A near-infrared spectroscopy study

Abiot Y. DERBIE, Bolton CHAU, Bess LAM, Yun-hua FANG, Kin-Hung TING, Ho Yin Clive WONG, Jing TAO, Li-dian CHEN, Che Hin Chetwyn CHAN

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6 Citations (Scopus)


Allocentric and egocentric are two types of spatial coding. Previous studies reported the dorsal attention network's involvement in both types. To eliminate possible paradigm-specific confounds in the results, this study employed fine-grained cue-to-target paradigm to dissociate allocentric (aSC) and egocentric (eSC) spatial coding. Twenty-two participants completed a custom visuospatial task, and changes in the concentration of oxygenated hemoglobin (O₂-Hb) were recorded using functional near-infrared spectroscopy (fNIRS). The least absolute shrinkage and selection operator-regularized principal component (LASSO-RPC) algorithm was used to identify cortical sites that predicted the aSC and eSC conditions' reaction times. Significant changes in O₂-Hb concentration in the right inferior parietal lobule (IPL) and post-central gyrus regions were common in both aSC and eSC. Results of inter-channel correlations further substantiate cortical activities in both conditions were predominantly over the right parieto-frontal areas. Together with right superior frontal gyrus areas be the reaction time neural correlates, the results suggest top-down attention and response-mapping processes are common to both spatial coding types. Changes unique to aSC were in clusters over the right intraparietal sulcus, right temporo-parietal junction, and left IPL. With the left pre-central gyrus region, be the reaction time neural correlate, aSC is likely to involve more orienting attention, updating of spatial information, and object-based response selection and inhibition than eSC. Future studies will use other visuospatial task designs for testing the robustness of the findings on spatial coding processes. Copyright © 2021 Springer Science+Business Media, LLC, part of Springer Nature.
Original languageEnglish
Pages (from-to)207-220
JournalBrain Topography
Early online dateJan 2021
Publication statusPublished - Mar 2021


Derbie, A. Y., Chau, B., Lam, B., Fang, Y.-H., Ting, K.-H., Wong, C. Y. H., . . . Chan, C. C. H. (2021). Cortical hemodynamic response associated with spatial coding: A near-infrared spectroscopy study. Brain Topography, 34, 207-220. doi: 10.1007/s10548-021-00821-9


  • Fnirs
  • IPL
  • SFG
  • Attention
  • Allocentric spatial coding
  • Egocentric spatial coding
  • Frames of reference
  • Top-down attention


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