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NeuroImage v.162, 2017년, pp.257 - 268   SCI SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

The role of auditory cortex in the spatial ventriloquism aftereffect

Zierul, Björn (Biological Psychology and Neuropsychology, University of Hamburg, 20146 Hamburg, Germany ) ; Röder, Brigitte (Biological Psychology and Neuropsychology, University of Hamburg, 20146 Hamburg, Germany ) ; Tempelmann, Claus (Department of Neurology, Otto-von-Guericke University, 39120 Magdeburg, Germany ) ; Bruns, Patrick (Biological Psychology and Neuropsychology, University of Hamburg, 20146 Hamburg, Germany ) ; Noesselt, Toemme (Institute of Biological Psychology, Otto-von-Guericke University, 39106 Magdeburg, Germany ) ;
  • 초록  

    Abstract Cross-modal recalibration allows the brain to maintain coherent sensory representations of the world. Using functional magnetic resonance imaging (fMRI), the present study aimed at identifying the neural mechanisms underlying recalibration in an audiovisual ventriloquism aftereffect paradigm. Participants performed a unimodal sound localization task, before and after they were exposed to adaptation blocks, in which sounds were paired with spatially disparate visual stimuli offset by 14° to the right. Behavioral results showed a significant rightward shift in sound localization following adaptation, indicating a ventriloquism aftereffect. Regarding fMRI results, left and right planum temporale (lPT/rPT) were found to respond more to contralateral sounds than to central sounds at pretest. Contrasting posttest with pretest blocks revealed significantly enhanced fMRI-signals in space-sensitive lPT after adaptation, matching the behavioral rightward shift in sound localization. Moreover, a region-of-interest analysis in lPT/rPT revealed that the lPT activity correlated positively with the localization shift for right-side sounds, whereas rPT activity correlated negatively with the localization shift for left-side and central sounds. Finally, using functional connectivity analysis, we observed enhanced coupling of the lPT with left and right inferior parietal areas as well as left motor regions following adaptation and a decoupling of lPT/rPT with contralateral auditory cortex, which scaled with participants’ degree of adaptation. Together, the fMRI results suggest that cross-modal spatial recalibration is accomplished by an adjustment of unisensory representations in low-level auditory cortex. Such persistent adjustments of low-level sensory representations seem to be mediated by the interplay with higher-level spatial representations in parietal cortex. Highlights Cross-modal recalibration in the ventriloquism aftereffect was studied using fMRI. Low-level auditory cortical areas were affected by spatial recalibration through vision. Balance of left and right auditory areas reflects spatial sound perception. Audio-visual recalibration uses a network of temporal/parietal areas coding space.


  • 주제어

    Cross-modal learning .   Cross-modal recalibration .   Audiovisual ventriloquism aftereffect .   Spatial hearing .   Psychophysiological interaction .   Functional magnetic resonance imaging.  

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