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Short-term plasticity of visuo-haptic object recognition.

Tanja Kassuba1, Corinna Klinge2, Cordula Hölig3

  • 1Danish Research Centre for Magnetic Resonance, Copenhagen University Hospital Hvidovre Hvidovre, Denmark ; NeuroImageNord/Department of Systems Neuroscience, University Medical Center Hamburg-Eppendorf Hamburg, Germany ; Department of Neurology, Christian-Albrechts-University Kiel, Germany.

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Summary

Repetitive transcranial magnetic stimulation (rTMS) applied to the left lateral occipital cortex (LO) altered brain activity during object recognition tasks. This perturbation revealed modality-specific network interactions for visual and haptic processing.

Keywords:
functional magnetic resonance imaginghaptic perceptionmultisensory interactionsobject recognitionrepetitive transcranial magnetic stimulationvisual perception

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Functional magnetic resonance imaging (fMRI) studies implicate the lateral occipital cortex (LO), fusiform gyrus (FG), and intraparietal sulcus (IPS) in visuo-haptic object integration.
  • Understanding the neural mechanisms of crossmodal object recognition remains a key area of research.

Purpose of the Study:

  • To investigate the causal role of the left lateral occipital cortex (LO) in visuo-haptic object integration using offline repetitive transcranial magnetic stimulation (rTMS).
  • To examine how perturbing left LO affects brain activity and network interactions during a visuo-haptic delayed-match-to-sample task.

Main Methods:

  • Applied 30 minutes of sham or real 1 Hz offline rTMS to the left LO before participants performed a visuo-haptic delayed-match-to-sample task during fMRI.
  • Participants matched objects presented sequentially across visual and haptic modalities in both directions (visual-haptic and haptic-visual).

Main Results:

  • Real rTMS transiently decreased activity in the stimulated left LO and affected regions like the right LO and bilateral FG during haptic stimulus 1 (S1) processing.
  • rTMS increased activation in regions including the right LO, left FG, and bilateral IPS during stimulus 2 (S2) processing, with modality-specific recruitment.
  • Increased activations were observed for incongruent vs. congruent matching in specific regions (e.g., right anterior parahippocampus, left FG, bilateral IPS) after real rTMS.

Conclusions:

  • Focal perturbation of the left LO triggers modality-specific interactions with other object processing regions, suggesting a role in maintaining object recognition.
  • Visual and haptic processing engage partially distinct brain networks during visuo-haptic object matching, as evidenced by modality-specific activation patterns post-rTMS.