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Parietal disruption impairs reflexive spatial attention within and between sensory modalities
Christopher D Chambers1, Jonathan M Payne, Jason B Mattingley
1Institute of Cognitive Neuroscience, University College London, United Kingdom. chris.chambers@ucl.ac.uk
Neuropsychologia
|February 7, 2007
Summary
The right inferior parietal cortex is crucial for shifting attention between senses, particularly when a touch cue guides visual or touch targets. This brain region coordinates attention across sensory modalities.
Area of Science:
- Cognitive Neuroscience
- Neuroscience of Attention
- Human Brain Function
Background:
- Reflexive spatial attention is vital for perception and action control.
- Existing research suggests attention operates within and across sensory modalities.
- Mechanisms linking attention across sensory modalities remain poorly understood.
Purpose of the Study:
- To investigate the role of the parietal cortex in coordinating attention shifts between vision and touch.
- To explore how the parietal cortex mediates reflexive spatial orienting across sensory modalities.
Main Methods:
- Utilized transcranial magnetic stimulation (TMS) to probe parietal cortex function.
- Participants performed visual and somatosensory target localization tasks.
- Non-informative visual or somatosensory cues preceded targets; TMS was applied during cue presentation.
Main Results:
- The right angular and supramarginal gyri were critical for reflexive orienting to visual and somatosensory targets following somatosensory cues.
- TMS applied to these regions did not affect orienting based on visual cues.
- Findings suggest a modality-dependent role for the inferior parietal cortex in cross-modal attention.
Conclusions:
- The inferior parietal cortex plays a critical role in mediating reflexive attention shifts within and between sensory modalities.
- Modality-specific effects suggest distinct neural pathways for visual versus somatosensory orienting.
- The findings contribute to understanding the neural basis of cross-modal spatial attention.
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