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Sustained spatial attention to vibration is mediated in primary somatosensory cortex
C-M Giabbiconi1, N J Trujillo-Barreto, T Gruber
1Institut für Psychologie I, Universität Leipzig, Seeburgstrasse 14-20, D-04103 Leipzig, Germany.
Neuroimage
|December 26, 2006
Summary
Spatial attention enhances tactile processing by modulating neural responses in the somatosensory cortex. This study reveals a low-level sensory gain control mechanism for sustained attention to touch.
Area of Science:
- Neuroscience
- Somatosensory System
- Human Perception
Background:
- Attentional focus improves sensory event processing at specific body locations.
- The precise stage of somatosensory pathway modulation by tactile attention is debated.
- Previous research focused on transient stimuli, leaving sustained stimulation effects largely unexplored.
Purpose of the Study:
- To investigate the neural basis of sustained spatial attention in the somatosensory system.
- To explore the cortical sources and topographical distribution of attentional modulation during continuous tactile stimulation.
Main Methods:
- Utilized vibrating stimuli at different frequencies presented simultaneously to various body locations.
- Recorded somatosensory steady-state evoked potentials (SSSEPs) using 128 electrodes.
- Applied a VARETA (Variable Electric Response Amplitude) approach to analyze cortical sources.
Main Results:
- Attention significantly increased the amplitude of the somatosensory steady-state evoked potential (SSSEP).
- Attentional modulation of SSSEP amplitude was observed in the primary somatosensory cortex.
- No significant differences in SSSEP amplitude topographies were found between attended and unattended locations.
Conclusions:
- Sustained spatial attention to tactile stimuli is mediated by the primary somatosensory cortex.
- Findings suggest a low-level sensory gain control mechanism underlies tactile spatial attention.
- This mechanism operates early in the somatosensory pathway for continuous stimulation.
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