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Predictability of the target stimulus for sensory-guided movement modulates early somatosensory cortical potentials
- Source :
- Clinical Neurophysiology. 117:1345-1353
- Publication Year :
- 2006
- Publisher :
- Elsevier BV, 2006.
-
Abstract
- Objective To investigate the role of sensory modulation in the control of sensory-guided behaviour. Specifically, we hypothesized that early somatosensory evoked potentials (SEPs) would be facilitated during performance of continuous sensory-guided movement requiring sustained attention. Methods Median nerve SEPs were elicited via electrical stimulation and recorded from scalp electrodes while subjects performed tasks requiring continuous sensory–motor transformations. Subjects received a predictable (rhythmic amplitude modulation) or unpredictable (random amplitude modulation) amplitude varying tactile stimulus (frequency constant at 20 Hz) delivered to the tip of the index finger either alone or with the requirement to track it by modulating the isometric grip force produced by the opposite hand. Results Early SEP (N20-P27) amplitudes were differentially modulated during unpredictable tracking compared to sensory–motor controls. Specifically, N20 amplitudes were attenuated and P27 amplitudes were enhanced during sensory-guided tracking. Conclusions Sustained attention to task-relevant sensory stimuli differentially modulates areas within primary somatosensory cortex (S1) during a continuous sensory–motor transformation. Significance These data have implications for understanding the role of attention in regulating somatosensory cortices during sensory–motor behaviour.
- Subjects :
- Adult
Male
Movement
Sensory system
Stimulus (physiology)
Somatosensory system
Evoked Potentials, Somatosensory
Physiology (medical)
Reaction Time
medicine
Humans
Attention
Neurons, Afferent
Aged
Motor Neurons
Sensory gating
Motor control
Index finger
Middle Aged
Electric Stimulation
Sensory Systems
Median Nerve
Electrophysiology
medicine.anatomical_structure
Neurology
Touch
Somatosensory evoked potential
Female
Neurology (clinical)
Psychology
Neuroscience
Psychomotor Performance
Subjects
Details
- ISSN :
- 13882457
- Volume :
- 117
- Database :
- OpenAIRE
- Journal :
- Clinical Neurophysiology
- Accession number :
- edsair.doi.dedup.....e2a3eb3913076c4ff3463721aa062604
- Full Text :
- https://doi.org/10.1016/j.clinph.2006.02.024