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Cortical activations associated with auditorily paced finger tapping
Bettina Pollok1, Katharina Müller, Gisa Aschersleben
1Max Planck Institute for Psychological Research, Munich, Germany. bettina.pollok@uni-duesseldorf.de
Neuroreport
|February 25, 2003
Summary
This study shows that brain activity in the primary somatosensory cortex during finger tapping is primarily related to the physical act of tapping, not cognitive timing processes. This clarifies the role of somatosensory feedback in movement synchronization.
Area of Science:
- Neuroscience
- Motor Control
- Somatosensory System
Background:
- Auditory pacing tasks involve synchronizing movements with external signals.
- The primary sensorimotor cortex shows activity during synchronized finger tapping.
- A third neuromagnetic source in the primary somatosensory cortex has an unclear function.
Purpose of the Study:
- To determine if the third sensorimotor source reflects somatosensory feedback or cognitive timing processes.
- To clarify the role of the primary somatosensory cortex in movement timing relative to external events.
Main Methods:
- Used a 122-channel whole-head neuromagnetometer to record brain activity.
- Healthy subjects performed auditorily paced unilateral finger taps.
- Analyzed neuromagnetic responses to differentiate between tap-related and click-related activity.
Main Results:
- Three tap-related neuromagnetic sources were identified in the contralateral sensorimotor cortex.
- These sources showed stronger activation related to the finger tap than the auditory click.
- Results contradict the hypothesis of a cognitive timing function for the third source.
Conclusions:
- Activation in the primary somatosensory cortex during this task likely represents exclusively somatosensory feedback.
- The findings suggest no additional cognitive processes are localized in this specific sensorimotor area for this task.