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Neural correlates for task-relevant facilitation of visual inputs during visually-guided hand movements
Nicolas Lebar1, Pierre-Michel Bernier2, Alain Guillaume1
1Laboratory of Cognitive Neuroscience, FR 3C 3512, CNRS and Aix-Marseille University, Marseille, France.
Neuroimage
|July 21, 2015
Summary
Cortical visual sensitivity increases during hand tracing tasks, especially with mirror-reversed vision. High performers show greater visual cortex activation, indicating enhanced visual processing for accurate visually-guided movements.
Area of Science:
- Neuroscience
- Cognitive Science
- Visual Perception
Background:
- Vision is crucial for controlling fine motor actions, particularly hand movements requiring precision.
- The neural mechanisms underlying vision's enhancement of movement accuracy are not fully understood.
Purpose of the Study:
- To investigate if cortical sensitivity to visual input increases during spatially-constrained hand movements compared to resting.
- To examine how visual feedback manipulation (mirror-reversed vision) affects visual sensitivity during tracing.
- To explore the relationship between visual sensitivity and tracing performance accuracy.
Main Methods:
- Compared cortical visual-evoked potentials (VEPs) during a hand tracing task versus a resting task.
- Utilized normal and mirror-reversed vision conditions to manipulate task difficulty.
- Categorized participants into high (HP) and low (LP) performer groups based on tracing accuracy with mirror-reversed vision.
Main Results:
- Both HP and LP groups showed increased visual sensitivity in occipital and MT/MST regions during tracing compared to resting.
- Mirror-reversed vision increased response latencies but not amplitude in visual areas.
- HP group exhibited greater movement-related visual sensitivity increases in posterior inferior parietal, temporal-occipital, and inferior-temporal regions compared to the LP group.
Conclusions:
- Enhanced cortical sensitivity to visual input supports accurate visually-guided hand movements.
- Accurate tracing with conflicting visual and somatosensory feedback necessitates additional visual information processing.
