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Developmental lesions of visual cortex influence control of reaching
1Department of Exercise Science, The University of Iowa, Iowa City, IA 52242, USA. Warren-darling@uiowa.edu
Neuropsychologia
|February 13, 2001
Summary
Individuals with early-life visual cortex damage can still perform visually guided reaching. However, their movements show greater variability and errors, suggesting early vision is crucial for developing motor control mechanisms.
Area of Science:
- Neuroscience
- Developmental neuroscience
- Motor control
Background:
- The visual cortex plays a critical role in processing visual information for guiding movements.
- Understanding how early-life visual cortex damage impacts motor development is essential for comprehending neural plasticity.
Observation:
- A young adult (EW) with extensive bilateral visual cortex lesions since birth demonstrated visually guided reaching capabilities.
- EW's reaching movements exhibited significantly greater endpoint variability and hand path curvature compared to controls, particularly with the left hand.
Findings:
- Despite severe visual impairment, EW matched control group speed in visually guided reaching.
- Sensorimotor transformation errors were substantial in EW's movements.
- Reduced visual acuity in controls did not replicate EW's specific movement impairments, decoupling them from vision deficits alone.
Implications:
- Early-life visual cortex development is vital for establishing lifelong neural pathways for precise motor planning and execution.
- This case highlights the brain's remarkable adaptability while underscoring the critical role of early sensory input in shaping motor control systems.