Perceptual-motor dysfunction.

Area of Science:

• Neuroscience
• Cognitive Science

Background:

• Perceptual-motor integration, encompassing motor planning, sequencing, and representation, is vital for voluntary behaviors.
• Feedforward and feedback loops are key mechanisms for integrating these cognitive domains.

Observation:

• Functional imaging and lesional studies implicate the posterior parietal region in linking perception and motor action.
• Neurologic injuries can lead to perceptual-motor dysfunctions like apraxias, agnosia, hemineglect, and Balint syndrome.

Findings:

• Unimodal and heteromodal association cortices, along with the basal ganglia, are critical for perceptual-motor functions across various conditions.
• The nondominant hemisphere directs spatial attention and intention, while the dominant hemisphere governs complex motor actions.

Implications:

• Perceptual-motor dysfunction is increasingly recognized in neurodegenerative diseases, including Parkinson disease and posterior cortical atrophy.
• There is a significant need for advanced rehabilitation strategies to address these dysfunctions, especially in neurodegenerative contexts.