Optic ataxia in patients with thalamic lesions.

ABSTRACT: Lesions in the parietal cortex can strongly impair visually guided reach-grasping behaviour. A specific reaching deficit termed 'optic ataxia' (OA) occurs when eye and hand position are dissociated. OA has typically been studied in patients with lesions in the parietal cortex, neglecting potential thalamic contributions. Here, we examined 28 acute stroke patients (age 58.9 ± 12.6 years) with circumscribed thalamic lesions for the presence of OA. We leveraged MRI-based lesion-symptom mapping to address the contributions of specific thalamic nuclei to visually guided reaching deficits under foveal and peripheral viewing conditions. Based on the cortical literature, we hypothesized that lesions in thalamic nuclei with strong connections to the inferior and superior parietal cortex, such as th

SUBMITTER: Wilke M 

PROVIDER: S-EPMC12484446 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature