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Cortex

Volume 121, December 2019, Page 481
Cortex

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Definition: Optic ataxia

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  • Unilateral resection of both cortical visual pathways in a pediatric patient alters action but not perception

    2022, Neuropsychologia
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    Patients with lesions to the ventral pathway have been shown to have a deficit in visual object perception, termed visual agnosia, but nevertheless have relatively intact visually guided behaviors (Ganel and Goodale, 2019; Goodale et al., 1991; Karnath et al., 2009; Whitwell et al., 2014; but see Himmelbach et al., 2012; Rossit et al., 2018; Schenk, 2006, 2012). In contrast, individuals with posterior parietal lobe lesions (dorsal pathway) specifically with lesions in the superior parietal lobule (SPL) and areas around the intraparietal sulcus (IPS), suffer from ‘optic ataxia’, an impairment in reaching and grasping objects in their contralesional visual field but, nonetheless, have minimal perceptual deficits (Jakobson et al., 1991; Karnath and Perenin, 2005; Rossetti et al., 2019; but see Medina et al. (2020) who documented mild perceptual deficits in these patients). Interestingly, the remarkable deficits in object perception observed after a lesion sustained to the ventral pathway are not always evident.

  • Peripheral reaching in Alzheimer's disease and mild cognitive impairment

    2022, Cortex
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    It is therefore possible that degeneration in the PPC, along the dorsal visual stream, in early stages of the disease does result in disrupted visuomotor processing. The prototypical visuomotor disorder associated with damage to the PPC is optic ataxia (Balint, 1909; Karnath & Perenin, 2005; Rossetti et al., 2019). Patients with optic ataxia typically have little trouble reaching accurately to targets in central vision, but show large spatial errors when reaching for targets in their peripheral visual field (Perenin & Vighetto, 1988; Ratcliff & Davies-Jones, 1972).

  • Visuomotor control in the healthy and damaged brain

    2021, Encyclopedia of Behavioral Neuroscience: Second Edition
  • Attention attracts action in healthy participants: An insight into optic ataxia?

    2021, Cortex
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    Optic ataxia is a visuomotor disorder defined by inaccurate reaching to visual targets that is not attributable to primary visual, primary proprioceptive, motor, cerebellar or cognitive impairments (Rossetti, Pisella, & McIntosh, 2019).

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