Visually guided unimanual and bimanual reaching rely on different cognitive mechanisms: Evidence from optic ataxia
نویسندگان
چکیده
منابع مشابه
Cortical control of visually guided reaching: evidence from patients with optic ataxia.
The dorsal stream of visual information processing connecting V1 to the parietal cortex is thought to provide a fast control of visually guided reaching. Important for this assumption was the observation that in both the monkey and the human, parietal lesions may provoke disturbance of visually goal-directed hand movements. In the human, severe misreaching termed 'optic ataxia' has been ascribe...
متن کاملOptic ataxia revisited: visually guided action versus immediate visuomotor control.
Optic ataxia and visual agnosia have been proposed to constitute a double dissociation which provides the main argument for the assimilation of the anatomical distinction between a dorsal and a ventral visual stream to the functional distinction between perception and action. In the present review, we argue that insufficient evidence has been collected to argue for this double dissociation. Sev...
متن کاملDecoupled Visually-Guided Reaching in Optic Ataxia: Differences in Motor Control between Canonical and Non-Canonical Orientations in Space
Guiding a limb often involves situations in which the spatial location of the target for gaze and limb movement are not congruent (i.e. have been decoupled). Such decoupled situations involve both the implementation of a cognitive rule (i.e. strategic control) and the online monitoring of the limb position relative to gaze and target (i.e. sensorimotor recalibration). To further understand the ...
متن کاملTwo Agents in the Brain: Motor Control of Unimanual and Bimanual Reaching Movements
Previous studies have suggested that the left and right hands have different specialties for motor control that can be represented as two agents in the brain. This study examined how coordinated movements are performed during bimanual reaching tasks to highlight differences in the characteristics of the hands. We examined motor movement accuracy, reaction time, and movement time in right-handed...
متن کاملVisually guided reaching depends on motion area MT+.
Visual information is crucial for goal-directed reaching. A number of studies have recently shown that motion in particular is an important source of information for the visuomotor system. For example, when reaching a stationary object, movement of the background can influence the trajectory of the hand, even when the background motion is irrelevant to the object and task. This manual following...
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ژورنال
عنوان ژورنال: Journal of Vision
سال: 2018
ISSN: 1534-7362
DOI: 10.1167/18.10.69