Elsevier

Neuropsychologia

Volume 34, Issue 5, May 1996, Pages 471-474
Neuropsychologia

Note
Detecting directional hypokinesia: The epidiascope technique

https://doi.org/10.1016/0028-3932(95)00123-9Get rights and content

Abstract

A new technique to detect directional hypokinesia is proposed. Subjects with unilateral neglect were administered cancellation tests with an epidiascope used to dissociate visual input from motor output. Two different cancellation tasks were performed in order to compare this technique with the method devised by Tegnér and Levander [Brain 114, 1943–1951, 1991]. No difference in detecting hypokinetic deficits was observed; however, our method was easier to perform and more suitable for clinical testing.

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    2018, Handbook of Clinical Neurology
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    Line bisection tasks, as target cancellation tasks, performed using the ipsilateral hand, do not readily allow the researcher to tease apart the perceptual input versus the response output components of the ipsilateral error (Vallar and Mancini, 2010). As for target cancellation (Tegnér and Levander, 1991; Nico, 1996), tasks in which the to-be-bisected line is seen by the participant in the ipsilateral half-field (Coslett et al., 1990), or, with the same logic, the direction of the hand movement occur opposite to the movement of the midpoint that is to be set (Bisiach et al., 1990) have been proposed. A variant of the line bisection task, that does not require a motor response, the landmark test (Milner et al., 1993) has also been used with this in mind.

  • Reperfusion of specific cortical areas is associated with improvement in distinct forms of hemispatial neglect

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    Neglect can also differ based on the nature of the underlying bias, with a “perceptual-attentional” bias resulting in a failure to detect stimuli on the contralesional side, versus a “motor-intentional” bias that results in a reduction of movements toward the contralesional side (Coslett et al., 1990). Using a novel video apparatus described by Nico (1996), some investigators have isolated the effects of these biases by having subjects perform line bisection and target cancellation in a setup that decoupled visual feedback from the physical workspace (Na et al., 1998). Some patients showed mostly perceptual-attentional bias, some showed mostly motor-intentional bias, and others showed a combination of the two.

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