Crossover is not a consequence of neglect: A test of the 
orientation/estimation hypothesis

Mennemeier, Mark; Vezey, Elsie; Lamar, Melissa; Jewell, George

doi:10.1017/s1355617701020100

Cited by 7 publications

(1 citation statement)

References 30 publications

(71 reference statements)

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“…Orienting attention to one end of a line promotes an inaccurate estimation of line length, whereby underestimations result in undershooting center (bias toward left of center) and overestimations result in overshooting center (bias toward right of center; Mennemeier et al, 2005). Though deficiencies in orienting attention and estimating line length may be characteristic of unilateral spatial neglect, such effects are not exclusive to hemineglect (Mennemeier, Vezey, Chatterjee, Rapcsak, & Heilman, 1997; Mennemeier, Vezey, Lamar, & Jewell, 2002). The pathology of PD may impact the ability to effectively coordinate attention and line estimation.…”

Section: Discussionmentioning

confidence: 99%

Spatial judgment in Parkinson’s disease: Contributions of attentional and executive dysfunction.

Salazar¹,

Moon²,

Neargarder

et al. 2019

Behavioral Neuroscience

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Introduction: Spatial judgment is impaired in Parkinson's disease (PD), with previous research suggesting that disruptions in attention and executive function are likely contributors. If judgment of center places demands on frontal systems, performance on tests of attention/executive function may correlate with extent of bias in PD, and attentional disturbance may predict inconsistency in spatial judgment. The relation of spatial judgment to attention/executive function may differ for those with leftside vs. right-side motor onset (LPD, RPD), reflecting effects of attentional lateralization. Methods: We assessed 42 RPD, 37 LPD, and 67 healthy control participants with a Landmark task (LM) in which a cursor moved horizontally from the right (right-LM) or left (left-LM). The task was to judge the center of the line. Participants also performed neuropsychological tests of attention and executive function. Results: Landmark group differences were found on left-LM only, with both PD subgroups biased leftward of the control group (RPD p<.05; LPD p<.01; no RPD-LPD difference). For left-LM trials, extent of bias significantly correlated with performance on the cognitive tasks for PD but not for the control group. PD showed greater variability in perceived center than the control group; this variability correlated with performance on the cognitive tasks. Discussion: The correlations between performance on the test of spatial judgment and the tests of attention/executive function suggest that frontal-based attentional dysfunction affects dynamic spatial judgment, both in extent of spatial bias and in consistency of response as indexed by inter-trial variability.

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Section: Discussionmentioning

confidence: 99%

Spatial judgment in Parkinson’s disease: Contributions of attentional and executive dysfunction.

Salazar¹,

Moon²,

Neargarder

et al. 2019

Behavioral Neuroscience

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Crossover by Line Length and Spatial Location

Mennemeier

Rapcsak²,

Pierce

et al. 2001

Brain and Cognition

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It is well known that line length has a systematic influence on line bisection error in neglect. Most patients with neglect misbisect long lines on the same side of true center as their brain lesion but then cross over on short lines, misbisecting them on the opposite side (i.e., crossover by line length). What is less recognized is that the spatial location of lines relative to the viewer can similarly induce a crossover effect when one considers line bisection error scores that have been averaged across individual line lengths. Patients with right hemisphere injury and neglect classically make averaged line bisection errors that fall right of true center on lines located either at midline or to the left of the viewer; however, we observed that the averaged line bisection error can fall left of true center when lines are located to the right of the viewer (i.e., crossover by spatial location). We hypothesized that crossover by both line length and spatial location stem from systematic errors in magnitude estimation, i.e., perceived line length. We tested predictions based on this hypothesis by examining how the crossover effect by line length is altered by the spatial location of lines along a horizontal axis relative to the viewer. Participants included patients with unilateral lesions of the right and left cerebral hemispheres and age-appropriate normal subjects. All groups demonstrated a crossover effect by line length at the midline location but the effect was altered by placing lines to the right and left of the viewer. In particular, patients with right hemisphere injury and neglect crossed-over across a broader range of line lengths when the lines were located to the right of the viewer rather than at either midline or left of the viewer. It is proposed that mental representations of stimulus magnitude are altered in neglect, in addition to mental representations of space, and that traditional accounts of neglect can be enhanced by including the psychophysical concept of magnitude estimation.

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Disorders of Sensory Selective Attention

Cohen

2013

The Neuropsychology of Attention

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Crossover is not a consequence of neglect: A test of the orientation/estimation hypothesis

Cited by 7 publications

References 30 publications

Spatial judgment in Parkinson’s disease: Contributions of attentional and executive dysfunction.

Spatial judgment in Parkinson’s disease: Contributions of attentional and executive dysfunction.

Crossover by Line Length and Spatial Location

Disorders of Sensory Selective Attention

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