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Related Experiment Videos

Crossover by line length and spatial location.

M Mennemeier1, S Z Rapcsak, C Pierce

  • 1Department of Physical Medicine and Rehabilitation, University of Alabama at Birmingham, AL 35233-7330, USA. markmenn@uab.edu

Brain and Cognition
|December 26, 2001
PubMed
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Patients with neglect exhibit a crossover effect in line bisection, where errors shift based on line length and spatial location. This suggests magnitude estimation errors, not just spatial ones, contribute to neglect.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychophysics

Background:

  • Line bisection error in neglect is influenced by line length, causing patients to misbisect long and short lines differently.
  • Spatial location of lines also affects neglect, with a less recognized crossover effect observed in averaged error scores.

Purpose of the Study:

  • To investigate the hypothesis that crossover effects in line bisection (by length and location) stem from systematic errors in magnitude estimation.
  • To examine how spatial line location alters the crossover effect by line length in patients with unilateral brain lesions and neglect.

Main Methods:

  • Participants included patients with right/left hemisphere lesions and healthy controls.
  • Line bisection tasks were performed with lines varying in length and spatial location (left, midline, right).

Related Experiment Videos

  • Analysis focused on line bisection error scores and crossover effects across conditions.

    • Main Results:

    • All groups showed a crossover effect by line length at midline.
    • Spatial location altered the line length crossover effect, particularly in right hemisphere patients with neglect.
    • Right hemisphere patients with neglect showed a broader crossover range for lines located to the right.

    Conclusions:

    • Crossover effects in neglect appear linked to altered mental representations of stimulus magnitude (perceived length).
    • Traditional accounts of neglect can be enhanced by incorporating the psychophysical concept of magnitude estimation.
    • Findings suggest that both spatial and magnitude estimation processes are affected in neglect.