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Related Concept Videos

Visual Agnosia01:12

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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
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Related Experiment Video

Updated: May 21, 2026

Driving Simulation in the Clinic: Testing Visual Exploratory Behavior in Daily Life Activities in Patients with Visual Field Defects
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Visual distraction: an altered aiming spatial response in dementia.

Elizabeth E Galletta1, Anthony H Lequerica, Scott R Pekrul

  • 1Kessler Foundation Research Center, West Orange, N.J., USA.

Dementia and Geriatric Cognitive Disorders Extra
|June 29, 2012
PubMed
Summary

Patients with probable Alzheimer-type dementia (pAD) show altered visuospatial processing, exhibiting greater rightward aiming errors in line bisection tasks compared to controls, particularly with distraction.

Keywords:
Aiming errorLine bisectionVisual distractionWhere error

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Visuospatial tasks like line bisection reveal a leftward bias in healthy individuals, often linked to right-brain dominance.
  • Probable dementia of the Alzheimer type (pAD) involves neurodegeneration in temporoparietal regions, potentially impacting visuospatial abilities.

Purpose of the Study:

  • To investigate visuospatial bias in patients with probable dementia of the Alzheimer type (pAD).
  • To compare motor-preparatory aiming in pAD patients versus matched controls on a line bisection task.

Main Methods:

  • A line bisection task was administered to subjects with pAD and healthy controls.
  • The task was performed in near and far space, with and without visual distraction (left or right-sided).

Main Results:

  • Participants with pAD demonstrated distinct motor-preparatory spatial bias compared to controls.
  • Significantly more rightward aiming errors were observed in pAD patients, especially without distraction and with right-sided distraction.

Conclusions:

  • Distraction may induce altered motor-preparatory brain activity in pAD subjects.
  • This suggests a difference in visual-motor function and spatial bias between pAD patients and controls.