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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

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"...
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.

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Related Experiment Video

Updated: May 20, 2026

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection
07:04

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection

Published on: March 10, 2021

Spatial neglect and perseveration in visuomotor exploration.

Roberta Ronchi1, Lorella Algeri, Laura Chiapella

  • 1Department of Psychology, University of Milano-Bicocca, 20126 Milano, Italy. r.ronchi@auxologico.it

Neuropsychology
|July 11, 2012
PubMed
Summary

Right-brain damage can cause spatial neglect and perseveration errors in cancellation tasks. Scattered, nonverbal targets, like stars, increase these errors, with right insula damage linked to perseveration.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Right-brain-damaged patients with left spatial neglect exhibit perseveration errors in target cancellation tasks.
  • Previous research suggests stimulus disposition influences error frequency, with stars potentially eliciting more errors than letters.

Purpose of the Study:

  • To investigate how target organization (scattered vs. arranged) and type (stars vs. letters) affect omission and perseveration errors.
  • To examine the role of divided attentional resources in these errors.
  • To identify lesion correlates of perseveration.

Main Methods:

  • Thirty-three right-brain-damaged patients (with and without neglect) performed star and letter cancellation tasks with scattered or arranged stimuli.
  • A dual task was administered to assess divided attention deficits.

Main Results:

  • Scattered target disposition significantly increased both omission and perseveration errors.
  • Perseveration was more frequent with scattered, nonverbal (star) targets.
  • Perseveration errors were not linked to deficits in divided attention.
  • Lesion analysis identified damage to the right insula as a correlate of perseveration.

Conclusions:

  • Target type and spatial organization differentially modulate omission and perseveration errors.
  • Perseveration in spatial neglect is not solely explained by deficits in divided attention.
  • Right insula damage is implicated as a neural correlate of motor perseveration in spatial neglect.