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Updated: May 12, 2026

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

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Published on: April 16, 2014

Neglect's perspective on the Ponzo illusion.

A Sedda1, E R Ferrè, C L Striemer

  • 1Department of Brain and Behavioural Sciences, University of Pavia, Piazza Botta 11, 27100 Pavia, Italy. anna.sedda@unipv.it

Experimental Brain Research
|April 24, 2013
PubMed
Summary

Patients with neglect may perceive depth illusions like the Ponzo illusion using only right-sided visual input. This suggests caution when using visual illusions to study implicit perception in neglect.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Visual illusions offer insights into implicit perception in neglect.
  • Previous research differentiated length and surface illusions in neglect, but depth illusion perception remains less understood.
  • The Ponzo illusion, a depth illusion, involves converging lines influencing perceived length.

Purpose of the Study:

  • To investigate how patients with neglect process depth illusions.
  • To determine if awareness of both converging lines is essential for the full effect of the Ponzo illusion.
  • To explore the role of stimulus laterality in depth illusion perception for neglect patients.

Main Methods:

  • Modified Ponzo illusions with single converging lines (left or right) were presented.
  • Participants included healthy controls, patients with neglect, and right brain-damaged patients.
  • Perceptual judgments of line length were recorded across four conditions: classic Ponzo, modified left, modified right, and control.

Main Results:

  • All participants perceived the classic and modified right Ponzo illusions.
  • Patients with neglect failed to perceive the modified left Ponzo illusion.
  • Neglect patients showed no difference in illusion strength between classic and modified right conditions.
  • Variability in neglect patients correlated with occipital lobe damage.

Conclusions:

  • The classic Ponzo illusion may be perceived by neglect patients based on right-sided stimulus processing.
  • Depth illusion perception in neglect is influenced by stimulus laterality.
  • Variability and differing illusion effects highlight the need for careful use of illusions in assessing implicit processing in neglect.