Visuomotor 'immunity' to perceptual illusion: A mismatch of attentional demands cannot explain the perception-action dissociation

M T Dewar, David Peter Matthew Carey

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Recent findings of visuomotor immunity division of labour within two to perceptual illusions have been attributed to a perception-action anatomically segregated streams in the Visual cortex. However, critics argue that such experimental findings are not valid and have Suggested that the perception-action dissociations can be explained away by differential attentional/processing demands, rather than a functional dissociation in the neurologically intact brain: perceptual tasks require processing of the entire illusion display while visuomotor tasks only require processing, the target that is acted upon. The present study examined whether grasping of the Muller-Lyer display would remain immune to the illusion when the task required the direction of attention or a related resource towards both Muller-Lyer shafts. Twelve participants were required to match and gasp two Muller-Lyer shafts bimanually (i.e. one with each hand). It was found that bimanual grasping was not significantly affected by the illusion, while there was a highly significant illusion effect on perceptual estimation by matching. Furthermore, it was established that this dissociation did not result from a differing baseline rate of change in manual estimation and grasping aperture to a change in physical object size. These findings provide further Support for the Postulated perception-action dissociation and fail to uphold the idea that grasping 'immunity' to the Muller-Lyer illusions merely represents an experimental artefact. (c) 2005 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)1501-1508
Number of pages8
JournalNeuropsychologia
Volume44
Issue number8
DOIs
Publication statusPublished - Dec 2005

Fingerprint

Immunity
Visual Cortex
Artifacts
Hand
Brain

Keywords

  • two visual systems
  • visual illusions
  • grasping
  • perception and action
  • Muller-Lyer illusion
  • Titchener circles illusion
  • movements
  • judgement
  • time

Cite this

Visuomotor 'immunity' to perceptual illusion: A mismatch of attentional demands cannot explain the perception-action dissociation. / Dewar, M T ; Carey, David Peter Matthew.

In: Neuropsychologia, Vol. 44, No. 8, 12.2005, p. 1501-1508.

Research output: Contribution to journalArticle

@article{2ded820d54684e85957847c5d32fc886,
title = "Visuomotor 'immunity' to perceptual illusion: A mismatch of attentional demands cannot explain the perception-action dissociation",
abstract = "Recent findings of visuomotor immunity division of labour within two to perceptual illusions have been attributed to a perception-action anatomically segregated streams in the Visual cortex. However, critics argue that such experimental findings are not valid and have Suggested that the perception-action dissociations can be explained away by differential attentional/processing demands, rather than a functional dissociation in the neurologically intact brain: perceptual tasks require processing of the entire illusion display while visuomotor tasks only require processing, the target that is acted upon. The present study examined whether grasping of the Muller-Lyer display would remain immune to the illusion when the task required the direction of attention or a related resource towards both Muller-Lyer shafts. Twelve participants were required to match and gasp two Muller-Lyer shafts bimanually (i.e. one with each hand). It was found that bimanual grasping was not significantly affected by the illusion, while there was a highly significant illusion effect on perceptual estimation by matching. Furthermore, it was established that this dissociation did not result from a differing baseline rate of change in manual estimation and grasping aperture to a change in physical object size. These findings provide further Support for the Postulated perception-action dissociation and fail to uphold the idea that grasping 'immunity' to the Muller-Lyer illusions merely represents an experimental artefact. (c) 2005 Elsevier Ltd. All rights reserved.",
keywords = "two visual systems, visual illusions, grasping, perception and action, Muller-Lyer illusion, Titchener circles illusion, movements, judgement, time",
author = "Dewar, {M T} and Carey, {David Peter Matthew}",
year = "2005",
month = "12",
doi = "10.1016/j.neuropsychologia.2005.11.010",
language = "English",
volume = "44",
pages = "1501--1508",
journal = "Neuropsychologia",
issn = "0028-3932",
publisher = "Elsevier Limited",
number = "8",

}

TY - JOUR

T1 - Visuomotor 'immunity' to perceptual illusion: A mismatch of attentional demands cannot explain the perception-action dissociation

AU - Dewar, M T

AU - Carey, David Peter Matthew

PY - 2005/12

Y1 - 2005/12

N2 - Recent findings of visuomotor immunity division of labour within two to perceptual illusions have been attributed to a perception-action anatomically segregated streams in the Visual cortex. However, critics argue that such experimental findings are not valid and have Suggested that the perception-action dissociations can be explained away by differential attentional/processing demands, rather than a functional dissociation in the neurologically intact brain: perceptual tasks require processing of the entire illusion display while visuomotor tasks only require processing, the target that is acted upon. The present study examined whether grasping of the Muller-Lyer display would remain immune to the illusion when the task required the direction of attention or a related resource towards both Muller-Lyer shafts. Twelve participants were required to match and gasp two Muller-Lyer shafts bimanually (i.e. one with each hand). It was found that bimanual grasping was not significantly affected by the illusion, while there was a highly significant illusion effect on perceptual estimation by matching. Furthermore, it was established that this dissociation did not result from a differing baseline rate of change in manual estimation and grasping aperture to a change in physical object size. These findings provide further Support for the Postulated perception-action dissociation and fail to uphold the idea that grasping 'immunity' to the Muller-Lyer illusions merely represents an experimental artefact. (c) 2005 Elsevier Ltd. All rights reserved.

AB - Recent findings of visuomotor immunity division of labour within two to perceptual illusions have been attributed to a perception-action anatomically segregated streams in the Visual cortex. However, critics argue that such experimental findings are not valid and have Suggested that the perception-action dissociations can be explained away by differential attentional/processing demands, rather than a functional dissociation in the neurologically intact brain: perceptual tasks require processing of the entire illusion display while visuomotor tasks only require processing, the target that is acted upon. The present study examined whether grasping of the Muller-Lyer display would remain immune to the illusion when the task required the direction of attention or a related resource towards both Muller-Lyer shafts. Twelve participants were required to match and gasp two Muller-Lyer shafts bimanually (i.e. one with each hand). It was found that bimanual grasping was not significantly affected by the illusion, while there was a highly significant illusion effect on perceptual estimation by matching. Furthermore, it was established that this dissociation did not result from a differing baseline rate of change in manual estimation and grasping aperture to a change in physical object size. These findings provide further Support for the Postulated perception-action dissociation and fail to uphold the idea that grasping 'immunity' to the Muller-Lyer illusions merely represents an experimental artefact. (c) 2005 Elsevier Ltd. All rights reserved.

KW - two visual systems

KW - visual illusions

KW - grasping

KW - perception and action

KW - Muller-Lyer illusion

KW - Titchener circles illusion

KW - movements

KW - judgement

KW - time

U2 - 10.1016/j.neuropsychologia.2005.11.010

DO - 10.1016/j.neuropsychologia.2005.11.010

M3 - Article

VL - 44

SP - 1501

EP - 1508

JO - Neuropsychologia

JF - Neuropsychologia

SN - 0028-3932

IS - 8

ER -