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Delayed pointing movements to masked Müller-Lyer figures are affected by target size but not the illusion.
Neuropsychologia. 2011 Jun; 49(7):1903-9.N

Abstract

There is ongoing debate with respect to interpretation of the finding that, in contrast to perceptual size judgments, actions are relatively unaffected by the Müller-Lyer illusion. In normal unrestricted viewing situations observers cannot perform an action directed at an object without simultaneously perceiving the object - this makes it difficult to unequivocally establish whether observed effects are a function of vision for perception, vision for action, a combination of both, or of a single all-purpose visual system. However, there is evidence that observers are capable of performing actions towards objects of which they are not consciously aware, implying that two distinct visual thresholds may exist; one accompanying vision for action and one accompanying vision for perception. To investigate this possibility we created a situation in which visual information was presented below the perception threshold, but above the purported action threshold, allowing examination of action responses independent of contributions from vision for perception. Following a perceptual categorization task, participants performed delayed pointing movements towards briefly exposed masked Müller-Lyer targets of different sizes. When the targets were presented below the perception threshold, participants were unable to discriminate between them, yet their delayed pointing movements were affected by target size (but not the illusion). The results imply that vision for action is functional even after a delay and/or that the pickup of egocentric information is associated with a lower visual threshold than the pickup of allocentric information.

Authors+Show Affiliations

Institute of Human Performance, University of Hong Kong, 111-113 Pokfulam Road, Hong Kong SAR, China. dewitm@hku.hkNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

21420989

Citation

de Wit, Matthieu, et al. "Delayed Pointing Movements to Masked Müller-Lyer Figures Are Affected By Target Size but Not the Illusion." Neuropsychologia, vol. 49, no. 7, 2011, pp. 1903-9.
de Wit M, van der Kamp J, Masters RS. Delayed pointing movements to masked Müller-Lyer figures are affected by target size but not the illusion. Neuropsychologia. 2011;49(7):1903-9.
de Wit, M., van der Kamp, J., & Masters, R. S. (2011). Delayed pointing movements to masked Müller-Lyer figures are affected by target size but not the illusion. Neuropsychologia, 49(7), 1903-9. https://doi.org/10.1016/j.neuropsychologia.2011.03.017
de Wit M, van der Kamp J, Masters RS. Delayed Pointing Movements to Masked Müller-Lyer Figures Are Affected By Target Size but Not the Illusion. Neuropsychologia. 2011;49(7):1903-9. PubMed PMID: 21420989.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Delayed pointing movements to masked Müller-Lyer figures are affected by target size but not the illusion. AU - de Wit,Matthieu, AU - van der Kamp,John, AU - Masters,Rich S W, Y1 - 2011/03/21/ PY - 2010/04/09/received PY - 2011/03/04/revised PY - 2011/03/14/accepted PY - 2011/3/23/entrez PY - 2011/3/23/pubmed PY - 2011/9/14/medline SP - 1903 EP - 9 JF - Neuropsychologia JO - Neuropsychologia VL - 49 IS - 7 N2 - There is ongoing debate with respect to interpretation of the finding that, in contrast to perceptual size judgments, actions are relatively unaffected by the Müller-Lyer illusion. In normal unrestricted viewing situations observers cannot perform an action directed at an object without simultaneously perceiving the object - this makes it difficult to unequivocally establish whether observed effects are a function of vision for perception, vision for action, a combination of both, or of a single all-purpose visual system. However, there is evidence that observers are capable of performing actions towards objects of which they are not consciously aware, implying that two distinct visual thresholds may exist; one accompanying vision for action and one accompanying vision for perception. To investigate this possibility we created a situation in which visual information was presented below the perception threshold, but above the purported action threshold, allowing examination of action responses independent of contributions from vision for perception. Following a perceptual categorization task, participants performed delayed pointing movements towards briefly exposed masked Müller-Lyer targets of different sizes. When the targets were presented below the perception threshold, participants were unable to discriminate between them, yet their delayed pointing movements were affected by target size (but not the illusion). The results imply that vision for action is functional even after a delay and/or that the pickup of egocentric information is associated with a lower visual threshold than the pickup of allocentric information. SN - 1873-3514 UR - https://www.unboundmedicine.com/medline/citation/21420989/Delayed_pointing_movements_to_masked_Müller_Lyer_figures_are_affected_by_target_size_but_not_the_illusion_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0028-3932(11)00149-7 DB - PRIME DP - Unbound Medicine ER -