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Illusions in action: consequences of inconsistent processing of spatial attributes.
Exp Brain Res. 2002 Nov; 147(2):135-44.EB

Abstract

Many authors have performed experiments in which subjects grasp objects in illusory surroundings. The vast majority of these studies report that illusions affect the maximum grip aperture less than they affect the perceived size. This observation has frequently been regarded as experimental evidence for separate visual systems for perception and action. In order to make this conclusion, one assumes that the grip aperture is based on a visual estimate of the object's size. We believe that it is not, and that this is why size illusions fail to influence grip aperture. Illusions generally do not affect all aspects of space perception in a consistent way, but mainly affect the perception of specific spatial attributes. This applies not only to object size, but also to other spatial attributes such as position, orientation, displacement, speed, and direction of motion. Whether an illusion influences the execution of a task will therefore depend on which spatial attributes are used rather than on whether the task is perceptual or motor. To evaluate whether illusions affect actions when they influence the relevant spatial attributes we review experimental results on various tasks with inconsistent spatial processing in mind. Doing so shows that many actions are susceptible to visual illusions. We argue that the frequently reported differential effect of illusions on perceptual judgements and goal-directed action is caused by failures to ensure that the same spatial attributes are used in the two tasks. Illusions only affect those aspects of a task that are based on the spatial attributes that are affected by the illusion.

Authors+Show Affiliations

Afdeling Neurowetenschappen, Erasmus MC, Postbus 1738, 3000 DR Rotterdam, The Netherlands. smeets@fys.fgg.eur.nlNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Review

Language

eng

PubMed ID

12410328

Citation

Smeets, Jeroen B J., et al. "Illusions in Action: Consequences of Inconsistent Processing of Spatial Attributes." Experimental Brain Research, vol. 147, no. 2, 2002, pp. 135-44.
Smeets JB, Brenner E, de Grave DD, et al. Illusions in action: consequences of inconsistent processing of spatial attributes. Exp Brain Res. 2002;147(2):135-44.
Smeets, J. B., Brenner, E., de Grave, D. D., & Cuijpers, R. H. (2002). Illusions in action: consequences of inconsistent processing of spatial attributes. Experimental Brain Research, 147(2), 135-44.
Smeets JB, et al. Illusions in Action: Consequences of Inconsistent Processing of Spatial Attributes. Exp Brain Res. 2002;147(2):135-44. PubMed PMID: 12410328.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Illusions in action: consequences of inconsistent processing of spatial attributes. AU - Smeets,Jeroen B J, AU - Brenner,Eli, AU - de Grave,Denise D J, AU - Cuijpers,Raymond H, Y1 - 2002/09/28/ PY - 2001/09/25/received PY - 2002/06/12/accepted PY - 2002/11/1/pubmed PY - 2003/3/7/medline PY - 2002/11/1/entrez SP - 135 EP - 44 JF - Experimental brain research JO - Exp Brain Res VL - 147 IS - 2 N2 - Many authors have performed experiments in which subjects grasp objects in illusory surroundings. The vast majority of these studies report that illusions affect the maximum grip aperture less than they affect the perceived size. This observation has frequently been regarded as experimental evidence for separate visual systems for perception and action. In order to make this conclusion, one assumes that the grip aperture is based on a visual estimate of the object's size. We believe that it is not, and that this is why size illusions fail to influence grip aperture. Illusions generally do not affect all aspects of space perception in a consistent way, but mainly affect the perception of specific spatial attributes. This applies not only to object size, but also to other spatial attributes such as position, orientation, displacement, speed, and direction of motion. Whether an illusion influences the execution of a task will therefore depend on which spatial attributes are used rather than on whether the task is perceptual or motor. To evaluate whether illusions affect actions when they influence the relevant spatial attributes we review experimental results on various tasks with inconsistent spatial processing in mind. Doing so shows that many actions are susceptible to visual illusions. We argue that the frequently reported differential effect of illusions on perceptual judgements and goal-directed action is caused by failures to ensure that the same spatial attributes are used in the two tasks. Illusions only affect those aspects of a task that are based on the spatial attributes that are affected by the illusion. SN - 0014-4819 UR - https://www.unboundmedicine.com/medline/citation/12410328/Illusions_in_action:_consequences_of_inconsistent_processing_of_spatial_attributes_ L2 - https://dx.doi.org/10.1007/s00221-002-1185-7 DB - PRIME DP - Unbound Medicine ER -