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Quantifying the interactions between allo- and egocentric representations of space.
Acta Psychol (Amst). 2005 Jan-Feb; 118(1-2):25-45.AP

Abstract

Under many circumstances, humans do not judge the location of objects in space where they really are. For instance, when a background is added to a target object, the judged position of a target with respect to oneself (egocentric position) is shifted in the opposite direction as the placement of such a background with respect to the body midline. It is an ongoing debate whether such effects are due to a uni- or bi-directional interaction between allo- and egocentric spatial representations in the brain, or reflect a response strategy, known as the perceived midline shift. In this study, the effects of allocentric stimulus coordinates on perceived egocentric position were examined more precisely and in a quantitative manner. Furthermore, it was investigated whether the judged allocentric position (with respect to a background) is also influenced by the egocentric position in space of that object. Allo- and egocentric coordinates were varied independently. Also, the effect of background luminance on the observed interactions between spatial coordinates was determined. Since background luminance had an effect on the size of the interaction between allocentric stimulus coordinates and egocentric judgments, and no reverse interaction was found, it seems that interactions between ego- and allocentric reference frames is most likely only unidirectional, with the latter affecting the former. This interaction effect was described in a quantitative manner.

Authors+Show Affiliations

Psychological Laboratory, Department of Psychonomics, Helmholtz Institute, Utrecht University, Heidelberglaan 2, 3584 CS Utrecht, The Netherlands. b.neggers@fss.uu.nlNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

15627408

Citation

Neggers, Sebastiaan F W., et al. "Quantifying the Interactions Between Allo- and Egocentric Representations of Space." Acta Psychologica, vol. 118, no. 1-2, 2005, pp. 25-45.
Neggers SF, Schölvinck ML, van der Lubbe RH, et al. Quantifying the interactions between allo- and egocentric representations of space. Acta Psychol (Amst). 2005;118(1-2):25-45.
Neggers, S. F., Schölvinck, M. L., van der Lubbe, R. H., & Postma, A. (2005). Quantifying the interactions between allo- and egocentric representations of space. Acta Psychologica, 118(1-2), 25-45.
Neggers SF, et al. Quantifying the Interactions Between Allo- and Egocentric Representations of Space. Acta Psychol (Amst). 2005 Jan-Feb;118(1-2):25-45. PubMed PMID: 15627408.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Quantifying the interactions between allo- and egocentric representations of space. AU - Neggers,Sebastiaan F W, AU - Schölvinck,Marieke L, AU - van der Lubbe,Rob H J, AU - Postma,Albert, Y1 - 2004/11/23/ PY - 2005/1/4/pubmed PY - 2005/3/4/medline PY - 2005/1/4/entrez SP - 25 EP - 45 JF - Acta psychologica JO - Acta Psychol (Amst) VL - 118 IS - 1-2 N2 - Under many circumstances, humans do not judge the location of objects in space where they really are. For instance, when a background is added to a target object, the judged position of a target with respect to oneself (egocentric position) is shifted in the opposite direction as the placement of such a background with respect to the body midline. It is an ongoing debate whether such effects are due to a uni- or bi-directional interaction between allo- and egocentric spatial representations in the brain, or reflect a response strategy, known as the perceived midline shift. In this study, the effects of allocentric stimulus coordinates on perceived egocentric position were examined more precisely and in a quantitative manner. Furthermore, it was investigated whether the judged allocentric position (with respect to a background) is also influenced by the egocentric position in space of that object. Allo- and egocentric coordinates were varied independently. Also, the effect of background luminance on the observed interactions between spatial coordinates was determined. Since background luminance had an effect on the size of the interaction between allocentric stimulus coordinates and egocentric judgments, and no reverse interaction was found, it seems that interactions between ego- and allocentric reference frames is most likely only unidirectional, with the latter affecting the former. This interaction effect was described in a quantitative manner. SN - 0001-6918 UR - https://www.unboundmedicine.com/medline/citation/15627408/Quantifying_the_interactions_between_allo__and_egocentric_representations_of_space_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0001-6918(04)00100-3 DB - PRIME DP - Unbound Medicine ER -