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Interactions between ego- and allocentric neuronal representations of space.
Neuroimage. 2006 May 15; 31(1):320-31.N

Abstract

In the primate brain, visual spatial representations express distances of objects with regard to different references. In the parietal cortex, distances are thought to be represented with respect to the body (egocentric representation) and in superior temporal cortices with respect to other objects, independent of the observer (allocentric representation). However, these representations of space are interdependent, complicating such distinctions. Specifically, an object's position within a background frame strongly biases egocentric position location judgments. This bias, however, is absent for pointing movements towards that same object. More recent theories state that dorsal parietal spatial representations subserve visuomotor processing, whereas temporal lobe representations subserve memory and cognition. Therefore, it may be hypothesized that parietal egocentric representations, responsible for movement control, are not influenced by irrelevant allocentric cues, whereas ventral representations are. In an event-related functional magnetic resonance imaging study, subjects judged target bar locations relative to their body (egocentric task) or a background bar (allocentric task). Activity in the superior parietal lobule (SPL) was shown to increase during egocentric judgments, but not during allocentric judgments. The superior temporal gyrus (STG) shows a negative BOLD response during allocentric judgments and no activation during egocentric judgments. During egocentric judgments, the irrelevant background influenced activity in the posterior commissure and the medial temporal gyrus. SPL activity was unaffected by the irrelevant background during egocentric judgments. Sensitivity to spatial perceptual biases is apparently limited to occipito-temporal areas, subserving the observed biased cognitive reports of location, and is not found in parietal areas, subserving unbiased goal-directed actions.

Authors+Show Affiliations

Department of Psychonomics, Helmholtz Institute, University of Utrecht, 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

16473025

Citation

Neggers, S F W., et al. "Interactions Between Ego- and Allocentric Neuronal Representations of Space." NeuroImage, vol. 31, no. 1, 2006, pp. 320-31.
Neggers SF, Van der Lubbe RH, Ramsey NF, et al. Interactions between ego- and allocentric neuronal representations of space. Neuroimage. 2006;31(1):320-31.
Neggers, S. F., Van der Lubbe, R. H., Ramsey, N. F., & Postma, A. (2006). Interactions between ego- and allocentric neuronal representations of space. NeuroImage, 31(1), 320-31.
Neggers SF, et al. Interactions Between Ego- and Allocentric Neuronal Representations of Space. Neuroimage. 2006 May 15;31(1):320-31. PubMed PMID: 16473025.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Interactions between ego- and allocentric neuronal representations of space. AU - Neggers,S F W, AU - Van der Lubbe,R H J, AU - Ramsey,N F, AU - Postma,A, Y1 - 2006/02/09/ PY - 2005/07/31/received PY - 2005/12/04/revised PY - 2005/12/06/accepted PY - 2006/2/14/pubmed PY - 2006/9/26/medline PY - 2006/2/14/entrez SP - 320 EP - 31 JF - NeuroImage JO - Neuroimage VL - 31 IS - 1 N2 - In the primate brain, visual spatial representations express distances of objects with regard to different references. In the parietal cortex, distances are thought to be represented with respect to the body (egocentric representation) and in superior temporal cortices with respect to other objects, independent of the observer (allocentric representation). However, these representations of space are interdependent, complicating such distinctions. Specifically, an object's position within a background frame strongly biases egocentric position location judgments. This bias, however, is absent for pointing movements towards that same object. More recent theories state that dorsal parietal spatial representations subserve visuomotor processing, whereas temporal lobe representations subserve memory and cognition. Therefore, it may be hypothesized that parietal egocentric representations, responsible for movement control, are not influenced by irrelevant allocentric cues, whereas ventral representations are. In an event-related functional magnetic resonance imaging study, subjects judged target bar locations relative to their body (egocentric task) or a background bar (allocentric task). Activity in the superior parietal lobule (SPL) was shown to increase during egocentric judgments, but not during allocentric judgments. The superior temporal gyrus (STG) shows a negative BOLD response during allocentric judgments and no activation during egocentric judgments. During egocentric judgments, the irrelevant background influenced activity in the posterior commissure and the medial temporal gyrus. SPL activity was unaffected by the irrelevant background during egocentric judgments. Sensitivity to spatial perceptual biases is apparently limited to occipito-temporal areas, subserving the observed biased cognitive reports of location, and is not found in parietal areas, subserving unbiased goal-directed actions. SN - 1053-8119 UR - https://www.unboundmedicine.com/medline/citation/16473025/Interactions_between_ego__and_allocentric_neuronal_representations_of_space_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1053-8119(05)02535-8 DB - PRIME DP - Unbound Medicine ER -