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Dissociation between Dorsal and Ventral Posterior Parietal Cortical Responses to Incidental Changes in Natural ScenesOpen URL for this publicationDOI for this publication

Howard, LR; Kumaran, D; Ólafsdóttir, HF; Spiers, HJ; (2013) Dissociation between Dorsal and Ventral Posterior Parietal Cortical Responses to Incidental Changes in Natural ScenesOpen URL for this publicationDOI for this publication. PLoS One , 8 (7) , Article e67988. 10.1371/journal.pone.0067988. Green open access

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Abstract

Background The posterior parietal cortex (PPC) is thought to interact with the medial temporal lobe (MTL) to support spatial cognition and topographical memory. While the response of medial temporal lobe regions to topographical stimuli has been intensively studied, much less research has focused on the role of PPC and its functional connectivity with the medial temporal lobe. Methodology/Principle Findings Here we report a dissociation between dorsal and ventral regions of PPC in response to different types of change in natural scenes using an fMRI adaptation paradigm. During scanning subjects performed an incidental target detection task whilst viewing trial unique sequentially presented pairs of natural scenes, each containing a single prominent object. We observed a dissociation between the superior parietal gyrus and the angular gyrus, with the former showing greater sensitivity to spatial change, and the latter showing greater sensitivity to scene novelty. In addition, we observed that the parahippocampal cortex has increased functional connectivity with the angular gyrus, but not superior parietal gyrus, when subjects view change to the scene content. Conclusions/Significance Our findings provide support for proposed dissociations between dorsal and ventral regions of PPC and suggest that the dorsal PPC may support the spatial coding of the visual environment even when this information is incidental to the task at hand. Further, through revealing the differential functional interactions of the SPG and AG with the MTL our results help advance our understanding of how the MTL and PPC cooperate to update representations of the world around us.

Type: Article
Title: Dissociation between Dorsal and Ventral Posterior Parietal Cortical Responses to Incidental Changes in Natural ScenesOpen URL for this publicationDOI for this publication
Open access status: An open access version is available from UCL Discovery
DOI: 10.1371/journal.pone.0067988
Publisher version: http://dx.doi.org/10.1371/journal.pone.0067988
Language: English
Additional information: © 2013 Howard et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences > Experimental Psychology
URI: https://discovery.ucl.ac.uk/id/eprint/1413227
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