Differential engagement of brain regions within a 'core' network during scene construction.
1501 - 1509.
Reliving past events and imagining potential future events engages a well-established "core" network of brain areas. How the brain constructs, or reconstructs, these experiences or scenes has been debated extensively in the literature, but remains poorly understood. Here we designed a novel task to investigate this (re)constructive process by directly exploring how naturalistic scenes are built up from their individual elements. We "slowed-down" the construction process through the use of auditorily presented phrases describing single scene elements in a serial manner. Participants were required to integrate these elements (ranging from three to six in number) together in their imagination to form a naturalistic scene. We identified three distinct sub-networks of brain areas, each with different fMRI BOLD response profiles, favouring specific points in the scene construction process. Areas including the hippocampus and retrosplenial cortex had a biphasic profile, activating when a single scene element was imagined and when 3 elements were combined together; regions including the intra-parietal sulcus and angular gyrus steadily increased activity from 1 to 3 elements; while activity in areas such as lateral prefrontal cortex was observed from the second element onwards. Activity in these sub-networks did not increase further when integrating more than three elements. Participants confirmed that three elements were sufficient to construct a coherent and vivid scene, and once this was achieved, the addition of further elements only involved maintenance or small changes to that established scene. This task offers a potentially useful tool for breaking down scene construction, a process that may be key to a range of cognitive functions such as episodic memory, future thinking and navigation. (C) 2010 Elsevier Ltd. All rights reserved.
|Title:||Differential engagement of brain regions within a 'core' network during scene construction|
|Open access status:||An open access publication|
|Publisher version:||http://www.ncbi.nlm.nih.gov/pmc/ articles/PMC28503...|
|Keywords:||Scene construction, fMRI, Episodic, Memory, Future thinking, Hippocampus, Autobiographical, Objects, MEDIAL TEMPORAL-LOBES, OBJECT WORKING-MEMORY, EPISODIC MEMORY, AUTOBIOGRAPHICAL MEMORIES, MENTAL REPRESENTATIONS, COGNITIVE NEUROSCIENCE, HUMAN HIPPOCAMPUS, VISUAL CONTEXT, NEURAL SYSTEM, FUTURE|
|UCL classification:||UCL > School of Life and Medical Sciences > Faculty of Brain Sciences > Institute of Neurology > Imaging Neuroscience
UCL > School of Life and Medical Sciences > Faculty of Life Sciences > Gatsby Computational Neuroscience Unit
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