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Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/7337

Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: Transient activation during block transition
Author(s): Konishi, Seiki
Donaldson, David
Buckner, Randy
Contact Email: d.i.donaldson@stir.ac.uk
Issue Date: Feb-2001
Publisher: Elsevier
Citation: Konishi S, Donaldson D & Buckner R (2001) Transient activation during block transition, NeuroImage, 13 (2), pp. 364-374.
Abstract: Functional MRI (fMRI) data analysis of blocked-task paradigms typically considers brain activity present across a temporally extended task block relative to a reference block. An open question remains as to whether processes evolving with distinct temporal profiles are also present and can inform us about further functional–anatomic processes underlying task performance. To explore this question, a meta-analysis of data from these separate studies was performed. The meta-analysis specifically focused on detecting transient activation occurring at the onset and offset of task blocks. The composite data set from 39 subjects included four distinct task conditions (from various intentional encoding paradigms) that had equivalent block timing. Task block activation included a network of regions consistent with prior analyses of intentional encoding. Activation related to the block transitions included a set of transiently activated regions, consistent across all four separate task conditions. The most prominent activation was found in right frontal cortex along the dorsal extent of inferior frontal gyrus (near BA 6/44). Importantly, in one condition, this transient activation was present in the absence of a response across the task block suggesting dissociation between processes in support of ongoing task demands and those associated with transitions between blocks. Other prominent transient activations included posterior superior temporal sulcus, medial occipitoparietal sulcus, anterior insula, and anterior cingulate sulcus in the right hemisphere. These findings are discussed in relation to models of set shifting and competitive interactions between brain region
Type: Journal Article
URI: http://hdl.handle.net/1893/7337
DOI Link: http://dx.doi.org/10.1006/nimg.2000.0691
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Washington University In Saint Louis
Psychology
Washington University In Saint Louis

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