title: Encoding strategies dissociate prefrontal activity from working memory demand.
abstract: It is often proposed that prefrontal cortex is important in organization and control of working memory contents. In some cases, effective reorganization can decrease task difficulty, implying a dissociation between frontal activity and basic memory demand. In a spatial working memory task, we studied the improvement of performance that occurs when materials can be reorganized into higher level groups or chunks. Structured sequences, encouraging reorganization and chunking, were compared with unstructured sequences. Though structured sequences were easier to remember, event-related functional magnetic resonance imaging (fMRI) showed increased activation of lateral frontal cortex, in particular during memory encoding. The results show that, even when memory demand decreases, organization of working memory contents into higher level chunks is associated with increased prefrontal activity.
authors.affiliation: Medical Research Council Cognition and Brain Sciences Unit, 15 Chaucer Road, Cambridge CB2 2EF, United Kingdom. daniel.bor@mrc-cbu.cam.ac.uk
authors.forename: Daniel
authors.initials: D
authors.lastname: Bor
authors.forename: John
authors.initials: J
authors.lastname: Duncan
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Wiseman
authors.forename: Adrian M
authors.initials: AM
authors.lastname: Owen
mesh_terms: D000328:Adult; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D008570:Memory, Short-Term / Q000502:physiology*; D017397:Prefrontal Cortex / Q000502:physiology*; D013028:Space Perception / Q000502:physiology