title: fMRI evidence for dissociation between priming and conscious recognition.
abstract: Evidence from recent studies challenge traditional memory system accounts of separate mechanisms for implicit and explicit memory. The motive behind the present study was to further investigate whether common activations can be detected during explicit and implicit memory performance when using the same procedure for both tasks. Functional magnetic resonance imaging (fMRI) showed separate neural activation to perceptual repetition priming and perceptual recognition of real and nonsense objects, both in terms of the brain regions involved and in the direction of repeated-novel activations. Repetition priming showed deactivation for repeated stimuli in regions not overlapping regions activated in conscious recognition, activation patterns in the two tasks involved largely separate networks. Common activations were observed in three areas, considered as being involved in processes such as stimulus analyses, task monitoring and attention, i.e., processes external to memory. We interpret this as indicating an almost complete dissociation between the networks involved in priming and recognition memory.
authors.affiliation: Department of Psychology, Center for the Study of Human Cognition, University of Oslo, Norway , Oslo University Hospital, Department of Old Age Psychiatry Vardaasen, Slottsberget 35, 1385 Asker, Norway.
authors.forename: M S
authors.initials: MS
authors.lastname: Korsnes
authors.forename: S J
authors.initials: SJ
authors.lastname: Magnussen
mesh_terms: D000328:Adult; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D003243:Consciousness / Q000502:physiology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009483:Neuropsychological Tests; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation; D011930:Reaction Time; D021641:Recognition, Psychology / Q000502:physiology*; D060865:Repetition Priming / Q000502:physiology*; D055815:Young Adult
keywords: Implicit; explicit; fMRI; memory; priming; real and nonsense objects