Reference : Item familiarity and controlled associative retrieval in Alzheimer’s disease: an fMRI...
Scientific congresses and symposiums : Paper published in a book
Social & behavioral sciences, psychology : Neurosciences & behavior
http://hdl.handle.net/2268/131560
Item familiarity and controlled associative retrieval in Alzheimer’s disease: an fMRI study.
English
Genon, Sarah mailto [Université de Liège - ULg > Département des sciences cliniques > Neuroimagerie des troubles de la mémoire et révalid. cogn. >]
Collette, Fabienne [Université de Liège - ULg > Département de Psychologie : cognition et comportement > Neuropsychologie >]
Feyers, Dorothée [Université de Liège - ULg > Département Psychologies et cliniques des systèmes humains > Psychologie de la sénescence >]
Phillips, Christophe [Université de Liège - ULg > > Centre de recherches du cyclotron >]
Salmon, Eric [Université de Liège - ULg > Département des sciences cliniques > Neuroimagerie des troubles de la mémoire et révalid. cogn. >]
Bastin, Christine [Université de Liège - ULg > > Centre de recherches du cyclotron >]
30-Aug-2012
Proceedings of the Amsterdam Memory Slam 2012
16
Yes
Amsterdam Memory Slam 2012
du 30/08/2012 au 31/08/2012
Amsterdam
the Netherlands
[en] Alzheimer’s disease ; episodic memory ; fMRI
[en] Alzheimer’s disease (AD) is characterised by altered recollection function, with impaired controlled retrieval of associations. In contrast, familiarity-based memory for individual items may sometimes be preserved in early stages of the disease. This is the first study that directly examines whole brain regional activity engaged during one core aspect of the recollection function: associative controlled episodic retrieval (CER), contrasted to item familiarity in AD patients. Cerebral activity related to associative CER and item familiarity in AD patients and healthy controls (HC) was measured with functional magnetic resonance imaging during a word-pair recognition task to which the process dissociation procedure was applied. Some patients had null CER estimates (AD-), whereas others did show some CER abilities (AD+) although significantly less than HC. In contrast, familiarity estimates were equivalent in the three groups. In AD+ like in controls, associative CER activated the inferior precuneus/posterior cingulate cortex (PCC). However, during associative CER, functional connection between this region and the hippocampus, the inferior parietal and the dorsolateral prefrontal cortex was significantly higher in HC than in AD+. In the three groups, item familiarity was related to activation along the intraparietal sulcus (IPS). In conclusion, whereas the preserved automatic detection of an old item (without retrieval of accurate word association) is related to a parietal activation centred on the IPS, the inferior precuneus/PCC supports associative CER ability in AD patients as in HC. However, AD patients have deficient functional connectivity during associative CER suggesting that residual recollection function in these patients might be impoverished by lack of some recollection-related aspects such as autonoetic quality, episodic details and verification.
Centre de Recherches du Cyclotron - CRC
http://hdl.handle.net/2268/131560

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