The neocortical network representing associative memory reorganizes with time in a process engaging the anterior temporal lobe
SourceCerebral Cortex, 22, 11, (2012), pp. 2622-33
Article / Letter to editor
Display more detailsDisplay less details
Donders Centre for Cognitive Neuroimaging
PI Group MR Techniques in Brain Function
PI Group Neuronal Oscillations
F.C. Donders Centre for Cognitive Neuroimaging
Subject130 000 Cognitive Neurology & Memory; 150 000 MR Techniques in Brain Function; 160 000 Neuronal Oscillations; DCN MP - Plasticity and memory
During encoding, the distributed neocortical representations of memory components are presumed to be associatively linked by the hippocampus. With time, a reorganization of brain areas supporting memory takes place, which can ultimately result in memories becoming independent of the hippocampus. While it is theorized that with time, the neocortical representations become linked by higher order neocortical association areas, this remains to be experimentally supported. In this study, 24 human participants encoded sets of face-location associations, which they retrieved 1 or 25 h later ("recent" and "remote" conditions, respectively), while their brain activity was recorded using whole-head magnetoencephalography. We investigated changes in the functional interactions between the neocortical representational areas emerging over time. To assess functional interactions, trial-by-trial high gamma (60-140 Hz) power correlations were calculated between the neocortical representational areas relevant to the encoded information, namely the fusiform face area (FFA) and posterior parietal cortex (PPC). With time, both the FFA and the PPC increased their functional interactions with the anterior temporal lobe (ATL). Given that the ATL is involved in semantic representation of paired associates, our results suggest that, already within 25 h after acquiring new memory associations, neocortical functional links are established via higher order semantic association areas.
Upload full text
Use your RU credentials (u/z-number and password) to log in with SURFconext to upload a file for processing by the repository team.