scholarly journals A Dissociation of Encoding and Retrieval Processes in the Human Hippocampus

2005 ◽  
Vol 25 (13) ◽  
pp. 3280-3286 ◽  
Author(s):  
L. L. Eldridge
Keyword(s):  
Human Hippocampus ◽  
Retrieval Processes ◽  
Encoding And Retrieval

Intracranially Recorded Memory-related Potentials Reveal Higher Posterior than Anterior Hippocampal Involvement in Verbal Encoding and Retrieval

2008 ◽  
Vol 20 (5) ◽  
pp. 841-851 ◽  
Author(s):  
Eva Ludowig ◽  
Peter Trautner ◽  
Martin Kurthen ◽  
Carlo Schaller ◽  
Christian G. Bien ◽  
...  
Keyword(s):  
Longitudinal Axis ◽  
Negative Component ◽  
Presurgical Evaluation ◽  
New Words ◽  
Depth Electrodes ◽  
Human Hippocampus ◽  
Retrieval Processes ◽  
Related Potentials ◽  
Successful Retrieval ◽  
Encoding And Retrieval

The human hippocampus is essential for both encoding and recollection, but it remains controversial whether there is a functionally different involvement of anterior versus posterior parts of the hippocampus in these memory processes. In the present study, we examined encoding and retrieval processes via intrahippocampal recordings in 27 patients with unilateral temporal lobe epilepsy. Multicontact depth electrodes were implanted along the longitudinal axis of the hippocampus as part of the presurgical evaluation. In a continuous word recognition test, subjects had to indicate whether words were new or already presented. Recognized old words, as compared to new words, resulted in a larger P600 component, as well as in a larger late negative component (LNC, 600–900 msec). In addition, subsequently remembered words elicited a larger positivity (400 to 900 msec) than later forgotten words. We found differences concerning the distribution along the hippocampus for the LNC old-new effect, reflecting successful retrieval, as well as for the subsequent memory effect, reflecting successful encoding. Both effects were larger the further posterior an electrode was located in the hippocampus. Findings are suggestive for a predominant posterior hippocampal involvement in both verbal encoding and retrieval.

Impaired Social Processing in Autism and its Reflections in Memory: A Deeper View of Encoding and Retrieval Processes

2013 ◽  
Vol 44 (5) ◽  
pp. 1183-1192 ◽  
Author(s):  
Rachel S. Brezis ◽  
Tal Galili ◽  
Tiffany Wong ◽  
Judith I. Piggot
Keyword(s):  
Social Processing ◽  
Retrieval Processes ◽  
Encoding And Retrieval

scholarly journals Mnemonic prediction errors bias hippocampal states

2019 ◽  
Author(s):  
Oded Bein ◽  
Katherine Duncan ◽  
Lila Davachi
Keyword(s):  
Prediction Errors ◽  
Memory Updating ◽  
Hippocampal Subfields ◽  
Retrieval Processes ◽  
The World ◽  
Encoding And Retrieval

AbstractIn situations when our experience violates our predictions, it is adaptive to upregulate encoding of novel information, while down-weighting retrieval of erroneous memory predictions to promote an updated representation of the world. We asked whether mnemonic prediction errors promote distinct hippocampal processing ‘states’ by leveraging recent results showing that encoding and retrieval processes are supported by distinct patterns of connectivity, or ‘states’, across hippocampal subfields. During fMRI scanning, participants were cued to retrieve well-learned room-images and were then presented with either an image identical to the learned room or a modified version (1-4 changes). We found that CA1-entorhinal connectivity increased, and CA1-CA3 connectivity decreased, with the number of changes to the learned rooms. Further, stronger memory predictions measured in CA1 during the cue correlated with the CA1-entorhinal connectivity increase in response to violations. Our findings provide a mechanism by which mnemonic prediction errors may drive memory updating - by biasing hippocampal states.

scholarly journals Asymmetry between encoding and retrieval processes: Evidence from divided attention and a calibration analysis

2000 ◽  
Vol 28 (6) ◽  
pp. 965-976 ◽  
Author(s):  
Moshe Naveh-Benjamin ◽  
Fergus I. M. Craik ◽  
Dana Gavrilescu ◽  
Nicole D. Anderson
Keyword(s):  
Divided Attention ◽  
Retrieval Processes ◽  
Encoding And Retrieval

Dual Task Demands On Encoding And Retrieval Processes: Evidence From Healthy Adult Ageing

Cortex ◽  
2007 ◽  
Vol 43 (1) ◽  
pp. 159-169 ◽  
Author(s):  
Robert H. Logie ◽  
Sergio Della Sala ◽  
Sarah E. MacPherson ◽  
Janine Cooper
Keyword(s):  
Dual Task ◽  
Healthy Adult ◽  
Task Demands ◽  
Retrieval Processes ◽  
Encoding And Retrieval
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