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@ARTICLE{Berron:139871,
author = {Berron, David and Neumann, Katja and Maaß, Anne and
Schütze, Hartmut and Fliessbach, Klaus and Kiven, Verena
and Jessen, Frank and Sauvage, Magdalena and Kumaran,
Dharshan and Düzel, Emrah},
title = {{A}ge-related functional changes in domain-specific medial
temporal lobe pathways.},
journal = {Neurobiology of aging},
volume = {65},
issn = {0197-4580},
address = {Amsterdam [u.a.]},
publisher = {Elsevier Science},
reportid = {DZNE-2020-06193},
pages = {86-97},
year = {2018},
abstract = {There is now converging evidence from studies in animals
and humans that the medial temporal lobes (MTLs) harbor
anatomically distinct processing pathways for object and
scene information. Recent functional magnetic resonance
imaging studies in humans suggest that this domain-specific
organization may be associated with a functional preference
of the anterior-lateral part of the entorhinal cortex
(alErC) for objects and the posterior-medial entorhinal
cortex (pmErC) for scenes. As MTL subregions are
differentially affected by aging and neurodegenerative
diseases, the question was raised whether aging may affect
the 2 pathways differentially. To address this possibility,
we developed a paradigm that allows the investigation of
object memory and scene memory in a mnemonic discrimination
task. A group of young (n = 43) and healthy older subjects
(n = 44) underwent functional magnetic resonance imaging
recordings during this novel task, while they were asked to
discriminate exact repetitions of object and scene stimuli
from novel stimuli that were similar but modified versions
of the original stimuli ('lures'). We used structural
magnetic resonance images to manually segment anatomical
components of the MTL including alErC and pmErC and used
these segmented regions to analyze domain specificity of
functional activity. Across the entire sample, object
processing was associated with activation of the perirhinal
cortex (PrC) and alErC, whereas for scene processing,
activation was more predominant in the parahippocampal
cortex and pmErC. Functional activity related to mnemonic
discrimination of object and scene lures from exact
repetitions was found to overlap between processing pathways
and suggests that while the PrC-alErC pathway was more
involved in object discrimination, both pathways were
involved in the discrimination of similar scenes. Older
adults were behaviorally less accurate than young adults in
discriminating similar lures from exact repetitions, but
this reduction was equivalent in both domains. However, this
was accompanied by significantly reduced domain-specific
activity in PrC in older adults compared to what was
observed in the young. Furthermore, this reduced
domain-specific activity was associated to worse performance
in object mnemonic discrimination in older adults. Taken
together, we show the fine-grained functional organization
of the MTL into domain-specific pathways for objects and
scenes and their mnemonic discrimination and further provide
evidence that aging might affect these pathways in a
differential fashion. Future experiments will elucidate
whether the 2 pathways are differentially affected in early
stages of Alzheimer's disease in relation to amyloid or tau
pathology.},
keywords = {Adult / Aged / Entorhinal Cortex: diagnostic imaging /
Entorhinal Cortex: pathology / Entorhinal Cortex: physiology
/ Female / Healthy Aging: pathology / Healthy Aging:
physiology / Hippocampus: diagnostic imaging / Hippocampus:
pathology / Hippocampus: physiology / Humans / Magnetic
Resonance Imaging / Male / Middle Aged / Neural Pathways:
diagnostic imaging / Neural Pathways: pathology / Neural
Pathways: physiology / Perirhinal Cortex: diagnostic imaging
/ Perirhinal Cortex: pathology / Perirhinal Cortex:
physiology / Temporal Lobe: diagnostic imaging / Temporal
Lobe: pathology / Temporal Lobe: physiology / Young Adult},
cin = {AG Düzel / AG Speck / AG Jessen / Delcode},
ddc = {610},
cid = {I:(DE-2719)5000006 / I:(DE-2719)1340009 /
I:(DE-2719)1011102 / I:(DE-2719)5000034},
pnm = {344 - Clinical and Health Care Research (POF3-344)},
pid = {G:(DE-HGF)POF3-344},
experiment = {EXP:(DE-2719)DELCODE-20140101},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:29454154},
doi = {10.1016/j.neurobiolaging.2017.12.030},
url = {https://pub.dzne.de/record/139871},
}