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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Neurobiol+Learn+Mem
2016 ; 129
(ä): 107-12
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Mnemonic discrimination relates to perforant path integrity: An ultra-high
resolution diffusion tensor imaging study
#MMPMID26149893
Bennett IJ
; Stark CE
Neurobiol Learn Mem
2016[Mar]; 129
(ä): 107-12
PMID26149893
show ga
Pattern separation describes the orthogonalization of similar inputs into unique,
non-overlapping representations. This computational process is thought to serve
memory by reducing interference and to be mediated by the dentate gyrus of the
hippocampus. Using ultra-high in-plane resolution diffusion tensor imaging
(hrDTI) in older adults, we previously demonstrated that integrity of the
perforant path, which provides input to the dentate gyrus from entorhinal cortex,
was associated with mnemonic discrimination, a behavioral outcome designed to
load on pattern separation. The current hrDTI study assessed the specificity of
this perforant path integrity-mnemonic discrimination relationship relative to
other cognitive constructs (identified using a factor analysis) and white matter
tracts (hippocampal cingulum, fornix, corpus callosum) in 112 healthy adults
(20-87 years). Results revealed age-related declines in integrity of the
perforant path and other medial temporal lobe (MTL) tracts (hippocampal cingulum,
fornix). Controlling for global effects of brain aging, perforant path integrity
related only to the factor that captured mnemonic discrimination performance.
Comparable integrity-mnemonic discrimination relationships were also observed for
the hippocampal cingulum and fornix. Thus, whereas perforant path integrity
specifically relates to mnemonic discrimination, mnemonic discrimination may be
mediated by a broader MTL network.