Abstract:
:The hippocampus communicates with the neocortex via the entorhinal cortex and is thought to be critically involved in the consolidation of memories. This paper contains in vivo evidence of a projection from the hippocampal area CA1 to the entorhinal cortex. Current theories of memory formation suggest that the backprojections from the hippocampus to the neocortex should undergo some form of plastic change in order that memories become consolidated. Paired-pulse facilitation (PPF) and long-term potentiation (LTP) are forms of short- and long-term plasticity, respectively. We show that the CA1 to entorhinal cortex projection is capable of sustaining PPF over a wide range of stimulus intervals. In addition we demonstrate that following high frequency stimulation of this pathway the evoked response in the entorhinal cortex remains potentiated for at least 30 min. Finally, we demonstrate that PPF changes following LTP depending on the initial ratio of PPF, suggesting that LTP expression on this pathway may contain a presynaptic component. These findings should provide insight into the hippocampal function in memory formation.
journal_name
Neurosci Resjournal_title
Neuroscience researchauthors
Craig S,Commins Sdoi
10.1016/j.neures.2005.06.009subject
Has Abstractpub_date
2005-10-01 00:00:00pages
140-6issue
2eissn
0168-0102issn
1872-8111pii
S0168-0102(05)00166-5journal_volume
53pub_type
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