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Graded persistent activity in entorhinal cortex neurons
KTH, Tidigare Institutioner, Numerisk analys och datalogi, NADA.ORCID-id: 0000-0003-0281-9450
Vise andre og tillknytning
2002 (engelsk)Inngår i: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 420, nr 6912, s. 173-178Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Working memory represents the ability of the brain to hold externally or internally driven information for relatively short periods of time(1,2). Persistent neuronal activity is the elementary process underlying working memory but its cellular basis remains unknown. The most widely accepted hypothesis is that persistent activity is based on synaptic reverberations in recurrent circuits. The entorhinal cortex in the parahippocampal region is crucially involved in the acquisition, consolidation and retrieval of long-term memory traces for which working memory operations are essential(2). Here we show that individual neurons from layer V of the entorhinal cortex-which link the hippocampus to extensive cortical regions(3)-respond to consecutive stimuli with graded changes in firing frequency that remain stable after each stimulus presentation. In addition, the sustained levels of firing frequency can be either increased or decreased in an input-specific manner. This firing behaviour displays robustness to distractors; it is linked to cholinergic muscarinic receptor activation, and relies on activity-dependent changes of a Ca2+-sensitive cationic current. Such an intrinsic neuronal ability to generate graded persistent activity constitutes an elementary mechanism for working memory.

sted, utgiver, år, opplag, sider
2002. Vol. 420, nr 6912, s. 173-178
Emneord [en]
working-memory, parahippocampal region, cortical afferents, hippocampal, rat, connections, responses, channels, network, monkey
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-22041DOI: 10.1038/nature01171ISI: 000179200900045PubMedID: 12432392OAI: oai:DiVA.org:kth-22041DiVA, id: diva2:340739
Merknad
QC 20100525 QC 20111229Tilgjengelig fra: 2010-08-10 Laget: 2010-08-10 Sist oppdatert: 2018-01-12bibliografisk kontrollert

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