A neural substrate in the human hippocampus for linking successive events.

Abstract:

:Memory formation requires the placement of experienced events in the same order in which they appeared. A large body of evidence from human studies indicates that structures in the medial temporal lobe are critically involved in forming and maintaining such memories, and complementing evidence from lesion and electrophysiological work in animals support these findings. However, it remains unclear how single cells and networks of cells can signal this temporal relationship between events. Here we used recordings from single cells in the human brain obtained while subjects viewed repeated presentations of cinematic episodes. We found that neuronal activity in successive time segments became gradually correlated, and, as a result, activity in a given time window became a faithful predictor of the activity to follow. This correlation emerged rapidly, within two to three presentations of an episode and exceeded both context-independent and pure stimulus-driven correlations. The correlation was specific for hippocampal neurons, did not occur in the amygdala and anterior cingulate cortex, and was found for single cells, cell pairs, and triplets of cells, supporting the notion that cell assemblies code for the temporal relationships between sensory events. Importantly, this neuronal measure of temporal binding successfully predicted subjects' ability to recall and verbally report the viewed episodes later. Our findings suggest a neuronal substrate for the formation of memory of the temporal order of events.

authors

Paz R,Gelbard-Sagiv H,Mukamel R,Harel M,Malach R,Fried I

doi

10.1073/pnas.0910834107

subject

Has Abstract

pub_date

2010-03-30 00:00:00

pages

6046-51

issue

13

eissn

0027-8424

issn

1091-6490

pii

0910834107

journal_volume

107

pub_type

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