期刊
HIPPOCAMPUS
卷 27, 期 9, 页码 959-970出版社
WILEY
DOI: 10.1002/hipo.22743
关键词
attractor neural network; CA3; hippocampus; memory; place cell; recurrent neural network; teleportation; theta
资金
- EU [720270]
- ERC [268598]
- Foundation Adelis
- Howard Hughes Medical Institute
- [GACR 15-20008S]
- [PROGRES Q39 NPU I LO1503]
- European Research Council (ERC) [268598] Funding Source: European Research Council (ERC)
Hippocampal place cells represent different environments with distinct neural activity patterns. Following an abrupt switch between two familiar configurations of visual cues defining two environments, the hippocampal neural activity pattern switches almost immediately to the corresponding representation. Surprisingly, during a transient period following the switch to the new environment, occasional fast transitions between the two activity patterns (flickering) were observed (Jezek, Henriksen, Treves, Moser, & Moser, ). Here we show that an attractor neural network model of place cells with connections endowed with short-term synaptic plasticity can account for this phenomenon. A memory trace of the recent history of network activity is maintained in the state of the synapses, allowing the network to temporarily reactivate the representation of the previous environment in the absence of the corresponding sensory cues. The model predicts that the number of flickering events depends on the amplitude of the ongoing theta rhythm and the distance between the current position of the animal and its position at the time of cue switching. We test these predictions with new analysis of experimental data. These results suggest a potential role of short-term synaptic plasticity in recruiting the activity of different cell assemblies and in shaping hippocampal activity of behaving animals.
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