Coordinated memory replay in the visual cortex and hippocampus during sleep

@article{Ji2007CoordinatedMR,
  title={Coordinated memory replay in the visual cortex and hippocampus during sleep},
  author={Daoyun Ji and Matthew A. Wilson},
  journal={Nature Neuroscience},
  year={2007},
  volume={10},
  pages={100-107}
}
Sleep replay of awake experience in the cortex and hippocampus has been proposed to be involved in memory consolidation. [] Key Method Here we studied multicell spiking patterns in both the visual cortex and hippocampus during slow-wave sleep in rats. We found that spiking patterns not only in the cortex but also in the hippocampus were organized into frames, defined as periods of stepwise increase in neuronal population activity. The multicell firing sequences evoked by awake experience were replayed during…
Awake replay of remote experiences in the hippocampus
TLDR
It is shown that stored representations are reactivated during both waking and sleep replay, and that the hippocampus consistently replays past experiences during brief pauses in waking behavior, suggesting a role for waking replay in memory consolidation and retrieval.
Biasing the content of hippocampal replay during sleep
TLDR
Rats were trained on an auditory-spatial association task while recording from neuronal ensembles in the hippocampus and it was found that, during sleep, a task-related auditory cue biased reactivation events toward replaying the spatial memory associated with that cue.
Querying hippocampal replay with subcortical inputs
TLDR
It is argued that hippocampal activity is under the influence of primary spatial signals, which originate from subcortical structures and set the stage for memory replay, and reciprocal interaction between the HD network and the hippocampus may be essential in providing meaning to hippocampusal activity.
Memory Replay in the Hippocampus
TLDR
Since memory replay during SWRs has the capacity to recreate patterns of activity associated with past experience in hippocampal–neocortical circuits, it is well suited to support memory retrieval.
Fast-Forward Playback of Recent Memory Sequences in Prefrontal Cortex During Sleep
TLDR
It is found that, during sleep, reactivation of spatiotemporal patterns was coherent across the network and compressed in time by a factor of 6 to 7.
Mechanisms of hippocampal sequence replay
TLDR
This work constructs a model of CA3 area in which stochastic intrinsic activation of pyramidal cells originates a massive cell activation that results in a strong excitatory input to area CA1, and characterize the mechanisms underlying sequence selection and reactivation within a sharp-wave ripple event.
Hippocampal memory consolidation during sleep: a comparison of mammals and birds
TLDR
Avian sleep does not appear to be involved in transferring hippocampal memories to other brain regions, and the slow‐oscillation, the defining feature of mammalian and avian SWS, may serve a more general function independent of that related to coordinating the transfer of information from the hippocampus to the PFC in mammals.
A cortical–hippocampal–cortical loop of information processing during memory consolidation
TLDR
It is shown that during sleep there is a rapid cortical–hippocampal–cortical loop of information flow around the times of SWRs, which suggests that activation of specific cortical representations during sleep influences the identity of the memories that are consolidated into long-term stores.
Novel Experience Induces Persistent Sleep-Dependent Plasticity in the Cortex but not in the Hippocampus
TLDR
The results indicate that hippocampo-cortical activation during waking is followed by multiple waves of cortical plasticity as full sleep cycles recur, and the absence of equivalent changes in the hippocampus may explain its mnemonic disengagement over time.
Hippocampal replay and cortical slow oscillations: a computational study
TLDR
A computational model of ripple generation is designed that emphasizes the role of axo-axonic cells in selecting which pyramidal cells are participating in ripple activity, hence what sequence is replayed during a given ripple.
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 62 REFERENCES
Reactivation of hippocampal ensemble memories during sleep.
TLDR
Recordings from large ensembles of hippocampal "place cells" in three rats showed that cells that fired together when the animal occupied particular locations in the environment exhibited an increased tendency to fire together during subsequent sleep, in comparison to sleep episodes preceding the behavioral tasks.
Replay of Neuronal Firing Sequences in Rat Hippocampus During Sleep Following Spatial Experience
TLDR
The correlated activity of rat hippocampal pyramidal cells during sleep reflects the activity of those cells during earlier spatial exploration and this memory for temporal order of neuronal firing could be produced by an interaction between the temporal integration properties of long-term potentiation and the phase shifting of spike activity with respect to the hippocampal theta rhythm.
Memory of Sequential Experience in the Hippocampus during Slow Wave Sleep
Communication between neocortex and hippocampus during sleep in rodents
TLDR
A robust correlation of neuronal discharges between the somatosensory cortex and hippocampus on both slow and fine time scales in the mouse and rat is shown, suggesting that oscillation-mediated temporal links coordinate specific information transfer between neocortical and hippocampal cell assemblies.
Memory reprocessing in corticocortical and hippocampocortical neuronal ensembles.
TLDR
Hippocampal cells that fire together during behaviour exhibit enhanced activity correlations during subsequent sleep, with some preservation of temporal order information, and traces of recent experience are re-expressed in both hippocampal and neocortical circuits during sleep.
Off-line replay maintains declarative memories in a model of hippocampal-neocortical interactions
TLDR
It is found that, in the absence of regular hippocampal reactivation, even supposedly consolidated episodic memories are fragile in the face of cortical semantic plasticity.
Reactivation of Hippocampal Cell Assemblies: Effects of Behavioral State, Experience, and EEG Dynamics
TLDR
Pattern reinstatement was strongest during sharp wave–ripple oscillations, suggesting that these events may reflect system convergence onto attractor states corresponding to previous experiences, and do not necessarily reflect persistence of an active memory.
Long-Lasting Novelty-Induced Neuronal Reverberation during Slow-Wave Sleep in Multiple Forebrain Areas
TLDR
The results indicate that persistent experience-dependent neuronal reverberation is a general property of multiple forebrain structures, and does not consist of an exact replay of previous activity, but instead it defines a mild and consistent bias towards salient neural ensemble firing patterns.
...
1
2
3
4
5
...