Hippocampal global remapping for different sensory modalities in flying bats

@article{GevaSagiv2016HippocampalGR,
  title={Hippocampal global remapping for different sensory modalities in flying bats},
  author={Maya Geva-Sagiv and Sandro Romani and Liora Las and Nachum Ulanovsky},
  journal={Nature Neuroscience},
  year={2016},
  volume={19},
  pages={952-958}
}
Hippocampal place cells encode the animal's spatial position. However, it is unknown how different long-range sensory systems affect spatial representations. Here we alternated usage of vision and echolocation in Egyptian fruit bats while recording from single neurons in hippocampal areas CA1 and subiculum. Bats flew back and forth along a linear flight track, employing echolocation in darkness or vision in light. Hippocampal representations remapped between vision and echolocation via two… 

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References

SHOWING 1-10 OF 53 REFERENCES

Hippocampal cellular and network activity in freely moving echolocating bats

The first hippocampal recordings from echolocating bats are reported, which showed place cells very similar to those of rodents, and support the hypothesis that theta oscillation in the mammalian hippocampus is involved in sequence learning and hence, theta power should increase with sensory-input rate.

Encoding of Head Direction by Hippocampal Place Cells in Bats

Surprisingly, some hippocampal neurons preserved their head direction tuning even outside the neuron's place field, suggesting that “spontaneous” extra-field spikes are not noise, but in fact carry head-direction information.

Dynamics of hippocampal spatial representation in echolocating bats

The results suggest that spatial representation in mammalian hippocampus can be very rapidly modulated by external sensory and behavioral events.

Cellular networks underlying human spatial navigation

Evidence is presented for a neural code of human spatial navigation based on cells that respond at specific spatial locations and cells thatrespond to views of landmarks that are present primarily in the hippocampus and the parahippocampal region.

Spatial correlates of firing patterns of single cells in the subiculum of the freely moving rat

  • P. SharpC. Green
  • Biology, Psychology
    The Journal of neuroscience : the official journal of the Society for Neuroscience
  • 1994
The results suggest that the subiculum transmits a robust, highly distributed spatial signal to each of its projection areas, and that this signal is transmitted in both a bursting and nonbursting mode.

Representation of Three-Dimensional Space in the Hippocampus of Flying Bats

Recorded single neurons in freely flying bats, using a wireless neural-telemetry system, and studied how hippocampal place cells encode 3D volumetric space during flight suggest that the bat hippocampus represents 3Dvolumed space by a uniform and nearly isotropic rate code.

Multisensory Control of Hippocampal Spatiotemporal Selectivity

Rat hippocampal activity in virtual reality (VR) indicates that distal visual and nonvestibular self-motion cues are sufficient to provide selectivity, but vestibular and other sensory cues present in RW are necessary to fully activate the place-cell population, and suggests cooperative and competitive interactions between sensory cues for control over hippocampal spatiotemporal selectivity and theta rhythm.

Spatial Information Outflow from the Hippocampal Circuit: Distributed Spatial Coding and Phase Precession in the Subiculum

The findings suggest that the subiculum is specialized to compress sparse hippocampal spatial codes into highly informative distributed codes suitable for efficient communication to other brain regions.

Hippocampal remapping and grid realignment in entorhinal cortex

The nature of hippocampal remapping can be predicted by ensemble dynamics in place-selective grid cells in the medial entorhinal cortex, one synapse upstream of the hippocampus, and is shown to be associated with stable grid fields.

Spatial cognition in bats and rats: from sensory acquisition to multiscale maps and navigation

The experimental findings and theoretical models are reviewed that provide insight into the mechanisms that link sensory systems to spatial representations and to large-scale natural navigation.
...