title: Theta oscillations provide temporal windows for local circuit computation in the entorhinal-hippocampal loop.
abstract: Theta oscillations are believed to play an important role in the coordination of neuronal firing in the entorhinal (EC)-hippocampal system but the underlying mechanisms are not known. We simultaneously recorded from neurons in multiple regions of the EC-hippocampal loop and examined their temporal relationships. Theta-coordinated synchronous spiking of EC neuronal populations predicted the timing of current sinks in target layers in the hippocampus. However, the temporal delays between population activities in successive anatomical stages were longer (typically by a half theta cycle) than expected from axon conduction velocities and passive synaptic integration of feed-forward excitatory inputs. We hypothesize that the temporal windows set by the theta cycles allow for local circuit interactions and thus a considerable degree of computational independence in subdivisions of the EC-hippocampal loop.
authors.affiliation: Center for Molecular and Behavioral Neuroscience, Rutgers, The State University of New Jersey, Newark, NJ 07102, USA.
authors.forename: Kenji
authors.initials: K
authors.lastname: Mizuseki
authors.forename: Anton
authors.initials: A
authors.lastname: Sirota
authors.forename: Eva
authors.initials: E
authors.lastname: Pastalkova
authors.forename: György
authors.initials: G
authors.lastname: Buzsáki
mesh_terms: D000200:Action Potentials / Q000502:physiology*; D000818:Animals; D004558:Electric Stimulation; D018728:Entorhinal Cortex / Q000166:cytology / Q000502:physiology*; D006624:Hippocampus / Q000166:cytology / Q000502:physiology*; D017774:Long-Term Potentiation / Q000502:physiology; D008297:Male; D008959:Models, Neurological; D009068:Movement / Q000502:physiology; D009415:Nerve Net / Q000502:physiology*; D009433:Neural Inhibition; D009434:Neural Pathways / Q000502:physiology; D009474:Neurons / Q000145:classification / Q000502:physiology; D018408:Patch-Clamp Techniques / Q000379:methods; D051381:Rats; D020318:Rats, Long-Evans; D011930:Reaction Time; D009435:Synaptic Transmission; D013826:Theta Rhythm