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Status: Unchecked ×Keyword: EEG theta rhythm ×Clear all

3 claims from 1 paper

1. Neuroscience › Memory and Neural Mechanisms

   Phase relationship between hippocampal place units and the EEG theta rhythm

   O'Keefe and Recce · Hippocampus · 1993

   The study examined when in the hippocampal theta wave place cells fire in freely moving rats, and found that firing phase shifts systematically as the animal crosses a cell's place field.

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   1. UncheckedIn rats, place cells first fire at a set phase of the theta rhythm on entering their field, then fire progressively earlier in each theta cycle as the rat crosses it.“It was found that firing consistently began at a particular phase as the rat entered the field but then shifted in a systematic way during traversal of the field, moving progressively forward on each theta cycle.”
   2. UncheckedIn rats, the shift in the theta phase at which a place cell fires as the animal crosses its place field ranged from 100° to 355° across different cells.“This precession of the phase ranged from 100° to 355° in different cells.”
   3. UncheckedIn rats, the theta-wave phase at which place cells fire tracked the animal's position closely, and tracked time since entering the place field less well.“The phase was highly correlated with spatial location and less well correlated with temporal aspects of behavior, such as the time after place field entry.”