Jutras et al find a relationship between hippocampal theta and visual exploration via saccadic eye movements. Saccades caused a theta reset that was predictive of subsequent recognition of visual images. Enhanced theta power before stimulus onset was also predictive of recognition.
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A flurry of articles about Picower Institute’s Susumu Tonegawa’s paper implanting false memories in the mouse brain. They identified and tagged a memory engram for one environment, then activated that engram in a different environment while pairing it with shock. Later, the animals showed fear in the first environment as if they were shocked there.
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Kraus et al required rats to run on a treadmill during a working memory task. They dissociated distance traveled vs time spent running by requiring the rats to run for a fixed distance or a fixed amount of time. This revealed “time cells” in the hippocampus that reflect the passage of time.