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Chasing the trace
Adam Santoro1, Paul W Frankland2
1Program in Neurosciences and Mental Health, The Hospital for Sick Children, Toronto, ON M5G 1X8, Canada; Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada.
Abstract:
Event memories are stored in hippocampal-cortical networks. In this issue of Neuron, two studies, Cowansage et al. (2014) and Tanaka et al. (2014), tag active cells during memory encoding and optogenetically manipulate the activity of these "engram" cells during subsequent recall to reveal how hippocampal and cortical cell ensembles interact during retrieval.
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Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...

