Electroencephalogram (EEG) recordings reveal the pattern of activity in the brain as waves of different frequencies. The different types of brains waves differ in their frequency with delta the slowest and gamma the fastest. Brain waves from Wikipedia. EEG recording photo by Baburov [CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)], from Wikimedia Commons. Image compilation by Nancy R. Gough, BioSerendipity.
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N. R. Gough, Discovering fast-acting treatments for depression. BioSerendipity (11 January 2019) https://www.bioserendipity.com/discovering-fast-acting-treatments-for-depression/.
N. R. Gough, Neuron and Glia Remodeling Contribute to Male Behavior. BioSerendipity (2 March 2019)
https://www.bioserendipity.com/neuron-and-glia-remodeling-contribute-to-male-behavior/.
N. R. Gough, Giving Mice Artificial Memories to Discover Clues to Depression. BioSerendipity (3 December 2018) https://www.bioserendipity.com/clues-to-depression/.