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. 2023 Jan 26;23:100516. doi: 10.1016/j.ynstr.2023.100516

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© 2023 Published by Elsevier Inc.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Inset 2 — A) Example of determining whether the spindles at a particular channel are fast or slow spindles, defined here with ranges of 9–12.5 Hz (slow) and 12.5–16 Hz (fast). The power at various frequencies within each trial where there was a general broadband increase in power within the spindle band are plotted (top). It can be seen that across trials, there was a consistent increase in power within the 12–14Hz frequency range (bottom). Averaging the power across trials reveals a consistent peak at around 13Hz, classifying spindles at this particular channel to be fast spindles. B) The general EEG topographical distribution (in a 64 channel EEG system with 58 cortical recording electrodes) of slow spindles (top) and fast spindles (bottom).