Calcium activity is a degraded estimate of spikes.

Hart EE, Gardner MPH, Panayi MC, Kahnt T, Schoenbaum G
Curr Biol. 2022 Dec 19;32(24):5364-5373.e4. doi: 10.1016/j.cub.2022.10.037. Epub 2022 Nov 10. PubMed Article

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