automaticity

noun
au·​to·​ma·​tic·​i·​ty | \ˌȯ-tə-mə-ˈti-sə-tē, -ma- \
plural automaticities

Medical Definition of automaticity 

: the capacity of a cell to generate an action potential spontaneously without an external stimulus Atrial tachycardias due to abnormal automaticity or triggered activity are particularly difficult to abolish with antiarrhythmic drugs.— Leonard I. Ganz and Peter L. Friedman, The New England Journal of Medicine, 19 Jan. 1995 All adult cardiac myocytes can respond to electrical stimuli and conduct action potentials, but the working cells of the atria and ventricles generally lack automaticity — Arnold M. Katz, Physiology of the Heart, 5th edition, 2011

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