Wiktionary
n. 1 The ability to do things without occupying the mind with the low level details required. 2 (context medical English) The ability of the heart muscles to contract independently of each other when separated or in unison when reattached in whole or in groups
Wikipedia
Automaticity is the ability to do things without occupying the mind with the low-level details required, allowing it to become an automatic response pattern or habit. It is usually the result of learning, repetition, and practice.
Examples of automaticity are common activities such as walking, speaking, bicycle-riding, assembly-line work, and driving a car (the last of these sometimes being termed " highway hypnosis"). After an activity is sufficiently practiced, it is possible to focus the mind on other activities or thoughts while undertaking an automatized activity (for example, holding a conversation or planning a speech while driving a car).
Usage examples of "automaticity".
He'd had no one to instruct him, even unwittingly: Tarimenloku and his officers operated by long-conditioned automaticities, and relied heavily on the ship's computer.
Similarly, behind them, in the halls, lights went on and off as they left them behind, with a soft automaticity.
Similarly, behind them, in the halls, lights went on and off as they left them behind, with a soft automaticity.