Definitionv1
Ultradian rhythm: the approximately 90-minute biological
Ultradian rhythm: the approximately 90-minute biological cycle that alternates between periods of higher neurological arousal (focused, alert, capable of demanding cognitive work) and periods of lower arousal (diffuse, restless, better suited for recovery or routine tasks) operating within circadian rhythms
Why This Is a Definition
This definition establishes the precise semantic boundary of 'ultradian rhythm' by categorizing it as a biological cycle within circadian rhythms, specifying its genus (biological cycle), differentia (90-minute periodicity with alternating arousal states), and distinguishing it from other time-related concepts like circadian rhythms. It's precise enough to distinguish from related terms like Pomodoro technique.