The irreducible epistemic atoms underlying the curriculum. 2,888 atoms across 3 types and 2 molecules
Human cognition operates in ultradian cycles of arousal (approximately 80-120 minutes of higher capacity followed by a recovery period) nested within circadian rhythms (24-hour cycles), creating predictable multilevel variation in cognitive capacity, with optimal performance for different cognitive tasks occurring at different phases of these biological cycles.
Attention is capacity-limited such that focus on selected stimuli creates perceptual blindness to unattended information, even when that information is salient and within the sensory field; conscious perception requires directed attention as a necessary precondition.