State changes and N2 transients

Criteria & assessment

• Present requires >=2 background types, each sustained >=60 s.
• Stimulation should transition less-alert to more-alert/stimulated; spontaneous transitions qualify; the more-alert state is primary.
• State changes virtually always imply reactivity; reactivity need not imply a state change when it lasts <60 s.
• Categories: present with normal N2 transients; present with abnormal N2 transients; present without N2 transients; absent.
• Describe K-complexes and spindles separately: present-normal, present-abnormal with abnormality, or absent.