Neurophysiology

Question 1

These waves attenuate on opening the eyes

Answer 1

Alpha waves (8-12 Hz)

Normal: present on closing eyes
Pathologic: coma

Question 2

Present in young children and in deep sleep

Answer 2

Delta waves (up to 3Hz)

Normal: slow wave sleep and babies
Pathologic: subcortical lesions, diffuse lesions, metabolic encephalopathy, hydrocephalus, deep midline lesions

Question 3

Brief bursts of slow waves during stage 2 NREM sleep

Answer 3

K complexes (12-14 Hz)

Normal: K complexes occur during stage 2 sleep
Pathologic: absent in NREM sleep in patients with schizophrenia

Question 4

12-14 Hz waves that occur during stage 2 sleep with K complexes and are absent in NREM sleep in patients with schizophrenia

Answer 4

Sleep spindles