week 8: variations in consciousness Flashcards
measures used to detect physiological changes during sleep
EEG
EOG
EMG
EEG measures?
brain waves
EOG measures?
eye movement
EMG measures
muscle tension
how EEG are used
electrodes placed on the scalp to detect and measure patterns of electrical activity emanating from the brain
how eeg work
EEG electrode amplifies electric potentials occurring in many thousands of brain cells
EEG during wakefulness and NREM sleep
alert wakefulness: beta waves just before sleep: alpha waves stage 1: theta waves stage 2: contains sleep spindle and K-complex stage 3: delta waves stage 4
EEG during different sleep stages (including REM sleep)
variations in EEG and EMG in REM sleep
Lack of muscle activity in REM sleep
EEG in REM sleep is similar to EEG while awake
(dreaming stage)
what is rem sleep also known as?
paradoxical sleep
brain activity during REM AND NREM
NREM-decreases from wakefulness
REM-increases in motor and sensory areas, while other areas similar to NREM
HR during REM AND NREM
NREM-slows from wakefulness
REM-increases and varies from NREM
BP during REM AND NREM
NREM-decreases from wakefulness
REM-increases (up to 30%) and varies from NREM
blood flow to brain during REM AND NREM
NREM-does not change from wakefulness in most regions
REM-increases from 50- 200% from NREM, depending on brain region
respiration during REM AND NREM
NREM-decreases from wakefulness
REM-increases and varies from NREM, coughing suppressed
body temperature during REM AND NREM
NREM-is regulated at a lower set point than wakefulness (i.e. shivering will not start until a lower than normal temp is reached)
REM-is not regulated; no shivering or sweating; temperature drifts toward that of the local environment