Psychology 3325 Lecture Notes - Sleep Deprivation, Ryback, Cerebral Cortex
Document Summary
Indus dolphins live in mud and have become blind because vision is not useful very dangerous for it to sleep and does not stop swimming but sleeps at 4-60 second intervals. During stage 4 metabolic activity of brain decreases to about 75% of waking level stage gives brain a chance to rest. People are unreactive to all but intense stimuli during slow-wave sleep and if awakened act groggy and confused as if cerebral cortex has been shut down and hasn"t yet resumed its functioning. Ryback and lewis found no changes in slow-wave or rem sleep on healthy participants who spent 6 weeks resting in bed should expect them to sleep less. Adey, bors, and porter studied sleep of completely immobile quadrpilegics and paraplegics and found only small decrease in slow-wave sleep as compared to others. Bodily exercise has little effect on sleep but mental exercise seems to increase demand for slow-wave sleep.
