PSY 1101 Lecture Notes - Lecture 6: Optic Chiasm, Suprachiasmatic Nucleus, Pineal Gland

• School: University of Ottawa
• Department: Psychology
• Course: PSY 1101
• Professor: Kenneth Campbell

Document Summary

Consists of at least two divisions nrem and rem sleep. Sleep is rhythmic, and the biological clock controls this. Rhythms stated in the lecture outline ---- For human sleep is the circadian rhythm. The onset and offset of sleep is largely biological controlled by the detection of light-dark. Melatonin is released under the influence of the suprachiasmatic nucleus. Melatonin released by pineal gland (under the control of. Mainly released during the night in the absence of light. Administration of melatonin decreases motor activity and induce suprachiasmatic n) Light inhibits the release of melatonin fatigue, lower body temperature. We normally sleep and awaken once every 24 hours. Humans would sleep about 1 hour later every day. How would wake/sleep cycle be affected if the optic nerve is severed prior to chiasm. Processing of stimulus input to cortex must be inhibited. In order to sleep, one cannot be conscious of the external environment. Eeg and brain"s response to stimuli (evoked potentials)