PSY 1101 Lecture Notes - Lecture 1: Muscle Tone, Evoked Potential, Melatonin

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

Document Summary

Consciousness as a state: sleep & wake states. In human adults, sleep is a circadian rhythm. The onset and offset of sleep is largely biologically controlled by the detection of light-dark. Located immediately superior to optic chiasm (before thalamus) Melatonin released by pineal gland (under the control of suprachiasmatic nucleus) Mainly released during the night (in the absence of light) We normally sleep and awaken once every 24 hours. Humans would sleep about 1 hour later everyday i. e. , we would have a 25 hour day . After 12 days, we would be sleeping at 12:00. The optic nerve is severed prior to chiasm. The optic nerve after the thalamus is severed (thalamo-cortical track?) In order to sleep, one cannot be conscious of the external environment. Processing of stimulus input to cortex must be inhibited. Beta (awake and alert) high frequency; 15 hz +, low amplitude eeg. Delta (deep sleep; coma); low frequency 1-4 hz, high amplitude eeg.