PHGY 209 Final: CNS Cognitive study guide

• School: McGill University
• Department: Physiology
• Course: PHGY 209
• Professor: Ann Wechsler

Document Summary

Conscious experience: thoughts, feelings, dreams, ideas (cannot be measured) Measures activity of neurons located near the scalp in the gray matter of the cortex. Tells us little about underlying computations of the brain but able to tell us about the healthy state of the brain. Measures change in potential (voltage) over time: amplitude: synchronous neural activity, frequency: levels of responsiveness (alert, relaxed, asleep) Reflects mental states: alpha rhythm (relaxed with high closed, brain not working at high levels of cognition): slow frequencies and large amplitude, beta rhythm (alert): fast frequencies, small amplitude. Starts at low amplitude and finishes at stage 4 with high amplitudes, slow frequency. Stage 1-4, 4-1 takes 30-45 minutes (c) rem sleep. Low amplitude, fast frequencies as when you are awake. Young people spend more time in it. Last longer as we progress though the night. Physiological signals of rem: increased eye movements, increased inhibition of skeletal muscles, heart rate increases, respiration increases.