MATH 190 Lecture Notes - Lecture 11: Frontal Lobe, Occipital Lobe, Thalamus
Document Summary
Electrodes are sticked to the head and measure small voltage fluctuations. It is mostly excitation of the dendrites of the pyramidal neurons in the cerebral cortex. The signal of one neuron is not strong enough, so it are usually the signal of thousands of neurons activated in one time. A consequence is that the amplitude of the eeg signal strongly depends, in part, on how synchronous the activity of the neurons is. Eeg rhytmes vary to what somebody is doing. In general high frequency low-amplitude rhythms are associated with alertness and waking, or the dreaming stages of sleep. Low frequency, high- amplitude rhythms are associated with nondreaming sleep stages, pathological state of coma. Rapid eye movement sleep / rem sleep: eeg looks active, body is immobilized, dreams. An x- times during the time you sleep. The oxygen use is even higher than when you"re doing hard mathematical stuff.
