HMB310H1 Lecture Notes - Lecture 6: Pyramidal Cell, Neural Oscillation, Alpha Wave
Document Summary
Excitatory and inhibitory synapses: presynaptic action potentials result in either epsp or ipsp, changes in potential reflect ionic currents across the membrane, electroencephalography (eeg) Eeg history and set up: hans berger 1924 first recording of human brain waves (alpha waves) Extended placement systems: more recent derivations allow for a similar scheme when much greater numbers of electrodes are used. 10-5 placement (white) for 128+ electrodes: we can use small (20 electrodes) and big (128 electrodes) The more you have, the better spatial localization. Evoked when you are forcing the neurons to fire in synchrony with external stimulus (auditory or visual) Endogenous more internal (math problems in your head) Neural oscillations: slowest waves (delta) 0. 1-3 hz (0. 3/second, theta (4-7 hz, alpha (8-12 hz, beta (13-29 hz, gamma (30+ hz) What do neural oscillations tell us: we have collections of neurons firing at low to high frequencies and are interacting with each other they are.
