PCL102H1 Lecture Notes - Coelenterata, Status Epilepticus, Commissure
Document Summary
Epileptic discharge is seen as a pathological, hyper-synchronized eeg rhythm. Hyper-synchronized as well as a hyper-excitable eeg reading. What causes/is synchrony: what are brain waves (excluding gamma; faster than 30 hz) Note: gamma are excluded because traditional eegs have excluded anything higher than ~30 hz and typically only recorded from 1-30 hz because you wanted to avoid the 60 hz discharge from all the ac current in the walls. Also: the mechanical pens that were used could not follow activity that fast anyway. Spontaneous patterns of electrical activity, usually recorded with gross electrodes. Generated by the synchronous activity of thousands of neurons. They are summated slow potentials (occur in the absence of axonal firing ttx): this means they are epsps and ipsps that you get in the soma and dendrites. Action potentials are too fast to contribute meaningfully to this: so the slow potentials seen in the eeg recordings can occur in the absence of axonal firing (action potentials)
