This may help.
https://www.youtube.com/watch?v=BPn3Wzp4NT8
Or this. Read down to Chapter 14.2
http://neuroscience.uth.tmc.edu/s2/chapter14.html
Or this.
https://www.youtube.com/watch?v=FXEzWmhm5z0
Or this.
https://www.youtube.com/watch?v=YGCh1IMIQJw&feature=youtu.be&t=13m36s
John
https://www.youtube.com/watch?v=BPn3Wzp4NT8
Or this. Read down to Chapter 14.2
http://neuroscience.uth.tmc.edu/s2/chapter14.html
Or this.
https://www.youtube.com/watch?v=FXEzWmhm5z0
Or this.
https://www.youtube.com/watch?v=YGCh1IMIQJw&feature=youtu.be&t=13m36s
John
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