Flavio Frohlich
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9/20/2020

Electric Circuits in Neurophysiology

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Learnign cellular neurophysiolgy has the reputation of being the hardest part of the year-long first-year graduate neuroscience course at my university. This is understandable. After all, the generation of action potentials through the interaction of sodium and potassium channels is governed by complex differential equations (Hodgkin-Huxley). Almost ten years ago, when I started out as faculty, I was asked to teach some lectures on the topic. I decided to introduce two new approaches that I have refined over the last decade:

(1) My first idea was that the key concept is the abstraction of biophysics into electric circuit diagrams that are completely foreign to almost all biology students. I had thus decided to formally introduce the students to the basic elements of electric circuits (current source, voltage source, resistors, capacitor) and the "syntax" (Kirchhoff rules) before shifting gears to discussing the passive cell membrane, followed by the action potential itself. I have now produced a series of videos inspired by the lectures I have been teaching. I hope they are of help!
actionpotential_worksheet_flaviofrohlich.pdf
File Size: 384 kb
File Type: pdf
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ipotassium.slx
File Size: 30 kb
File Type: slx
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isodium.slx
File Size: 30 kb
File Type: slx
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hodgkinhuxleypulse.slx
File Size: 35 kb
File Type: slx
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hodgkinhuxleystep.slx
File Size: 36 kb
File Type: slx
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(2) I felt that getting the chance to run simulations will help learners to better grasp the concepts. In fact, I decided that running simulations and plotting the resulting curves by hand will enable an in-depth learning that cannot be achieved by other means. I decided to use Simulink (part of Matlab) for the simulations since it hides the differential equations and yet provides a visualization of how the different elements of a complex set of differential equations come together. Finally, I thought it would be nice to have simulated oscilloscopes to view the resulting traces.  Today, I am sharing with you all these materials in the hope that they are of help to you and your students. Feedback very welcome!​
These materials were the foundation for the chapters on cellular neuroscience (and some of the toolboxes) in my book Network Neuroscience that goes into some more detail (including voltage and current clamp etc). The book covers "network neuroscience" through a wide-angled lens that captures neurophysiology from the level of neurons and synapses all the way to complex large-scale network stuff. Check it out!

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1 Comment
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10/18/2020 04:16:08 am

This is one of the most complicated blogs that I had to read. I am new to biology, and this is far above my knowledge. I understand that it is a bit hard, but I still think that it is important that we do all of this. It is because there are people who need to go through these to help lives. I want to be that kind of person, so thank you for giving me useful information and knowledge.

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