These are very unique times for brain research. The aperitif for the course will thus highlight the present “brain-excitements” worldwide. You will then become intimately acquainted with the operational principles of neuronal “life-ware” (synapses, neurons and the networks that they form) and consequently, on how neurons behave as computational microchips and how they plastically and constantly change - a process that underlies learning and memory. Recent heroic attempts to realistically simulate large cortical networks in the computer will be highlighted (e.g., “the Blue Brain Project”) and processes related to perception, cognition and emotions in the brain will be discussed. For dessert we will deliberate on the future of brain research, including the questions of “brain and art”, consciousness and free will. For more information see the course promo below and read “About the course.”
Synapses, Neurons and Brains
proposé par
Hebrew University of Jerusalem
Programme du cours : ce que vous apprendrez dans ce cours
Semaine
1Brain Excitements for the 21st Century
Welcome to synapses, neurons and brains!
8 videos (Total 74 min), 5 lectures
8 vidéos
Welcome Words and Great Thinkers9 min
The Blossoming of the Brain in the World7 min
The Connectomics10 min
Brainbow8 min
Brain Machine Interface BMI16 min
Optogenetics7 min
Simulation of the Brain - Blue Brain Project8 min
5 lectures
About the Course10 min
Course Staff10 min
Course Information10 min
How to Use Discussion Forums10 min
Lecture Slides10 min
Semaine
2The Materialistic Mind - Your Brain's Ingredients
This module's purpose is to acquaint you with "The materialistic mind – your brain’s ingredients". You will become intimately acquainted with the beauty and variety of neurons – the elementary building block/microchips of the brain. We will highlight a big controversy between two great anatomists (Ramon y Cajal and Camillo Golgi) who both received the Nobel Prize in 1906. They asked whether the neuron is a separate “independent” unit (like other cells in other tissues) or whether it is part of a continuum? We will next discuss the neuron as an input-output device and highlight a key property of the nervous system, namely that neurons connect to each other via a wonderful devise called “synapse”.
8 videos (Total 82 min), 1 lecture, 1 quiz
8 vidéos
The Neuron9 min
The Neuron Doctrine9 min
The Neuron as I/O Device Part I8 min
The Axon14 min
The Dendrite8 min
Neuron Type11 min
The Synapse14 min
The Neuron as I/O Device Part II7 min
1 lecture
Lecture Slides10 min
1 exercice pour s'entraîner
Brain Excitements for the 21st Century and The Materialistic Mind28 min
Semaine
3Electrifying Brains –Passive Electrical Signals
In this module we will discuss the "Electrifying brain – passive electrical signals". We will show that neurons are electrical device and learn what enables neurons to become “electrifying”. Here we will describe only the passive (vs. active) electrical properties of neurons. We will show that, at the quiescent state, the difference in electric potential across the cell’s membrane is always negative inside the cell (“the “resting potential”); we next show that the membrane behaves like an electrical (resistance-capacitance) RC circuit and highlight the notion of “membrane time constant” and, consequently, the ability of neurons to summate (in time) successive (synaptic) inputs (“electrical memory”) – a fundamental mechanism utilized by the brain. We will also show that when the synapse is activated, it generates an analog electrical signal (“the post-synaptic potential”, PSP) in the receiving (“post-synaptic”) cell. Most interestingly, there are two types of synapses in the brain – “excitatory” and “inhibitory” – we will discuss how these two opposing signals interact in the receiving ``neuron. This module is more technical than the more descriptive first two lessons; we encourage those of you who are not familiar with basic electricity (resistance, capacitance, Ohms law and Kirchoff’s law) to read about these in the sources links for this week’s lecture.
11 videos (Total 105 min), 1 lecture, 1 quiz
11 vidéos
The Cell as a RC Circuit11 min
The Voltage Equation for the Passive Cell9 min
The Membrane Time Constant14 min
Temporal Summation9 min
The Resting Potential8 min
The Synaptic Potential Part 19 min
The Synaptic Conductance6 min
The Synaptic Battery10 min
The Synaptic Potential Part 28 min
The Voltage Equation for the Synapse and EPSP and IPSP13 min
Summary3 min
1 lecture
Sources for Lesson 310 min
1 exercice pour s'entraîner
Electrifying Brains –Passive Electrical Signals22 min
Semaine
4Electrifying Brains – Active Electrical Spikes
In this module we are covering "Electrifying brains – active electrical spikes". In the previous module we learned that: 1-neurons are electrical devices, 2 - that the membrane behaves as an RC circuit, 3 - that synapses operate by opening a new cross-membrane conductance attached with a battery. In the present module we will proceed to deal with the active electrical aspects of neurons. Synaptic inputs are the elementary (input) sources to neurons and, typically, many (excitatory) of them are required to summate (“temporal summation”) to generate a highly (“all or none”) output signal – the notorious spike (or “action potential”). In our current understanding, sensory, motor, emotional, etc., information is represented by a particular set of neurons that “fire” these spikes. So no movies or music in your brain only spikes representing (coding for) these movies and music. We will focus on the membrane mechanisms underlying the generation of the spike and in particular on the model of Hodgkin & Huxley for the spike which is probably the most fundamental and beautiful model in neuroscience. Hodgkin & Huxley received the Nobel Prize in 1963.
5 videos (Total 80 min), 1 lecture, 1 quiz
5 vidéos
The All or None Spike and the Voltage Clamp11 min
Membrane Currents Underlying the Spike14 min
Modeling the Membrane Currents14 min
The H&H Spike Model24 min
1 lecture
Lecture Slides10 min
1 exercice pour s'entraîner
Electrifying Brains – Active Electrical Spikes26 min
4.8
184 avis83%
a bénéficié d'un avantage concret dans sa carrière grâce à ce cours
14%
a obtenu une augmentation de salaire ou une promotion
Meilleurs avis
par A•Aug 14th 2017
Excellent teaching by Sir. He has created one more enthusiast in the journey of decoding Human Brain. Thank you Sir, getting my basics clear and this will help me to be better Neuro/AI researcher.
par DD•Sep 18th 2015
It is a very interesting and well-done course about neurobiology. Prof. Sedev has many interactive tasks and he tries to explain details as easy as possible. All in all it is understandable.
Enseignant
Idan Segev
ProfessorComputational Neuroscience
À propos de Hebrew University of Jerusalem
Ranked among the top academic and research institutions worldwide, the Hebrew University of Jerusalem is Israel's leading university and premier research institution. Serving 23,000 students from 70 countries, the Hebrew University produces a third of Israel’s civilian research and is ranked 12th worldwide in biotechnology patent filings and commercial development. The Hebrew University was founded in 1918 by visionaries including Albert Einstein, Sigmund Freud, Martin Buber and Chaim Weizmann. It is located on three campuses in Jerusalem and a fourth in Rehovot. Visit the website at http://new.huji.ac.il/en. Join our online learners community at https://www.facebook.com/groups/hujimooc/.
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