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Lecture 1.docx

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McMaster University
Life Sciences
Ramesh Balasubramaniam

Lecture 1 Contact him through Avenue (he gets too many emails through McMaster email) Dr Ramesh Balasubramaiam [email protected] Ext 21208 Lecture notes are available for sale from Underground Three midterms - 30% each Thursday October 4th, 2012 Tuesday October 30th 2012 Monday November 26th 2012 MC and fill in the blink, short answer questions Final paper - 10% Due last day of school - December 4th Topic and instructions in due course Why do we have a bain? Once we start using our motor system to get around the world we because much more sophisticated We take ambient energy distribution and have a psychological experience that translates it into real time Gives you the feeling like you are part and connected to the world How does the braing take these ambient energy distributions and interpret/use it to interact with the world Perception : energy distribution to what we do We are able to produce intelligence that can beat us at chess but not actually move the piecies E.g. Riding a bicycle is extremely complicated Touching the nose problem How does the brain know how to go about ddoing it Case study - damage to Cerebellum  Was lying in the sun when went unconscious  Trajectory is not normal but mostly has a tough time pointing at the beginning and holding it against his nose  Tremour amplified at nose Scientists can look at tremour and make diagnoses based off of it The degrees of freedom problem  There are infinte number of ways to touch your nose - but you were able to find the simplest way of doing it very easily  How does the brain send motor commands based on your thoughts Bernstein's Problem o Most physica tasks can be done in an infinite nmber of ways o This is possible due to redunant numbers of degrees of freedom Touch the tip of your nose with your finger - how do you control multitple degrees of freedom (1st problem) o How did the inefficient options get eliminated o Problem of selecting the pathis mathematically underdetermined Motor equivalence (2nd problem) o Handwriting still the same even in different circumstances o There is more than one way to solve the degrees of freedom problem Serial order problem (3rd poblem) o The word Tulip o Anticipating u before the t - planning for speech o Motor planning is in sequences (can not be explained by a s
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