Lecture 08 - Neuroscience - Part 2

Lecture 08 - Neuroscience - Part 2 - INTRODUCTION TO...

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INTRODUCTION TO COGNITIVE SCIENCE PSYCH 1102/COGST 1101/LING 1170/ PHIL 1910/CS 1710
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Neuroscience Doing computation with neurons                Psychology                Neuroscience Linguistics Science Philosophy                Mind?
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Outline Networks – Pt 1 Those things can think? Photoreceptors A thousand points of light (or 100 million) Center Surround Cells Turning off is as important as turning on Simple Cells All that for a dot! What else can you do? Complex Cells Lines, lines everywhere Networks – Pt 2 Representing complex information with simple units
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Networks – Pt 1 Those things can think?
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Networks – Pt 1 Individual neurons are “dumb” Binary activation units Only aware of very local environment Brains are smart But they’re just a bunch of neurons!
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Networks – Pt 1 So, how do we put a bunch of unthinking  components together to get a thinking  system? The  connections  matter The complex interaction of neurons in  networks  is where we get the thinking We’ll use some networks in vision as an  example of this process
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Photoreceptors A thousand points of light (or 100 million)
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Photoreceptors Vision begins in the  retina The light sensitive surface at  the back of the eye Built of  photoreceptors Individual cells that are  excited by the presence of  light
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Photoreceptors Photoreceptors are  packed into a grid About 120 million rods  (B/W vision) About 6 million cones  (Color Vision) unaware of their  neighbors Respond the same,  regardless of what their  neighbors are up to
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Photoreceptors Photoreceptor is excited Fires more APs Photoreceptor is excited Fires more APs Other receptors  also   excited But none has knowledge  of its neighbors
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Lecture 08 - Neuroscience - Part 2 - INTRODUCTION TO...

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