Lecture 4 - Foundations Of Mind Today End of Depth Next...

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2/13/12 1 slide#1 Foundations Of Mind Today: End of Depth Next Time: Objects slide#2 Unconscious computation : •Takes information from the environment through causal connections with the senses •The computation transforms this information. •The output is a new representation of information not given explicitly by the input. •Some important unconscious computations may be present at birth, innately specified, and not require specific learning. The New view: From Descartes (&others) The idea of unconscious computations ( inferences ) Weakly electric fish • Nocturnal • Can see in the dark using an electric pulse Special thanks to Ben Dirlikov for electric fish information slide#3 Unconscious computation : Distance from blur & contrast Weakly electric fish Max Amplitude Max Slope Distance From Body = 0.5698 Max Slope ^-1.0899 Max Amplitude Special thanks to Ben Dirlikov for electric fish information slide#4 Unconscious computation : Distance from blur & contrast Weakly electric fish Max Amplitude Max Slope Human Special thanks to Ben Dirlikov for electric fish information
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2/13/12 2 slide#5 Unconscious computation : Distance from blur & contrast Weakly electric fish Max Amplitude Max Slope Human -1 -0.5 0 0.5 1 0 2 4 6 8 10 Left To Right Of Image Luminance Contrast Blur Special thanks to Ben Dirlikov for electric fish information Unconscious computation : Distance from blur & contrast Weakly electric fish Human Special thanks to Ben Dirlikov for electric fish information slide#7 Unconscious computation : Distance from blur & contrast Special thanks to Ben Dirlikov for electric fish information Contrast Blur slide#8 Unconscious computation : Distance from blur & contrast Special thanks to Ben Dirlikov for electric fish information Contrast Blur
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2/13/12 3 slide#9 Depth Perception •We experience the visual world as 3-D from information on our 2-D retina. •Mathematically, this is equivalent to forseeing the future by looking at the present. slide#10 Depth Perception How for is apple in dimension 3 (depth)? How rich is Justin in dimension 4 (time)? D E d E = distance between eyes measured in dimension X (in XYZ coordinates) d = angle of eyeball measured by strain of the eye muscle to turn the eye An angle requires two sides In order for there to be an angle of the eye there must be E AND some distance in the Z dimension (depth) that the eye has turned through Question Information Depth Future Baby = a 3 dimensional behaving object Birthday = a single point in the 4th dimension (time) The single point Birthday serves the same job as d for eyesight (it gains purchase on the unknown dimension, time in this case) Baby Birthday J$ slide#11 Depth Perception J$ How for is apple in dimension 3 (depth)? How rich is Justin in dimension 4 (time)?
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