09_Perception_Action3_Action_Presentation

09_Perception_Action3_Action_Presentation - INTRODUCTION TO...

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Click to edit Master subtitle style Introduction to cognitive science Psych 102/COGST 101/LING 170/PHIL 191/ COMS 101
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The complexity of vision Perception for Action – An overview Robotics Biology of Movement & Motor Programs Perception for Action
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The complexity of Vision
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The Complexity of Vision Typical framework for vision l Out in the world is an array of objects l We reconstruct a veridical three dimensional representation of the world that is available to “consciousness” l We reason about our model and then act based on this reasoning But is this really the best approach? l Fits with our “conscious” experience of the world l Does it fit with the neuroscience of vision?
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Vision
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Perception for Action – An overview
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Perception for Action – An overview An alternative approach Perception for action The goal of vision (& all perception) is to act in the world in a useful way Avoid danger Find food Find a mate Most perception is being used to drive movement At least in evolutionary terms
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Perception for Action – An overview In these terms what does a perceptual system need to do? l Do we need a veridical 3-D representation of the world? l Do we always need object recognition? l Do we always need “veridical” representations of sound and taste and smell?
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Perception for Action – An overview GOFAI (and most connectionism) l Modelling perception l Modelling mental representations of information about the environment l No real modelling of action
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Robotics
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Robotics Key features of autonomous robots l Sensors A way to perceive the world l Effectors A way to manipulate the world l maybe
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Battlebots Not a robot
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Roomba Really simple robot Right Motor Left Motor Collisi on Sensor Compa rator + +
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Roomba Key features of autonomous robots l Sensors A way to perceive the world l Effectors A way to manipulate the world l Direct link from sensor to effector Back up a bit, turn 90 degrees and repeat
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Photovore How a photovore works Right Motor Left Motor Left Light Sensor Right Light Sensor Compa rator 1 Compa rator 2 + - + -
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Photovore How a photophobe works Right Motor Left Motor Left Light Sensor Right Light Sensor Compa rator 1 Compa rator 2 - + - +
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Photovore Key features of autonomous robots l Sensors A way to perceive the world l Effectors A way to manipulate the world l Direct link from sensor to effector Perception directly manipulate action No cognition in between
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Photovore “But people are more complex” l we can choose to do or not do stuff l we have multiple possible actions
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Photovore A more complex photovore/photophobe l Typically hiding in the dark is good It protects you from other animals etc l But there’s no food there l A more complex machine will hide unless it needs food and then it will go hunting till it’s satisfied and then hide again
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Photovore A decision making photo-bot Photop hobe Photov ore Solar cell Compa rator 3 + -
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09_Perception_Action3_Action_Presentation - INTRODUCTION TO...

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