4 lecture_oct19_CognitiveDevelopment

4 lecture_oct19_CognitiveDevelopment - Cognitive...

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Copyright Thomas R. Shultz 1 Cognitive Development The case of the balance scale cog dev 2 Issues in cognitive development How is knowledge represented? How is knowledge processed? How do these processes change? Stage sequences? cog dev 3 Why the balance scale? Prominent benchmark for modeling in cognitive development Highly replicable phenomena Classic issues on stages & transitions Many models cog dev 4 Balance-scale task Predict which way the scale will tip cog dev 6 6 problem types for rule diagnosis Balance Weight Distance Conflict-weight Conflict-distance Conflict-balance Siegler’s rule- assessment method cog dev 13 Balance-scale stages 1. Weight information 2. Weight information + distance information when weights are equal 3. Both weight & distance information 4. Correct prediction
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Copyright Thomas R. Shultz 2 cog dev 14 Rule diagnosis Stage 1 .33 0 0 Conflict balance 1 .33 0 0 Conflict distance 1 .33 1 1 Conflict weight 1 1 1 0 Distance 1 1 1 1 Weight 1 1 1 1 Balance 4 3 2 1 Problem type cog dev 15 Balance-scale phenomena Progression through four stages 1. Weight information 2. Weight information + distance information when weights are equal 3. Both weight & distance information 4. Correct prediction Torque-difference effect cog dev 16 Torque-difference effect* Torque difference Abs(8-6) = 2 Abs(10-3) = 7 2 x 4 3 x 2 2 x 5 3 x 1 cog dev 17 Previous balance scale models Rule-based models Siegler’s does not develop Langley’s only develops Stage 3 Newell’s fails to reach Stage 4 None show the torque difference effect Connectionist model (McClelland) Never settles in Stage 4 cog dev 18 Example of coding 2
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This note was uploaded on 02/14/2011 for the course PSYC 532 taught by Professor Shultz during the Fall '10 term at McGill.

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4 lecture_oct19_CognitiveDevelopment - Cognitive...

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