computational modeling of cognitive development · computational modeling of cognitive development...
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Computational modeling of cognitive
development Guest Lecture
Julian Jara-Ettinger Infant & Childhood Cognition
Fall, 2012
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Bottom-Up
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Top-Down: The Design Stance
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Top-Down: The Design Stance
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Top-Down: The Design Stance
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Top-Down: The Design Stance
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Top-Down: The Design Stance
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Top-Down: The Design Stance
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Alarm Clock
Alarm Clock
Alarm Clock
Wax, Nails, etc.
Springs, Gears, etc.
Capacitors, Transistors, etc. Charging capacitors
Spring oscillations
Burning wax
Top-Down
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But no one designed the brain!
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But no one designed the brain!
The brain evolved to do certain computations
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Understand the logic of the computations, not the specific algorithm or implementation.
The Computational Level of Analysis
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Bayesian Models of Cognition
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The Assumptions
Beliefs can be represented as a real number between 0 and 1.
Image: USDA. Public Domain. Image: Arlo MagicMan.Flickr. CC BY-NC
Figure removed due to copyright restrictions. Téglás, Ernő, EdwardVul, et al. "Pure Reasoning in 12-Month-Old Infants as ProbabilisticInference." Science 332, no. 6033 (2011): 1054-9.
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Bayes rule
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Bayes rule
Your belief that a hypothesis is true given the data
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Bayes rule
Your belief that a hypothesis is true given the data is proportional
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Bayes rule
Your belief that a hypothesis is true given the data is proportional to your prior belief in the hypothesis
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Bayes rule
Your belief that a hypothesis is true given the data is proportional to your prior belief in the hypothesis times the likelihood of the hypothesis producing the data.
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Dier?
Animal Mammal Giraffe
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Dier?
Animal 1/3 Mammal 1/3 Giraffe 1/3
P(H) 23
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Animal 1/3 Mammal 1/3 Giraffe 1/3
P(H) Images: Wikipedia. Public Domain.
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Animal 1/3 Mammal 1/3 Giraffe 1/3
Dier!
P(H) Images: Wikipedia. Public Domain.
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Animal 1/3 Mammal 1/3 Giraffe 1/3
Dier!
P(H) P(D|H) Images: Wikipedia. Public Domain.
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Animal (1/3)*(1/4) Mammal 1/3 Giraffe 1/3
P(H) P(D|H)
Dier!
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Animal (1/3)*(1/4) Mammal (1/3)*(1/3) Giraffe 1/3
P(H) P(D|H)
Dier!
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Animal (1/3)*(1/4) Mammal (1/3)*(1/3) Giraffe (1/3)*(1/1)
P(H) P(D|H)
Dier!
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Animal (3/19) Mammal (4/19) Giraffe (12/19)
P(H|D)
Dier!
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Dier!
P(H)
Animal (3/19) Mammal (4/19) Giraffe (12/19)
Dier!
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Dier! Dier!
P(H)
Animal (3/19) Mammal (4/19) Giraffe (12/19)
P(D|H) Images: Wikipedia. Public Domain.
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P(H)
Animal (3/19) * (1/3) Mammal (4/19) Giraffe (12/19)
P(D|H)
Dier! Dier!
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P(H)
Animal (3/19) * (1/3) Mammal (4/19) * (1/2) Giraffe (12/19)
P(D|H)
Dier! Dier!
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P(H)
Animal (3/19) * (1/3) Mammal (4/19) * (1/2) Giraffe (12/19) * (0)
P(D|H)
Dier! Dier!
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P(H|D)
Animal (1/3) Mammal (2/3) Giraffe (0)
Dier! Dier!
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P(H)
Animal (1/3) Mammal (2/3) Giraffe (0)
Dier! Dier! Dier!
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P(H)
Animal (1/3) Mammal (2/3) Giraffe (0)
P(D|H)
Dier! Dier! Dier!
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P(H)
Animal (1/3) * (1/2) Mammal (2/3) Giraffe (0)
P(D|H)
Dier! Dier! Dier!
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Dier! Dier! Dier!
P(H)
Animal (1/3) * (1/2) Mammal (2/3) * (0) Giraffe (0)
P(D|H) Images: Wikipedia. Public Domain.
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P(H|D)
Animal (1) Mammal (0) Giraffe (0)
Dier! Dier! Dier!
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Does this actually look like what our minds do?
• Theory of Mind (Baker et al. 2007, 2009, 2011)
• Intuitive Physics (Battaglia et al. 2011, 2012)
• Object Recognition (Yullie et al. 2006)
• Pragmatic Inference (Bergen et al. 2012)
• Everyday Cognition (Griffiths et al. 2006)
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The most difficult problems
• Objects
• Space
• Time
• Causality
• Number
• Minds
• Morality
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CAN’T CAN
The most difficult problems
Image: John Ryan. Flickr. CC BY-NC-SA.
Image: Zsolt Botykai. Flickr. CC BY-NC-SA.
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MOST POWERFUL INFERENCE MACHINE
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Computational Modeling and the Theory Theory
• Generative theories as hypothesis
Ullman et al. (2010) Courtesy of Elsevier, Inc., http://www.sciencedirect.com. Used with permission.
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Computational Modeling and the Theory Theory
1. Search the space of all possible theories and use bayesian inference to find the theories that best explain the data.
2. Give the model the same data that a baby/infant/toddler observes.
3. Use the best theory to generate new predictions, going beyond the observed data (the problem of induction).
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Does it work?
• We’d like to have computational models of cognitive development and show that infants and children’s learning matched the prediction of the models.
• You have already read through a couple of them… – Pure reasoning in 12-month-old infants as
probabilistic inference (Teglas et al. 2011).
– Infants consider both the sample and the sampling process in inductive generalization (Gweon et al. 2010).
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Model & Predictions&(weak&sampling)
Gweon, Tenenbaum, & Schulz (2010)PNAS
s
Source: Gweon, H., Tenenbaum, J. B., et al. "Infants Consider Both the Sampleand the Sampling Process in Inductive Generalization." Proceedings of theNational Academy of Sciences 107, no. 20 (2010): 9066-9071.
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Model &Predictions&(strong&sampling)
s
Gweon, Tenenbaum, & Schulz
(2010)PNAS Source: Gweon, H., Tenenbaum, J. B., et al. "Infants Consider Both the Sample
and the Sampling Process in Inductive Generalization." Proceedings of theNational Academy of Sciences 107, no. 20 (2010): 9066-9071.
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Source: Gweon, H., Tenenbaum, J. B., et al. "Infants Consider Both the Sample
and the Sampling Process in Inductive Generalization." Proceedings of theNational Academy of Sciences 107, no. 20 (2010): 9066-9071.
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Conclusion
• At a computational level of analysis, we can ask what problems the mind is solving and what an optimal solution might look like.
• We can make specific models of how particular theories might interact with particular patterns of data to affect the kind of learning that occurs.
• We can then investigate the prior beliefs that infants and children have and see if, given those theories, they respond to the data as predicted by the model.
• This can help constrain our search for the algorithms and mechanisms that could implement these computations.
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