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CONNECTIONIST MODELLING

CONNECTIONIST MODELLING. CAT. Has fur. purrs. Likes tuna. CONNECTIONIST MODELLING. ANIMALS. Vertebrates. Amphibians Fish Mammals Birds Reptiles. CAT. Has fur. purrs. Likes tuna. Notion of Cognitive Economy. alive sleeps reproduces eats. Animal. Vertebrate. has a spine.

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CONNECTIONIST MODELLING

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  1. CONNECTIONIST MODELLING CAT Has fur purrs Likes tuna

  2. CONNECTIONIST MODELLING ANIMALS Vertebrates Amphibians Fish Mammals Birds Reptiles CAT Has fur purrs Likes tuna

  3. Notion of Cognitive Economy alive sleeps reproduces eats Animal Vertebrate has a spine fly lay eggs feathered Birds Mammals have milk live young have hair Robin Penguin Cat

  4. Evidence FOR • Sentence verification speed: • - quicker to verify across fewer levels of hierarchy (Schwartz & Reisberg, 1991) Evidence AGAINST • Prototypicality effect – a robin is a bird; a penguin is a bird • Familiarity effect – a cat is an animal; a cat is a mammal

  5. alive sleeps reproduces eats Animal Vertebrate has a spine fly lay eggs feathered Birds Mammals have milk live young have hair Robin Penguin Cat Notion of Cognitive Economy

  6. Resolution: The Development of Connectionist Models (Collins & Loftus, 1973) • Abandon hierarchy • Introduce concept of strong and weak links Strong = familiarity/prototypical exemplars Weak = unfamiliar/non-prototypical exemplars

  7. Bruce and Young (1986):Information Processing Model View-Centred Descriptions Expression Analysis Structural Encoding Expression-Independent Descriptions Facial Speech Analysis Face Recognition Units Directed Visual Processing Person-Identity Nodes “Cognitive System” Name Generation

  8. Burton, Bruce & Johnston, (1991): Interactive Activation and Competition Model FRUs ‘tony’ ‘paul’ ‘john’ ‘bill’ SIUs Singer politician British American Dead Alive President PM ‘Beetle’ NAMES Bill Clinton John Lennon Tony Blair Paul McCartney

  9. Burton, Bruce & Johnston, (1991): Interactive Activation and Competition Model + + + + ++++ + +++ FRUs ‘tony’ ‘paul’ ‘john’ ‘bill’ SIUs Singer politician British American Dead Alive President PM ‘Beetle’ NAMES Bill Clinton John Lennon Tony Blair Paul McCartney

  10. Burton, Bruce & Johnston, (1991): Interactive Activation and Competition Model + + + + ++++ + +++ PROSOPAGNOSIA ‘tony’ ‘paul’ ‘john’ ‘bill’ SIUs Singer politician British American Dead Alive President PM ‘Beetle’ NAMES Bill Clinton John Lennon Tony Blair Paul McCartney ANOMIA

  11. SUMMARY: The Value of the Connectionist Approach • It offers a very powerful model of memory • It possesses cognitive economy • It possesses biological plausibility • It can model both intact memory and impaired memory • It can model simple semantic memory and more complex real-world memory • It provides a model of how information is stored and how it is retrieved.

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