09-Topics-KnowledgeRepresentation

09-Topics-KnowledgeRepresentation - Introduction to...

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
Introduction to Cognitive Science PSYCH 1102/COGST 1101/LING 1170/ PHIL 1910/CS 1710
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Topics: Knowledge Representation The architecture of thought Lou Ruvo Brain Institute in Las Vegas Frank Gehry, Lead Architect
Background image of page 2
Outline What is knowledge representation? Haven’t we seen this already? Organizing semantic information Concluding with a study tip Organizing event information Really it’s just an excuse to talk about Buffy  the Vampire Slayer
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What is knowledge representation? Haven’t we seen this already?
Background image of page 4
What is knowledge representation? Categorization allowed us to take some set  of perceptual information as identifying an  instance of an object “BEER” “GUINNESS” “SAM ADAMS” “COORS LIGHT”
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What is knowledge representation? As cognitive beings, we do much more than  just categorization We know information  about  objects We know that some objects are related to other  objects Thinking about an object can begin a seemingly  unrelated train of though
Background image of page 6
What is knowledge representation? How we link disparate information in the  mind is the realm of  knowledge  representation I’ll focus on two aspects of this today Semantic information Our knowledge about facts, and ideas Event information Our knowledge about how actions typically unfold But really, they are getting at the same idea
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What is knowledge representation? Sensation Perception Cognition Action Thinking leads to more thinking… 
Background image of page 8
Organizing semantic information Concluding with a study tip
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Organizing semantic information Spreading activation models of memory Information is represented as nodes Nodes that are related to each other are linked by connections When a node is activated it sends activation to all the nodes it is connected to – this is spreading activation This should sound really familiar It’s connectionism, except with a minor tweak to allow us to more easily wrap our minds around it
Background image of page 10
Eats Meat Organizing semantic information Robin See the word “ROBIN” Bird Eats worms Has wings Can Fly Animal
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Spreading activation models of memory Nodes have activation thresholds The node needs to reach a certain level of activation before is sends on activation to other nodes This is similar to the threshold of activation of an action potential in neurons & connectionist models Nodes that have not reached the threshold can still have some activation This is subthreshold activation Subthreshold activation sums, so a node can eventually reach the activation threshold Organizing semantic information
Background image of page 12
Eats Meat Organizing semantic information See the word “BIRD” Robin Bird Eats worms Has wings Can Fly Animal See the word “ROBIN”
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Eats worms Eats Meat Organizing semantic information Canary See the word “CANARY” Robin Bird Has wings Can Fly Animal See the word “ROBIN”
Background image of page 14
Image of page 15
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 70

09-Topics-KnowledgeRepresentation - Introduction to...

This preview shows document pages 1 - 15. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online