Levels of Explanation

Question 1

What are the levels of abstraction?

Answer 1

What are the goals of the system? What are its inputs and outputs?

What representation does the system use? How are these representations transformed?

How are these operations physicals?

Question 2

What is the first level of Marr’s Three Levels?

Answer 2

Computational theory: What is the goal of this computation? What information of the world is it using?

Question 3

What is the second level of Marr’s Three Levels?

Answer 3

Representation and Algorithm. How can this computational theory be implemented? Specifically what is the representation for the output and input and what is the algorithm for transformation.

Question 4

What is the third level of Marr’s Three Levels?

Answer 4

Physically how does this work. We need to implement using the laws of physics for this process.

Question 5

What is the first of Pylyshyn’s Tri-Level Hypothesis?

Answer 5

Biological/Physical -> Implementational
How do we take these parts from the real world

Question 6

What is the second of Plylshyn’s Tri-Level Hypothesis

Answer 6

Symbolic/Syntactic -> Algorithmic
What are the symbols representations that these systems are keeping track of

Question 7

What is the third of Pylyshyn’s Tri-Level Hypothesis?

Answer 7

Knowledge / Semantic -> Computational How does this- what we are doing respond in the real world

Question 8

What are the differences between Marr’s levels and Pylyshyn’s Tri-Level Hypothesis?

Answer 8

Computation” is about intrinsic properties of the system being described. “Semantics” is about how the system represents external properties in the world