lec01-4 - Finish: History of Cognitive Psychology Start:...

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Finish: History of Cognitive Psychology Start: Visual Information Processing Psychology 355: Cognitive Psychology Winter Quarter 2009 1/8/2009
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P 355, Miyamoto, Winter '09 2 Outline • Donder’s Method of Subtraction o What is it? o Why is it regarded as important in cognitive psychology? • Helmholtz – Unconscious Inference •2 0 th Century Development of Cognitive Psychology • Basic concepts of neural information processing • Visual information processing & neural feature detectors Next:
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P 355, Miyamoto, Winter '09 3 Early Cognitive Psychology: F. C. Donders (1818-1889) • Mental chronometry: Measuring how long a cognitive process takes • Reaction-time (RT) Experiment (a.k.a. response time experiment) Measures interval between stimulus presentation and person’s response to stimulus • Method of Subtraction: Used to infer how long a mental process takes when the process is not directly observable. o Method of subtraction is an example of a behavioral research method . Next: Simple RT and Choice RT
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P 355, Miyamoto, Winter '09 4 Method of Subtraction Applied to the Comparison Between Simple and Choice Reaction Time • Simple RT task: Participant pushes a button quickly after a light appears • Choice RT task: Participant pushes one button if light is on the right side, and a different button if light is on left side • Donder’s goal: To measure how long it takes a person to decide which button to press in the choice RT task. Next: Diagram Showing Time Course of Simple RT
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P 355, Miyamoto, Winter '09 5 Diagram of Cognitive Processes During Simple RT • Measurement of Simple RT • RT = (Response Completion) – (Stimulus Onset) Time Next: Diagram Showing Time Course of Choice RT
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P 355, Miyamoto, Winter '09 6 • Measurement of Choice RT • RT = (Response Completion) – (Stimulus Onset) Time Diagram of Cognitive Processes During Choice RT Next: Diagram comparing simple and choice RT
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P 355, Miyamoto, Winter '09 7 Method of Subtraction: Compare Simple RT to Choice RT • Method of Subtraction: Choice RT – Simple RT = Duration of Decision Stage (red) Simple RT Choice RT Next: What does Donder’s Method Show About Cognitive Psych? Stimulus Light On Perceive the Light Press Button Perceiving Responding Stimulus Light On Perceive the Light Make Decision Press Correct Button Perceiving Choosing Correct Button Responding
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P 355, Miyamoto, Winter '09 8 Why is Donder’s Method of Subtraction Important for Cognitive Psychology? • It combines a behavioral study with a simple computational model of a
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This note was uploaded on 10/05/2009 for the course PSYCH 355 taught by Professor Miyamoto during the Winter '08 term at University of Washington.

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lec01-4 - Finish: History of Cognitive Psychology Start:...

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