LEC2b_06_Method

LEC2b_06_Method - Method:ReactionTime(RT) Example:

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Method: Reaction Time (RT) Example: Simple detection  ($, ruler, glasses) Liberal vs. conservative response criterion (speed/accuracy trade-off) Secondary task Additive method (e.g., visual degradation)
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Subtractive Method Task 1: simple detection task press key when light blue appears on the screen Task 2: discrimination task Respond to the blue light but not to the yellow light The two tasks have: Same stimulus (blue light) Same response (key press) Only one thing different (?): discrimination vs. detection RT discrimination - RT detection = the mental operation of having to discriminate two stimuli
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Subtractive Method Very simple and powerful method Developed by Donders in the 1800’s Used even today (e.g., fMRI studies) But it has its problems What constitute the elemental mental operation It is not very flexible
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Additive Factors Method Developed by Sternberg (1969) Example: memory task (as already described) Numbers were displayed 3 9 5 4 Delay A probe 4 ‘yes’ Number of items in each trial vary from 1 to 6 items
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3 7 9 2
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9
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This note was uploaded on 10/14/2011 for the course PSYCH 100 taught by Professor X during the Spring '11 term at Fairfield.

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LEC2b_06_Method - Method:ReactionTime(RT) Example:

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