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Speed/accuracy tradeoff Negative relationship between RT and accuracy the faster you go (RT), the worse your performance (accuracy) when you go really.

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Presentation on theme: "Speed/accuracy tradeoff Negative relationship between RT and accuracy the faster you go (RT), the worse your performance (accuracy) when you go really."— Presentation transcript:

1 Speed/accuracy tradeoff Negative relationship between RT and accuracy the faster you go (RT), the worse your performance (accuracy) when you go really fast, performance at worst worst performance = guessing or chance

2 Guessing or chance performance Just by chance, you get the right answer sometimes on a multiple-choice test, with four alternatives per question, one-quarter chance of getting answer right e.g., with 60 m-c questions, guessing gets you 15 correct (1/4)

3 Slowing down on a task Slower you go, the more accurate you get maximum = “ceiling” or asymptote (flattens out)

4 Interpreting SAT Individuals with fast RTs, accuracy may decline due to SAT individuals with slow RTs, accuracy may increase due to SAT

5 Speed/Accuracy Tradeoff Asymptote

6 Verbal report Listening to what people are saying goes on in their heads when doing a task done while a person is doing a task verbal report = what is said (the words) assumption = people already, normally, have thoughts going on while doing a task

7 Verbal reports (cont.) Called “protocol” = transcript of what a person said out loud while doing a task also known as “think aloud” technique a “window” into mental structures, processes, and representations thoughts in the protocol represent the mental processes during the task

8 Thought is the outcome or end-result of a mental process e.g., reading an overhead, think-aloud might produce “click” as your verbal report, which represents the output of having perceived and read the word “click”

9 Measuring RT Typical device is the computer e.g., how long to press a key or how long to speak (vocal response) or how long to make any physical response (manual [hand] responses or foot responses)

10 Measuring RT (cont.) Use a stopwatch (seconds or minutes) compare to computer (milliseconds) or, give a fixed period of time and see how far they get --> see how much is done in that period of time (response-deadline method)

11 Measuring accuracy Typically, done on a computer or keep a record, then go back and compute accuracy easy approach = count number of correct responses (paper-and-pencil)

12 Measuring verbal reports Typically use cassette recorder and microphone to record the verbal report then, transcribe (to paper) and analyze the transcripts


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