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Signal Detection Theory
Signal Detection Theory is used to help determine how a person might make a decision in an uncertain situation. Experiments typically involve recording when a subject correctly guesses the presence or absence of a stimuli, as well as when a subject falsely chooses one or the other.
Tradeoffs can occur depending on the decision that must be made (depending on if a disease is guessed to be present, then certain expensive or painful treatments must be chosen, or the patient may go home - but treatment will not work if the disease is not present, yet if the disease is ignored, there is risk of greater damage).
Choosing Experiment Variable
Signal Probability - This will specify the probability that a signal will be presented to the subject. Its value must be between 0 and 1 inclusive.
Starting and Rumning the Experiment
To begin the experiment, press the Start trials button. The subject will be shown a "+" focus in the center of the presentation area. There may also be a signal at a random location in the presentation area. The subject then presses the 'f' key or the 'j' key, depending on whether or not they detected the signal. Pressing the SPACE bar begins the next trial.
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