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Instructional Software for
Statistics & Experimental Psychology

RippleSoft Software

Experimental Psychology Tasks

Signal Detection Theory, Classical Psychophysics, Magnitude Estimation

Signal Detection Theory

SDT Simulation: An explanation of the rationale of signal detection theory illustrated with a judgment task simulation.

SDT Model: The user can interact with the "Noise Only" and "Noise + Signal" distributions and the "Response Criterion" to see the changes occurring in the proportions of false alarms and correct dections. One screen shows changes in the isosensitivity function (aka "ROC curve"). Another screen provides a calculation tool for determining the values of sensitivity and response bias from either frequencies or proportions.

SDT Plot Tool: An interactive tool for plotting the results of SDT tasks.

SDT Square Judging Task: Users are asked to determine whether a stimulus is a "Square" or a "Rectangle." The signal the user is trying to detect is whether the stimulus is longer in one dimension than the other: Squares are "Noise Only"; rectangles are "Noise + Signal.This laboratory task requires several calibration tasks be completed. First, the student has to determine the Aspect Ratio of the display so the program can create a stimulus that will be displayed as a square. Secondly, the student must determine their own susceptibility to the Horizontal-Vertical illusion so the program can display a stimulus as a square the student will judge to be a square. Thirdly, the student must complete pilot tasks to determine how sensitive they are to the differences in length of height and width so moderately difficult stimuli can be presented (stimuli that will not be allways judged correctly).

Classical Psychophysical Methds Method of Adjustment: Muller-Lyer Illusion

Method of Constant Stimulus Differences: Square Judging

Magnitude Estimation

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Page Modified on 12/20/07