Poggendorff Illusion

The purpose of this experiment is to measure how the magnitude of the Poggendorff illusion is affected by changes in the separation of the vertical line components and changes in the length of the diagonal line components. Twenty-four randomly ordered trials are used to obtain 4 replicate measures under the 6 experimental conditions shown below. On each trial, users drag the upper right diagonal to a position that appears collinear with a lower right diagonal.  The dependent measure is the degree of misalignment of these diagonal line segments in pixels.

Begin the Poggendorff Illusion Experiment                  Download Authorware Source Files

Download Poggendorff Data Files

Last revised:June 03, 2003 11:46:53 AM
Copyright© 1995 The University of Mississippi. All rights reserved.
Questions about this page?PsychExps