Vertical-Horizontal Illusion

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The vertical–horizontal illusion (Bisection illusion) is the tendency for observers to overestimate the length of a vertical line relative to a horizontal line of the same length.

Within this vertical–horizontal illusion (inverted "T" version), only one variable can be varied: the length of the fixed line. If you vary at least 3 different line lengths within the same task, and repeat each line length at least 2 times, the application will calculate descriptive and inferential statistics for the dependent variables (absolute and relative error).

Related application:   VLT

Language interface: Simple English

Software requirements: any web browser with support for ES6 classes: static. See browser list: here.

The application has been tested on the following web browsers: Firefox, Chrome, Edge, Opera (Internet Explorer 11 is not supported). We mainly develop all our web applications in the Firefox browser. Therefore, generally speaking, the new version of Firefox is always the most secure solution for reliable use of our web applications.

Licence: GNU Lesser General Public License

Version: 1.0

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