Your task is to search for a horizontal or vertical line among many other lines of various orientations. Respond as fast and accurate as possible to the orientation of the target (the horizontal or vertical line), by pressing the following keys:
Horizontal line: [Horizontal]-key
Vertical line: [Vertical]-key
Please, do not make eye-movements when searching for the target. The task is very easy, so try to minimize the number of errors.
In some blocks you get a sound. When you hear this sound, you know that the target (the horizontal or vertical line) is changing color.