Figure 2. Visual Discrimination Task.

Task used for the two behavioural studies. Four black and white images in a cross shape form a series of static luminance patterns that change with a variable interval. The participants are tasked to use the keyboard to choose the image they consider the brightest and then to keep pressing the chosen key until a new luminance pattern is presented and a new selection is necessary. The grey line represents the feedback provided to the participants and, in this illustration of an ideal behaviour, always represents the selection of the correct cue.