Stimuli.

<p>The stimuli consisted of random dot kinematograms. There were three conditions: 1) egomotion-compatible (EC), with dots expanding, contracting and rotating from the centre of the display; 2) egomotion-incompatible (EI), with dots expanding, contracting and rotating from nine equi-distant points in the display; and 3) random motion (RM), consisting of dots moving in random directions.