English: Illustrations of sounds used during Motion Classification. Binaural recording of click and click echoes made in LB's ears in the anechoic chamber, while he held his head stationary and made clicks in the presence of a concave surface located 40 cm and 20° to the left of straight ahead. In the experiment sounds were presented via MR compatible headphones (Sensimetrics, Malden, MA, USA, Model S-14). To illustrate the sounds that participants heard through these headphones during the experiments, sample sounds have been passed through a 10 kHz low-pass filter. NOTE: We advise to use in-ear stereo headphones to listen to sound sample.