Sound clip 1.

The clip presents two sounds with a longish pause in between. In the first presentation you get two pure tones, a low one followed by a higher one (“dah-di”), followed by noise (a buzzing sound like “bzz”). The graph at top shows the sound amplitude as a function of time. (Period 300ms, sampling frequency 10kHz.) What you hear is the expected “dah-di-bzz”. In the next presentation (after a 1000ms pause) the presentation is “dahbzz-di”. The sound amplitude as a function of time is shown in the graph at bottom. What you will hear is more like “dah-di-bzz” though, apparently the temporal order was rearranged in your awareness. For best effect you should listen to the pair various times, carefully comparing the second to the first. Please click to play.