Sound and the absence of sound were used during the adaptation period of a conventional experiment on autokinetic effect conducted in anechoic and reverberation rooms of equal size. Only the room condition led to significantly different results: more visual autokinesis in the reverberation room. The data are discussed in light of the results of an earlier, similar experiment where the reverberation room yielded less visual autokinesis. It is suggested that affect rather than sound influenced the autokinetic phenomenon.