Organizational factors in selective attention: The interplay of acoustic distinctiveness and auditory streaming in the irrelevant sound effect

A series of studies further explored the way in which irrelevant sound disr upts the serial recall of visually presented verbal sequences. The hypothes is that distinctiveness (stimulus mismatch) within auditory irrelevant sequ ences is a critical determinant of disruption of serial recall was tested. Experiment 1 showed that the degree of disruption was related to the degree of mismatch between successive stimuli. However, in Experiment 2, changes in 2 attributes of a stimulus produced less disruption than when only 1 was changed, suggesting mismatch alone was not the key factor. These results w ere reconciled with the changing-state hypothesis in Experiment 3 in which change and disruption were monotonically related up to the point at which m ismatch created 2 streams. Object-based theories are able to explain this p attern of results.