The role of spatial location in irrelevant speech revisited: A registered replication of Jones and Macken (1995)

The goal of the present investigation was to perform a registered replication of Jones and Macken’s (1995b) study, which showed that the segregation of a sequence of sounds to distinct locations reduced the disruptive effect on serial recall. Thereby, it postulated an intriguing connection between auditory stream segregation and the cognitive mechanisms underlying the irrelevant speech effect. Specifically, it was found that a sequence of changing utterances was less disruptive in stereophonic presentation allowing each auditory object (letters) to be allocated to a unique location (right ear, left ear, center), compared to when the same sounds were played monophonically. Due to its importance for theoretical accounts of auditory distraction and because the results were somewhat equivocal, it is important to replicate this influential study with enhanced statistical power. The present replication (N=60) confirmed that the disruptive effect of a changing-state sequence ("V-J-X") as compared to a steady-state sequence ("J-J-J") - the changing-state effect - is reduced significantly with stereophonic presentation, suggesting that listeners perceptually grouped the presented sound into three separate steady-state streams, which produce much less interference with seriation compared to the monophonic presentation. However, in contrast to the original study, stereophonic steady-state sequences were found to be slightly more disruptive than monophonic sequences, suggesting that the change in location may also cause some interference on its own. Moreover, there was also a significant steady-state effect, with both steady-state conditions being more disruptive than silence. The results are discussed with regard to interference-by-process and attentional accounts of auditory distraction.