Breaking the silence: Exploring the influence of auditory singularity on visual search

The pip-and-pop effect describes the phenomenon of auditory pure-tone stimuli (pip) causing simultaneously visual target to pop out. This study utilised a dynamic visual search paradigm and conducted two eye movement experiments (Experiment 1: set size = 24 items; Experiment 2: set size = 48 items) to explore the influence of auditory singularity on the Pip-and-Pop effect through single-sound condition (singularity) and multiple-sound condition (non-singularity). In Experiment 1, there were no significant differences between the no-sound, single-sound, and multiple-sound conditions in terms of reaction time, accuracy, or fixation number. In Experiment 2, compared with the no-sound condition, both the single-sound and multiple-sound conditions significantly reduced the Search time (RTs), accuracy, and fixation numbers when the target was present. Both Experiments 1 and 2 revealed that the fixation duration under the single-sound condition was significantly longer than that under the no-sound condition. These findings suggest that the singularity of auditory stimuli is not a necessary condition for the pip-and-pop effect. Audiovisual interaction is more likely to be a prerequisite for the occurrence of the pip-and-pop effect.