Ringtones are a common distracting sound in modern workspaces. In an earlierexperiment, ringtones increasing in volume (looming) produced greater attentional capture effectin the context of serial short-term memory, than ringtones with sudden onsets that decreased involume (receding). To determine whether this effect occurred merely because the loudest part ofthe looming ringtone coincided with the most sensitive part of the serial short-term memory task,this study repeated the sound conditions of the first experiment, but altered their timing. In thisstudy, the onset of the ringtones were brought forward in time such that the loudest part of thelooming ringtone now coincided with the part of the serial short-term memory task wherein theonset of the looming ringtone occurred in the first experiment. The looming ringtone againproduced more disruption than the receding ringtone, which failed to disrupt performance relativeto the quiet control condition. The presence of a masking sound eliminated the looming ringtoneeffect, as in the previous study. The results here support previous work demonstrating that thelooming sounds give rise to attentional capture and that this reflects an evolutionary adaptation tounconsciously react to approaching sounds/objects.