Expecting a break in time estimation: Attentional time-sharing without concurrent processing

The interference from nontemporal processing on concurrent time estimation is usually attributed to disruption in timing caused by attentional require ments of nontemporal processing. Here, we examined interruption in timing w ithout concurrent nontemporal processing. Empty breaks of various durations , during time-interval production, lengthened produced intervals. Moreover, an effect of break location was observed: Intervals lengthened proportiona lly to prebreak duration. When cued and uncued uninterrupted trials were in troduced, the lengthening was proportional to the duration for which a brea k was expected It was concluded that attentional time-sharing between time estimation and expectation of its interruption contributed to the interfere nce effect in time-estimation research, independently of any concurrent pro cessing requirements during time estimation.