Although a wealth of research has examined the effects of virtual interruptions, human-initiated interruptions are common in many work settings. An experiment compared performance on a primary data-entry task during human-initiated (human) versus computer-initiated (virtual) interruptions. Participants completed blocks of trials that featured either an interruption from a computer or an interruption from a human experimenter. The timing of the onset of the interruptions was also varied across trials. Human interruptions resulted in much shorter interruption lags. No significant differences were observed for the number of correct responses on the primary task for human versus virtual interruptions, but interruptions that occurred later in the task sequence resulted in fewer mistakes. The social aspect of human interruptions may have attenuated interruption lags in that condition, and it is possible that virtual interruptions may permit people greater temporal flexibility in managing their engagement with interruptions.
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