24 subjects were required to respond to verbal questions and sometimes given new questions while still answering a previous one. When occasional pairs of questions caused simultaneous speaking and listening both the interrupted response and the response to the interrupting question were significantly impaired, but the extent of the impairment was not very serious. Overlapping questions resulted in more serious impairment. It is supposed there is some interference between speaking and listening as such, in addition to the perceptual difficulty of handling a rapid series of messages. (PsycINFO Database Record (c) 2006 APA, all rights reserved)