AbstractPrevious research on visual interaction has indicated that Looking1may serve a number of important functions in social interaction. In particular, the apparent relationship between the timing of Looks and the patterning of speech has led to the suggestion that visual communication serves to regulate the flow of conversation and to synchronise transitions from speaker to speaker. This was tested in the present experiment by comparing face‐to‐face dyadic encounters with similar discussions which took place over an audio intercom link which precluded visual communication. Simultaneous speech, which resulted generally from interruptions, occurred more frequently and for longer in total face‐to‐face than in the audio condition, while the length of utterances and the incidence of speech disturbance were both greater in the audio condition. This pattern of findings was quite different from that predicted, and suggests that the role of visual communication is to allow participants to converse spontaneously and interrupt freely by enabling them to send and receive nonverbal signals which maintain the interaction and prevent the breakdown which interruption might otherwise threaten. Suggestions for testing this interpretation further are o