The effects of affective interventions in human-computer interaction

The present study investigated the psychophysiological effects of positive and negative affective interventions in human-computer interaction during and after the interventions. Eighteen subjects were exposed to pre-programmed mouse delays in an interactive problem-solving task. Following the mouse delays three types of conditions were used: positive or negative interventions given via speech synthesizer, and no intervention. Facial electromyographic responses were recorded from the zygomaticus major and corrugator supercilii muscle sites. These muscles control smiling and frowning, respectively. Smiling activity was significantly higher during the positive than the other conditions. It was also significantly higher after the positive interventions than the no intervention condition. The frowning activity attenuated significantly more after the positive interventions than the no intervention condition. Following the positive interventions the users' problem solving performance was significantly better than after no intervention. In all, the results suggest that both types of affective intervention had beneficial effects over ignoring the user. The results suggest further that positive intervention may be especially useful. (C) 2004 Elsevier B.V. All rights reserved.