Emotions are an increasingly important factor in Human-Computer Interaction (HCI). Up to the present, emotion recognition in HCI implies the use of explicit or intrusive methods, for example, video cameras or physiological measurements. We are developing and evaluating a method for the measurement of affective states through motor-behavioral parameters from standard input devices (mouse and keyboard).

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How long induced moods last is a critical question for mood research, but has been only poorly addressed to date. In particular, physiological parameters have rarely been included to assess the effectiveness of mood induction procedures. We investigated the persistence of four different moods (positive high-arousal, positive low-arousal, negative high-arousal, and negative low-arousal) induced by film clips during a computer task. We measured subjective affective state, respiration, skin conductance level (SCL), heart rate, and corrugator activity. People who watched the two negative clips reported more negative valence after the task and showed more facial frowning and lower SCL during the task than people who watched the two positive clips. No arousal effects persisted throughout the task. The results suggest that induced changes in the valence dimension of moods are maintained throughout an intervening task and are physiologically best reflected by corrugator activity and SCL, whereas induced changes in the arousal dimension dissipate quickly. The implications of these findings for mood research are discussed.

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The increasing reference to «professional identity» (IP) in the field of teacher training is somewhat confused because of the multiplicity of theoretical models that definie the IP and because this concept is used by professionals themselves. Following this observation, we propose a literature review that aims to overcome the polysemy of the concept and to question its relevance. First, recent work on the shaping of IP teachers are presented and discussed to extract the salient results. Then four theoretical foundations using the concept of IP are exposed and confronted in order to point out the differences and convergences designs. Following these two parts, in conclusion, we question the relevance of the concept and present a definition that tries to overcome misunderstandings.