In order to construct Embodied Conversational Agents that make gestures just like a human, these gesture must be free to vary in intensity. A definition of intensity is provided, and its parameters (amplitude, speed, repetition, tension) are singled out. On the side of the gesture meaning, some reasons are proposed that can motivate a higher intensity of gestures: the importance of the information to convey, its being loaded with emotion, the need to be understood, and so on. An Artificial Agent who can intensify and de-intensify its gestures is presented.
Hartmann, B., Mancini, M., Poggi, I., Pelachaud, C. (2004). Intensità espressiva. Scopi e segnali dell'intensità nell'espressività del gesto.