During the past decade, a new field of affective computing has emerged and developed into an important research area. In his book "Affective information in human-computer interaction", Dr. Timo Partala explores the potential of utilizing affective signals to enhance the quality of interaction with computers. First, he gives an overview of potential physiology-based computer input signals. Through practical experiments, he also focuses on measuring two sources of affective information: facial expressions and the pupil of the eye. His results suggest that emotions play an important role in human-computer interaction. Pupil size variations and facial expressions can give the computer information about the user’s affective responses, and they could be potential input signals for human-computer interaction in the future. This book is an important read for scholars, practitioners, students, or anyone interested in developing better human-computer interactions.

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