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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.