“…Like in biological systems, for autonomous robots that need to survive and interact in their environments, pleasure (or its functional robot equivalent) can provide signals to assess the positive or negative quality of the perceived stimuli, the behavior being executed, or the interaction with others. In my group, we have developed robot models of different roles of pleasure, where "pleasure" was used, for example, as a signal to learn object affordances in the context of decision making [26], to improve internal homeostasis and adaptation to the environment [27], [63], or to convey a positive message in human-robot interaction contexts [23]. Following the approach adopted in [17], in the above models, pleasure was modeled in terms of release of simulated hormones that affect different aspects of the underlying robot architecture-in the above examples, the learning algorithms, the motivational decision-making model, and the expressive behavioral elements, respectively.…”