Earlier research investigating persuasive technology-technology designed to influence human behavior or attitude-indicates that persuasive technology can stimulate energy-efficient behavior. However, most applications of persuasive technology need people's focal attention to be successful, and people may often not have these cognitive resources available. The current research investigates a form of persuasive technology that is less obvious and easier to process: ambient lighting as persuasive technology. In an experimental study, participants could conserve energy while setting temperatures on a central heating panel and receive feedback about their energy consumption in each task. We tested the effect of feedback through a lamp that gradually changed color dependent on energy consumption and compared these effects to more widely used factual feedback. Half of the participants received lighting feedback, and half of the participants received numerical feedback. To investigate whether ambient feedback is easier to process than numerical feedback, half of the participants performed a cognitive load task in addition to the focal task. Results indicated that feedback through lighting has stronger persuasive effects than numerical feedback. Furthermore, ambient lighting feedback seemed easier to process than numerical feedback because cognitive load interfered with processing numerical feedback, but not with processing lighting feedback. Implications for theory and design of energy consumption feedback systems, persuasive lighting, and (ambient) persuasive technology are discussed.
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