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e d———o——w———n—l—oa———d——— John MacCallum, Teoma Naccarato. The Impossibility of Control: Real-time Negotiations with the Heart. Proceedings of the Conference on Electronic Visualization in the Arts. London, UK. 2015. c—i——te— We present a practice-based research project, which examines temporal relationships between physiological processes with human movement and mediated environments. Ongoing research will provide a foundation for the creation of performances in which real-time heart rate data from contemporary dancers is used to generate click tracks for live musicians. The complex constructions of time in this project necessitate novel visualization strategies throughout the research, development, creation, and production process, including: time domain display of data with rich and facile interaction using bokeh; visualization of biometric data as a form of biofeedback; and unique representations of time in music notation.