Thomas E. Horton Horton, T. E., & Amant, R. S. (2017). A Partial Contour Similarity-Based Approach to Visual Affordances in Habile Agents. IEEE TRANSACTIONS ON COGNITIVE AND DEVELOPMENTAL SYSTEMS, 9(3), 269–280. https://doi.org/10.1109/tcds.2017.2702599 St Amant, R., & Horton, T. E. (2008). Revisiting the definition of animal tool use. Animal Behaviour, 75(4), 1199–1208. https://doi.org/10.1016/j.anbehav.2007.09.028