After two years at Alma College, Hull moved to Hibbing, Minnesota to work as an apprentice mining engineer. [ 3 ] [ 4 ] However, after two months he was afflicted by polio , which left him paralyzed with one leg, causing him to recover at his parents home for a year and forcing him to reconsider his life path. [ 3 ] [ 4 ] [ 5 ] He considered becoming a minister of Unitarianism , because he found their philosophy focused sermons appealing. [ 3 ] His love of philosophy eventually led to his interest in Psychology, which he studied during his recovery. [ 3 ] [ 5 ] He began his journey by reading William James' book Principles of Psychology. [ 3 ] He also took a particular interest in the works of Watson and Pavlov . [ 6 ] A little after he started reading, his eyes would become weak and his mother would read to him until his eyes became strong enough for him to read on his own.