 These factors led Boas to consider pursuing research in psychophysics, which explores the relationship between the psychological and the physical, after completing his doctorate, but he had no training in psychology.Boas did publish six articles on psychophysics during his year of military service (1882–1883), but ultimately he decided to focus on geography, primarily so he could receive sponsorship for his planned Baffin Island expedition.Boas took up geography as a way to explore his growing interest in the relationship between subjective experience and the objective world.