Schyns, P.; Bülthoff, H.; Murphy, G.: Identifying object parts as a function of categorial context. Annual Meeting of the Association for Research in Vision and Ophthalmology (ARVO 1991), Sarasota, FL, USA (1991)

Zelinsky, G.; Sheinberg, D.; Bülthoff, H.: Specifying the cognitive component in center-of-gravity fixations. Annual Meeting of the Association for Research in Vision and Ophthalmology (ARVO 1991), Sarasota, FL, USA (1991)

Mallot, H.; Arndt, P.; Bülthoff, H.: An intensity-based mechanism in human stereopsis. 19. Göttinger Neurobiologentagung, Göttingen, Germany (1991)

Edelman, S.; Bülthoff, H.; Sklar, E.: Task and object learning in visual recognition. Massachusetts Institute of Technology: Artificial Intelligence Laboratory and Center for Biological Information Processing, Whitaker College, Cambridge, MA, USA (1991), 20 pp.

Kersten, D.; Bülthoff, H.: Apparent opacity affects perception of structure from motion. Massachusetts Institute of Technology: Artificial Intelligence Laboratory and Center for Biological Information Processing, Whitaker College, Cambridge, MA, USA (1991), 15 pp.