title: Perception of fragmented images of three-dimensional objects as the observation angle changes.
abstract: Recognition thresholds for incomplete two-dimensional images of three-dimensional objects were measured as the observation angle was changed. A new experimental psychophysical method was developed and programmed for this purpose, this being a modification of the Gollin test, which measures perception thresholds of incomplete outline images. After training to a stimulus alphabet, observers' responses were found to be invariant to changes in the observation angles of three-dimensional objects from 15 degrees to 60 degrees. It is suggested that possible algorithms for the formation of models of three-dimensional images in the human visual system do not operate on the basis of simple section, but involve invariance mechanisms.
authors.affiliation: I. P. Pavlov Institute of Physiology, Russian Academy of Sciences, 6 Makarov Bank, 199034, St. Petersburg, Russia. niv@pavlov.infran.ru
authors.forename: V N
authors.initials: VN
authors.lastname: Chikhman
authors.forename: Y E
authors.initials: YE
authors.lastname: Shelepin
authors.forename: N
authors.initials: N
authors.lastname: Foreman
authors.forename: P
authors.initials: P
authors.lastname: Passmore
authors.forename: P
authors.initials: P
authors.lastname: Pacemore
mesh_terms: D006801:Humans; D021621:Imaging, Three-Dimensional; D010364:Pattern Recognition, Visual / Q000502:physiology; D014796:Visual Perception / Q000502:physiology*
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