title: Effects of context on a visual 3-D pointing task.
abstract: We examined the effects of egocentric and contextual references on a 3-D exocentric pointing task. Large systematic deviations were found for the slant (angle in the horizontal plane). For most observers, the deviations were smaller when the veridical pointing direction was parallel to a wall. For some observers the size of the deviations was also dependent on whether the veridical pointing direction was frontoparallel or not. For the tilt (angle in the vertical plane), the deviations were smaller and less systematic. Hence, although observers show comparable systematic deviations, the way in which the presence of structure in an environment is used for judging positions of objects is observer-dependent.
authors.affiliation: Helmholtz Institute, Physics of Man, Utrecht University, Princetonplein 5, NL 3584 CC Utrecht, The Netherlands.
authors.forename: Michelle J A
authors.initials: MJ
authors.lastname: Doumen
authors.forename: Astrid M L
authors.initials: AM
authors.lastname: Kappers
authors.forename: Jan J
authors.initials: JJ
authors.lastname: Koenderink
mesh_terms: D000328:Adult; D003867:Depth Perception / Q000502:physiology*; D005260:Female; D005364:Field Dependence-Independence; D006801:Humans; D007600:Judgment / Q000502:physiology; D008297:Male; D010775:Photic Stimulation / Q000379:methods; D011597:Psychomotor Performance / Q000502:physiology*; D011601:Psychophysics; D013028:Space Perception / Q000502:physiology