title: The influence of secondary depth cues on the understanding by Nigerian schoolboys of spatial relationships in pictures.
abstract: The ability of 105 Nigerian schoolboys to interpret pictures three-dimensionally was studied as a function of changing the number of depth cues on moving from monochrome photographs incorporating the effects of shadow, through fully cued line drawings, to line drawings containing only elevation cues. The experiment also investigated the effects of different amounts of previous formal training in technical drawing on performance in these tasks. The results showed a significant increase in performance as the number of depth cues increased above that contained in the minimum cued line drawings. However, the difference between the effects of fully cued line drawings and the photographs was not significant. Neither the main nor interaction effects relating to levels of formal training in technical drawing were significant.
mesh_terms: D000293:Adolescent; D000328:Adult; D003463:Cues; D003479:Curriculum; D003867:Depth Perception; D005556:Form Perception; D006801:Humans; D008297:Male; D009549:Nigeria; D013028:Space Perception; D013334:Students