by Michael J. Tarr, Heinrich H. Bülthoff
Psychological Science
http://www.cog.brown.edu/pub/tarrlab/pdf/Tarr_etal97.pdf
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Abstract:
We investigated how varying the number of unique parts within an object influencesrecognition across changes in viewpoint. The stimuli were shaded objects composed of five 3D volumes linked end-toend with varying connection angles. Of the five volumes, zero, one, three, or five were qualitatively distinct (e.g., brick versus cone), the rest being tubes. Sequential-matching and naming tasks were used to assess the recognition of these stimuli over rotations in depth. Three major results stand out. First, regardless of the number of distinct parts, there was increasingly poorer recognition performance with increasing change in viewpoint. Second, the impact of viewpoint change for objects with one unique part was less than that for the other objects. Third, additional parts beyond a single unique part produced strong viewpoint dependency comparable to that obtained for objects with no distinct parts. Thus, visual recognition may be explained by a view-based theory in which viewpoint-specific representations encode both quantitative and qualitative features.
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