• Cees can Leeuwen
  • Gijs Plomp


We review three recent experimental papers in which we studied amodal completion of partly occluded figures. Here we highlight the issue of the ‘mosaic effect’. In a primed same-different task test pairs were preceded by a sequence of two priming figures. Congruent preceding shapes were expected to prime the task figures. Congruency of both preceding shapes should lead to a super-additive priming effect, in case one non-target also primes the other. We observed priming between non-targets, one of which was a single, the other a composite figure. Composite figures contained a square that appeared to occlude part of the visible shape of a single figure or to add a mosaic fit to it. Single figures primed local and global occlusion, as well as mosaic interpretations of the composite ones. Priming between non-targets occurred only when the composite figure was presented briefly (50 ms), indicating that preceding context biases possible interpretations during the process of completion, rather than afterwards.


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