Learning the 3-D structure of objects from 2-D views depends on shape, not format.

The test repetition effect ( d′ post − d′ pre) was significant for stereo and line drawings (all t s > 2.70, p s < 0.05, Figure 6b , diamonds) but was only marginally significant for shading objects ( t = 1.81, p > 0.05) and not significant for silhouettes ( t = −0.38, p > 0.05).

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