A, Target and distractors. During training, each distractor shared one component with the target. For the purposes of this illustration, the shared components are highlighted in red. One component appeared in four of the six distractors, while the other component appeared in the remaining two. B, Performance on recognition of trained (blue) versus untrained shapes that either shared (red and yellow) or did not share (green) a component with the trained shape. There was significant improvement in recognizing untrained shapes that shared either component with the trained shape but not for shapes with no shared components. Single subject, Error bars represent SEs across individual blocks. *p < 0.01; **p < 0.001, compared with the pretraining levels of performance.