Mixture of easy trials enables transient and sustained perceptual improvements through priming and perceptual learning.

In learning, the group accuracy effect from individuals with non-significant effects still failed to reach significance ( t (53) = 0.01, p = 0.99), evidence consistent with noise.

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In contrast, for priming, 78 participants showed improvements in identification accuracy, and 98% of them also showed corresponding improvements in ratings, a much higher ratio than that in learning ( X 2 (1, N = 91) = 16.21, p < 0.001). Obviously, some positive effects did not reach statistical significance at the individual level (as marked by white contours in Fig. 3a ), which may reflect either noise or true effects that went undetected because of low statistical power.

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