The mere exposure effect depends on an odor's initial pleasantness.

ANOVAs performed for each odor revealed a marginally significant increase in pleasantness for leather [ F (1,39) = 3.22, p = 0.08] and significant increases in pleasantness for the blank pen, lilac, and shampoo odors [ F s (1,39) = 25.45, 7.2, 5.47; p s < 0.001, 0.01, 0.05; η 2 s = 0.39, 0.15, 0.12, respectively; see Figure 1A ].

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