How smell affects the colors we see

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24 adult women and men between the ages of 20 and 57 were subjected to a test by Ward and colleagues to determine the presence and strength of odor-color correlations. For the duration of the trials, the participants were seated in front of a screen in a space free of distracting sensory stimuli. None of them claimed to be color-blind or to have a compromised sense of smell, and neither did they wear deodorants or fragrances.

Participants were then asked to modify the color presented on a screen, adjusting the range until they reached the color they believed to be perceiving. “These results show that the perception of grey tended towards their anticipated crossmodal correspondences for four out of five scents, namely lemon, caramel, cherry, and coffee,” said Ward.

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