Pitch-Color Associations are Context-Dependent and Driven by Lightness

Pitch-color associations have been widely explored in the context of cross-modal correspondences. Previous research indicates that pitch height maps onto lightness, and that high pitches are often associated with yellow and low pitches with blue. However, whether these associations are absolute or relative remains unclear. This study investigated the effect of context on pitch-color associations by presenting seven pitch stimuli (C4-B4) in randomized, ascending, and descending orders. A large sample ( N = 6626) was asked to select colors for each pitch using a color wheel. Results revealed that pitch height was linearly mapped onto lightness, with higher pitches associated with lighter colors. Notably, this mapping was influenced by context, as ascending sequences produced lighter colors and descending sequences resulted in darker colors compared to randomized presentations. Furthermore, lightness associations developed progressively, going from binary to linear as trials progressed. Saturation on the other hand did not follow a linear pattern but peaked at mid-range pitches and was not influenced by context. Additionally, compared to randomized presentation, color associations show a downward shift (i.e., reported for lower pitches) in the ascending presentation, and an upward shift (i.e., reported for higher pitches) in the descending presentation. These findings suggest that pitch-color associations are relative rather than absolute, possibly due to low ability to categorize pitches in the general population, with lightness appearing to emerge as the primary factor for color choices. This study contributes to the understanding of associations across sensory modalities, which may be a promising venue to investigate hidden cognitive processes such as sensory illusions.