The cross-modal interaction between sound frequency and color saturation on consumer's product size perception,preference, and purchase

Extant literature has documented the direct effects of both sound frequency and color saturation on the perceived size of products. However, the cross-modal interaction effect of the two on size perception is yet unknown. Through three studies, this paper proposes that the effect of sound frequency on the perceived size of product is moderated by that product's own color saturation, and this further had downstream effects on consumers’ product preference and purchase when they possess predetermined product usage goals toward bigger/smaller sizes. Study 1 found behavioral evidence that only when the color of the product is in high saturation can the sound frequency significantly influence the perceived size of the product, with low (vs. high) frequency leading to larger (vs. smaller) perceived size. When the product's color is in low saturation, the effect of sound frequency on perceived size disappears. Study 2 adopted the event-related potential technique and found that high (vs. low) saturation elicited higher arousal (mirrored by P300 amplitudes). Sound frequency is first moderated by color saturation and was then mediated by arousal to affect the perceived product size. The above results were also replicated in the field (Study 3). Theoretical and practical implications are discussed.