Tasty vibes: Uncovering crossmodal correspondences between tactile vibrations and basic tastes

The interest in crossmodal correspondences individually involving the senses of touch and taste has grown rapidly in the last few decades. Several correspondences involving different tactile dimensions (e.g., hardness/softness, roughness/smoothness) have been uncovered, such as those between sweetness and softness and between roughness and sourness. However, a dimension that has been long overlooked, despite its pervasiveness and importance in everyday experiences, relates to tactile vibrations. The present study aimed to fill this gap and investigate crossmodal correspondences between basic tastes and vibrations. In the present study (N = 72), we uncovered these associations by having participants sample basic taste (i.e., sweet, salty, sour, bitter, umami) aqueous solutions and chose the frequency of vibrations, delivered via a consumer-grade subwoofer wristband on their dominant hand, that they most strongly associated with each taste. We found that sourness was most strongly associated with frequencies around 98 Hz, and that sweetness and umami were associated with frequencies around 77 Hz. These correspondences may, to different extents, be based on affective and semantic mechanisms. The findings have relevant implications for theoretical research on multisensory integration and perception and the potential future applications of these associations, through wearable technologies, to enhance eating experiences and promote healthier eating habits.