The vividness of mental imagery in virtual reality: A study on multisensory experiences in virtual tourism

This paper aims to evaluate how different combinations of multisensory stimuli affect the vividness of users’ mental imagery in the context of virtual tourism. To this end, a between-subjects experimental study was conducted with 94 participants, who were allocated to either a positive or a negative immersive virtual environment. The positive environment contained only pleasant multisensory stimuli, whereas the negative contained only unpleasant stimuli. For each of the virtual experiences, a multisensory treasure hunt was developed, where each object found corresponded to a planned combination of stimuli (positive or negative, accordingly). The results showed that positive stimuli involving a higher number of sensory modalities resulted in higher reported vividness. In contrast, when the same multisensory modalities were delivered with negative stimuli, vividness levels decreased - an effect we attribute to potential cognitive overload. Nevertheless, some reduced negative combinations (audiovisual with smell and audiovisual with haptics) remained effective, indicating that olfactory and haptic cues play an important role in shaping users’ vividness of mental imagery, even in negative contexts. • The full positive multisensory combination (Vision + Audio + Taste + Haptics + Smell) in Virtual Reality significantly enhanced users’ vividness of mental imagery. • Positive combinations of Vision + Audio + Taste + Haptics + Smell were less e!ective in enhancing the users’ vividness. • In contrast with the positive environment, the negative Vision + Audio + Taste + Haptics + Smell combination was the least effective in enhancing the users’ vividness, possibly due to sensory overload. • Negative audiovisual elements, when combined with either olfactory or haptic cues, emerged as more e!ective in enhancing users’ vividness.