The multisensory appearance of components for the vehicle interior essentially influences desirability and the perceived reliability of the product. Visual and haptic appearance must match and fulfill high expectations. Furthermore, sounds which are generated when surfaces are touched contribute to the overall impression. Smell facilitates the perception of comfort and positive emotions. In the very near future, the traditional role of interior surfaces will face major enhancement by including a variety of functions. Multifunctional surfaces in particular will substitute elements with a fixed function in the context of autonomous driving. Passive surfaces can take over heating functions, contribute to interior lighting, provide informative feedback sounds and speech, or serve as interactive screens with diverse input-output functions. Those innovative elements require specific optimization to ensure a positive and meaningful interaction of the senses for all operational modes. The main aspects of multisensory appearance of the vehicle interior thus need to be considered and analyzed in view of connections between the senses, i.e. multisensory integration. This enables a deliberate development of the perceived surface features for all senses involved. Furthermore, an optimal and plausible harmony across the senses can be achieved. This paper should provide an approach to this task.
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