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Inter-Modal Effects of Non-Simultaneous Stimulus Presentation

In environments where products are made use of and the product noise interferes with these activities (e.g. in the car, in an air plane, or when operating a machine or an appliance) non-acoustics factors like vibration, heat, visual effects may heavily influence the judgements on product-sound quality. Auditory virtual-reality generators are potent tools for psycho-acoustic research in complex, interactive auditory scenarios. They can be extended to serve as a tool for multi-modal psychophysics by including non-auditory modalities. Such multi-modal virtual-reality generators become more and more important as tools for product-sound-quality evaluation. However, the integration of further modalities may create problems. To gain a better understanding of the integration of auditory, visual and haptic information, it is necessary to specify which criteria have to be met with respect to temporal factors, particularly synchrony. The objective of this paper is to provide an overview on this topic.