It is said that the form of the perceptual cross-modal integration, including visuo-tactile integration, is basically weighted average. In this study, we investigated whether the visuo-tactile information about the impression, the product of the higher-level cognitive process, integrates in this way or not. The results suggested that the visuo-tactile impression of textures could be regarded as the weighted average of the visual and tactile impression. Further, the ratio of modality weights seemed to be unique to the evaluation and it would reflect the ratio of the likelihood, or the reliability of modality in the evaluation.
