The McGurk effect is a perceptual phenomenon which demonstrates an interaction between hearing and vision in speech perception. It suggests that speech perception is multimodal, that is, that it involves information from more than one sensory modality. The McGurk effect is sometimes called the McGurk-MacDonald effect. It was first described in a paper by McGurk and MacDonald (1976). This effect may be experienced when a video of one phoneme's production is dubbed with a sound-recording of a different phoneme being spoken.