Have you noticed that it is easier to understand what someone is saying when you are looking at them versus when you cannot see them? This is due to sensory interaction. Sensory interaction is the working together of different senses to create experience. We experience sensory interaction when we eat or watch a movie, since the senses are used at the same time. Likewise, the visual aspect of the speech is as important as the hearing aspect. The McGurk Effect displays this, as it is an error in perception that occurs when we misperceive sounds because the audio and visual parts of the speech are mismatched. In this video, the person’s lips make the shape of “bah” and “fah”, and the audio all the way through plays “bah”. However, we hear a change in sound when his lips shape the word “bah” and when his lips shape the word “fah”. This illusion occurs when the auditory component of one sound is paired with the visual component of another sound, leading to the perception of a third sound. The visual information a person gets from seeing a person speak changes the way they hear the sound.
Another example of sensory interaction is synesthesia. Synesthesia is an experience in which one sensation creates experiences in another. Examples are experiencing color when tasting a particular food or by hearing sounds when seeing certain objects. Also, sensory interaction include the experience of nausea that can occur when the sensory information being received from the eyes and the body does not match information from the vestibular system.
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