Some people perceive sounds to have colours, or numbers to have locations. This type of cross-modal experience is called

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Synesthesia is a neurological condition in which the stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. Synesthetes can experience a variety of cross-modal sensations, such as seeing colours when they hear sounds or tasting flavours when they see certain textures. The McGurk effect refers specifically to the visual effect on speech perception, in which an individual perceives a different sound than what is actually being said based on the movement of the speaker's lips. Parallel processing refers to the ability of the brain to process multiple types of sensory information at the same time. Colour constancy is the ability of the brain to perceive the colour of an object as stable, despite changes in lighting conditions.

Some People Perceive Sounds to Have Colours, or Numbers to Have