Infants also show signs similar to the McGurk effect. Obviously an infant cannot be asked what they hear since they cannot verbally communicate but by measuring certain variables such as their attention to audiovisual stimuli, effects similar to the McGurk effect can be seen. Very soon after infants are born, sometimes even within minutes of birth, they are able to imitate adult facial movements; an important first step in audiovisual speech perception. Next comes the ability to recognize lip movements and speech sounds a couple of weeks after birth. Evidence of the McGurk effect is not visible until about 4 months, with a much stronger presence at around 5 months. To test this effect on infants, infants are first habituated to a stimulus. Once the stimulus gets changed, the infant exhibits an effect similar to the McGurk effect. As infants grow older and continue to develop, the McGurk effect also becomes more prominent as visual cues start to override purely auditory information in audiovisual speech perception.
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