Infants also show signs similar to the McGurk effect. Obviously you cannot ask the infant what they hear since they cannot verbally communicate yet 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 though until about 4 months of age, with a much stronger presence at around 5 months after birth. To test this effect on infants, infants are first habituated to a stimuli. Once the stimuli 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.