From ages three to five, a child's overall vocabulary increases at an extraordinarily fast pace. Communication during this stage occurs through both cognitive learn as well as through understanding the nuances of social etiquette and cultural norms. There are many different types of learning mechanisms associated with communications. Understanding nonverbal communication usually occurs at a subconscious level in the early days of birth, but extends to increasingly complexity until the ages of four or five when they should have considerably mastered a cognitive approach to both verbal and nonverbal communication.

For children with autism, the communication development process is very different. Since one of the key communication mechanisms at the infant stage is nonverbal, the development of voice recognition, crying, and other methods of nonverbal communications are important. Autistic children in contrast do not show special interest in their surroundings, especially in faces. Thus, at an infant level they already...
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