Suggestion #21: Use dulcet tones when speaking with the child.Many autistic children are hyper sensitive to stimuli. Speak in calm reassuring tones, even if you are starting to become frustrated with them. If you sound stressed, they may pick up on that and become stressed themselves. This stress will make it even harder for them to comply with your requests.
In other words, yelling or speaking harshly to an atypical person may get their attention and cause them to react quickly (think of the military boot camp and the drill sergeants yelling at the men and women to move faster). The opposite may happen if you raise your voice (even slightly) to try to have the autistic child react more quickly to your request. They hear the stress in your voice, and will react to it, causing their brain to become over stimulated and lower their ability to respond. Keeping this in mind is especially important in situations where the child’s safety is at risk.