But this clutter of information isn't restricted to your ears.. it spreads to all of your senses. Each sensation, from your shirt pulling against your arms as you move, to the smell of paper in your printer tray dominates your attention. And through all this, someone's talking to you, the sound is mixed in with everything else. It's hard to look up and listen at the same time; the more information in your field of view, the harder it is to focus on this one sound that's more important than the other sensations. They say 'look into my eyes when I talk', but that act makes it so much harder to separate their words from their image.
Some days are worse than others, some autistic people suffer this effect more, some less. At times, the mess of sensations becomes so great that they try to supersede all the sensations by creating one that's larger than all the others. If one sensation trumps the others, it gives the mind a reprieve. So they yell, they hit things, they jump about, bang their heads, fight against being held down, they do what they can to create this one sensation that drowns out all the others. And they're smart enough to know the effect this has on other people, but are unable to do otherwise. Some are unable to express themselves verbally, to explain what is happening. Some don't understand the benefit of talking, so they don't.
Autistic people generally become fixated on one item/concept/activity as a method of controlling these sensations. If their emotions are primed and respond to certain things, then it helps them control their sensations. You'll see this with parents of autistic children, because they know what toy to pass over to help the child. They know what activity needs to be done to help calm down an episode. Strangers are unlikely to know the specifics of the child, but your best bet would be to communicate with them in a way that caters to their condition. But sometimes, things are just bad and they just need to do things their own way. Ideally, you'd have them performing in routine activities in an environment that is free from most stimuli; parks are not likely a good choice, which is why this child reacted the way they did.
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my brother has autism and its really hard to take him out with out him throwing a tantrum and he will start hitting people and breaking things, if there one thing i learned is that every time i find a way to calm him down eventually it will stop working. try to find out what the child is interested in or if you can personally communicate with the child then tell them that if they behave they will get a reward. but dont all ways rely on it, autistic child are very clever and its hard to keep up with them. the best way is to make a strong bond and NEVER let them get their way if they know they cant win against you then they will give up and behave, having a strong personal bond will make a child want to behave around you.