I tend to agree with you, however, your statement is a bit too general.
Games like Nintendo, cartoons like Lion King, movies of high drama, and certain audio stimulis can set off ADD ADHD behavior in some C.A.P.D. kids.
The link is not absolute and is, as yet, unproven.
Additionally, this whole discussion, I feel, points up the need for increased attention to pre-natal care for infants in the womb. Special attention must be given to dietary concerns of the fetus. Granted, genetics plays a role. But, to ensure proper physiological development, special attention neeeds to be given to the nutritional aspect of any pregnancy, as well as screening out harmful chemicals that may be introduced by exposure to alcohol, tobacco and even common cold remedies.
The stakes are too high to take the gamble and do otherwise.
I would recommend treating these illnesses with medication instead of letting them run their course as the longer it is left untreated the more potential for damage. Streph can be added to this to and can cause what is called tics. Food allergies and genetics do play heavy into this as allergies and other underlying causes are hereditary.
But in general with sensory interpitation disorders the offending event can be limited to one specific event like a sound at a certain frequency or can involve most all the sensory spectrum both audio & visual. The cognitive symptoms seen with CAPD are secondary to the actual cause of it. Vestibular dysfunction is probably the most common and least diagnosed cause of such other nice problems as Anxiety Disorders. Again a researcher in the 1970's linked it. Look up Harold Levinson MD. A lot of his research in Psychriatry/Neurology is being confirmed outside the mental health circles an in Vestibular research. But Vestibular researchers recognize the cognitive aspects as secondary. In short Shrinks are not ENT Docs or Audiologist and commonly misdiagnose it as ADD ADHD.
BTW I am on disability with General Anxiety Disorder which is both audio and visual sensory triggered. In other words I'm non phobic. My personal experience in this comes from being diagnosed as ADHD over 35 years ago. I had a reaction to Ritalin and was taken off. Other neurological deficits are there as well that support CAPD but in the mid 60's who knew? IN 1994 I went into full anxiety disorder that the doctors couldn't figure out. Anti-Depressants were used and again a reaction took place. I found the answers to the puzzle in DR. Levinsons Book Phobia Free. For the first time the ADHD {he still uses the term} and the General Anxiety Disorder came together as a problem of a single origination.
A couple of years ago HBO did a special on Panic Attacks remember it? I do as someone taped it for me. That documentary was made to set off attacks in a substancial portion of persons with anxiety disorders due to the special effects they employed.
Here is the problem. What you see and hear must be interpited and processed for response from the brain. One of the portions involved in this is called the Fight / Flight portion close to the stem I think. Persons such as myself can watch a sitcom be laughing at the show and at the same time be in pre-attack or in an attack itself. The sensory system is sending danger signals to fight / flight. If you do not respond as the brain sees appropiate for the condition you get cognitive conflict or anxiety attacks. Finding the offending events takes a little detective work but can be done fairly easy by keeping a note pad handy. BTW this is the same situation that gives you such nice things as fear of heights. The brain is designed for survival. It like a computer runs checks on your CNS. Now let's say you are up on the roof and feeling uneasy or even down right cared to go to the edge. Is it a phobia? No! Not if you have Inner Ear damage known or unknown to you. The brain in it's checks and balances see's a problem or danger with you being in a high place. The fear is a defensive response to that. You may not realize you have poor balance but the brain knows the fact well.