It is more common simply because the triggering conditions are more common. This has been here since man likely. But todays technology is placing some kids and some of us adults into a world that is overtaxing our abilities to process the audio & visual events around us. The result can be Cognitive Behavioral Problems. That means depression, anxiety, agiation, and other reactions. Here is a great description a long read but worth it.
COGNITIVE ASPECTS OF VESTIBULAR DISORDERS
The Mental Health Profession does not look for this problem nor do many family doctors who refer a kid to a shrink.
Thanks for the links. I'm a family practice doc. I don't recall hearing about CAPD before. My sister is a teacher, who has taught Special Ed. Bookmarked and emailed.