ADHD people seem very interactive and seem to be easily bored. As a consequence they seek out interaction and some can seem socially aggressive. They tend to push against any measure which restrains these activities. More of your E than your I dichotomy.
ADD I dunno exactly what the difference is compared to ADHD.
Aspies are usually quiet but have restricted behaviours and interests such as very idiosyncratic speech patterns. In addition do not like the usual modes of social interaction and can be very avoidant of eye contact and emotional reciprocation. They tend to push back hard when they feel pushed upon but otherwise will be non-responsive. More of your I than your E dichotomy.
Both have low levels of emotional control; although for the Aspies it's supposed to be more reactive to outside influences than something that just happens spontaneously without warning; although it can be misunderstood if something is left on the back-burner, especially in children which are somewhat expected to act 'in the moment' rather than holding back.
I love this entry on Wikipedia because it has the description most people I have seen wave about trying to 'grasp' at what Ni does:
Originally Posted by Some Random