Well, lately Ive begun to think that our sensory issues may be the cause. Think about it, if you're taking in 2 or more times the phsyical information (light, sound, taste, touch, smell) of course something is gonna get sacrificed. At the same time, since were taking in more information that could be to the benefit of our focus. As an example, consider a simple social situation (talking with someone). With NTs, the focus is spread evenly among the following (apologies if i forgot something): Listening (what is being said), eye movement, body language, facial expression, speech, sight, hearing (what else is going on), eye contact. For those in the spectrum, our emphasis is on Listening, hearing, sight, speech. The rest to us is often trivial, and takes up too much of our focus.
So, assuming we put a total of 16 points to those attributes (2 points per), we in the ASDs have 3-4 points in the listening, hearing, sight, and speech alone. So, since our physical object interpretation is enhanced, we put more into something of quantitative interest than NTs can.