The constant background hum

This is the fourth post in a series for autism awareness month. Previous posts covered the neurological vs. psychological distinction and what "spectrum" actually means (see link in the comments). This week: what runs in the background, all the time.

My mother often reminds me that when I was a child visiting friends, I would tour every room and every corner of their apartment before I could sit down and play. I had no idea I was doing it. I just couldn't settle until I had a complete map.
That pattern never went away.

There's a well-documented phenomenon in autism research called intolerance of uncertainty (IU): the nervous system's difficulty tolerating absent information. The research links it directly to how the autistic brain builds predictions: less automatically, less reliably than in neurotypical brains. The result is a system that needs more explicit data to feel oriented. So it collects data, constantly.

Everyone experiences some anxiety about the unknown. The difference in autism is in the mechanism and the scale. For me, the information-gathering isn't occasional, it's continuous, and it isn't very selective. Any piece of information feels potentially vital. If someone mentions an actor I don't recognize, I need to know who that is. Not out of curiosity, but because there might be a joke about that actor later. Everyone will laugh. I won't follow. And unlike most social awkwardness, I can't fake it convincingly without the underlying data. The gap isn't uncomfortable, it's a predicted failure.

This is what produces the constant background hum: not anxiety about anything specific, but the nervous system permanently scanning for gaps in the map, because any gap is a potential trapdoor.

Special interests are the inverse of this. A domain I know deeply is a domain with no trapdoors. The intensity and relief that come with a special interest aren't enthusiasm, they're the feeling of ground that holds. Talking about it at length isn't ignoring the other person, it's the only moment the scanning stops.

There is an upside to all this collecting though. A brain that has spent decades gathering fragments from unrelated domains ends up with an unusually dense web of cross-references. When something new appears, it rarely arrives in isolation: the system has already indexed something adjacent, something that rhymes, something from three fields over. Pattern recognition and unexpected correlations come almost automatically, not as a skill but as a byproduct of the constant scan. We'll talk more about that in a following post on STEM and IT.

This is part of my April 2026 autism awareness month series. First published on LinkedIn on 2026-04-09.