While atypical sensory filtering is related to sensory sensitivities, not all unfiltered sensory data will trigger sensitivities. Remember the sounds I described hearing as I’m typing this? I’m not especially sensitive to any of them. I hear them and it’s hard to tune them out, but I don’t have a biological stress reaction to them. They’re just there and over the years I’ve grown used to having a lot of irrelevant aural data constantly pinging around in my brain.
In fact, I didn’t know until a couple of years ago that other people don’t hear all of those distinct ambient sounds when they’re engaged in an activity.
I suppose what’s happening in this case is my sensory gating is failing, letting the irrelevant sounds in. They get routed to an area of my brain that says, “oh, right, traffic, dog, sirens, rain, typing, closer traffic, harder rain, actually two dogs, footsteps upstairs” and on and on.
What should happen when I hear those repetitive background noises is something called habituation. The first time the dog down the hall barks, my filtering system might kick it upstairs to my decision making brain and say, “hey boss, is this something we need to worry about?” The decision making region would analyze the situation, decide that the dog is neither a threat nor any of my business, and say, “nope, ignore that from now on.” The filtering system would then flag that gate for closing, eventually tuning out the repetitive barking until I stopped noticing it.
Because that doesn’t seem to happen reliably, my conscious brain gets tasked with repeatedly ruling out these sounds as unimportant. That’s distracting, but it’s not unbearable. Continue reading Sensory Sensitivities: Understanding Triggers