I’ve seen people online say ADHD causes “object permanence problems.”
Usually they mean something like: if the thing isn’t visible, they stop thinking about it.
I understand why the phrase caught on.
It’s also not what object permanence means.
Object permanence is a developmental concept
Object permanence refers to understanding that an object continues to exist even when you can’t see it.
Adults with ADHD don’t generally believe the leftovers ceased to exist because the container moved behind the milk.
The issue is more like: I knew they existed. I just stopped retrieving the information at a useful time.
Prospective memory is much closer to some of these stories
Prospective memory is remembering to carry out an intention in the future: send the form, take the package, make the call, move the laundry, bring the thing you deliberately placed somewhere “safe.”
Research has found adults with ADHD can have difficulties with everyday prospective memory. In one study, adults with ADHD recalled and executed fewer of their own real-life intentions, and prospective-memory performance was linked with procrastination. That study is here.
A 2026 study also found lower everyday prospective-memory performance in adults with an ADHD diagnosis compared with controls, while testing whether future-thinking strategies could improve follow-through. That study is here.
Working memory and retrieval can matter too
Working memory is the limited mental workspace used to hold and manipulate information while you’re doing something. Adult ADHD research has found difficulties in some executive and memory-related domains, although the exact profile varies by person and study. This meta-analytic review is useful background.
So if something disappears from view and then disappears from the active competition for your attention, that doesn’t mean your brain forgot the object exists in the developmental sense.
It may mean the cue that was keeping the intention active disappeared.
This is why visibility can work so well
I put things where I’ll see them because I don’t want remembering to depend on remembering to remember.
The package goes by the door. The calendar sits where I physically pass it. The thing I need tomorrow doesn’t get lovingly organized into a cabinet where it can achieve total privacy.
External cues aren’t proof of “object permanence problems.” They’re a practical way to reduce how much information has to remain internally active.
Why people still use the phrase
I don’t think people using “ADHD object permanence” are making up the experience.
I think they found a memorable phrase for “if I can’t see it, I may stop remembering it at the moment when remembering would help.”
The more accurate language is less catchy. It’s also more useful if we’re trying to figure out what might actually help.