By Mark Ryan, BACP Accredited Psychotherapist and NCPS Accredited Relationship Therapist, individual therapy in London
You leave the room and, for your partner with ADHD, it can seem as if you stop existing. The message you were meant to answer goes unanswered, the plan you made together fades, and the thing you said last night has gone. Many people call this "object permanence", and although the term is borrowed, the experience is real and it can hurt. This article explains what is going on, why it can affect the things and people that matter most, and how couples can work with it.
Article Summary
Object permanence in ADHD is a popular name for out of sight, out of mind, which is mainly about memory, planning and attention and not about caring.
Forgetting to do something later, called prospective memory, is a recognised area of difficulty for adults with ADHD.
Working memory and a different sense of time can add to it, and important things get forgotten too, not just small ones.
For a partner it can feel like being forgotten, so understanding the cause is a big relief, and the impact still deserves to be taken seriously.
Visible cues, linking reminders to habits, and shared systems help, and therapy can help couples hold both sides.
The Name Is Borrowed
Object permanence is a term from child development. It describes the moment a baby learns that something still exists when it is out of sight. Adults with ADHD do not lose that understanding. Your partner knows you exist when you are at work or out of the room. What is going on is more like out of sight, out of mind, where something is not in their attention, so it does not prompt them to act. The popular label may be useful for some people as shorthand, but it is important we remember it describes memory and attention and not a belief that you have vanished.
What It Looks Like
It might be a friend they meant to message and did not, a plan to ring a parent that slid away, a bill left in a pile, or the thing you asked them to pick up on the way home. It can also look like a partner who is warm and attentive when you are together and then seems to forget to reach out while you are apart. Many people with ADHD describe real surprise at how long has passed.
Why It Happens
Remembering to do something in the future is called prospective memory. It asks the brain to form an intention, hold it, notice the right moment, and then act, all without anyone prompting you. A study comparing 45 adults with ADHD with 45 matched adults found a large difficulty in the planning part of complex prospective memory tasks, with small or negligible differences in recalling the plan, starting the task and carrying it out (Fuermaier et al., 2013). In plain terms, a lot of the trouble was in forming and organising the intention in the first place. A later study of 29 adults with ADHD and 24 comparison adults found clear difficulties in everyday prospective memory, and that these helped to explain the link between ADHD symptoms and procrastination (Altgassen et al., 2019).
Working memory may add to this for some people. If the mental notepad is small and easily wiped, an intention can slip away within minutes of forming it, especially if something new comes along. A large review found that groups with ADHD showed weaker working memory and planning on average, though not in every individual (Willcutt et al., 2005).
Time plays a part. A review of studies found consistent differences in how people with ADHD sense time and plan for the future (Noreika et al., 2013). If the future feels hazy and "now" is loud, a task for later, or a person who is not here, can drift away.
Timing differences are one possible reason some people with ADHD run late, although the research itself looked at timing and not lateness. Many people with ADHD describe starting a small task and looking up to find an hour gone, or believing they have time for one more thing and missing the moment to leave. For the partner who is waiting, this can feel disrespectful, especially on days that matter to them.
Interest and urgency matter as well. Differences have been found in the dopamine reward pathway in adults with ADHD (Volkow et al., 2009), and in everyday life tasks that feel urgent, new or exciting do seem easier to hold than quiet, ongoing ones such as keeping in touch or following through on a plan.
Importance is not what decides whether something comes to mind. It might seem that someone would never forget what matters most, but in my experience the brain can care enormously and still not bring the thought up at the right moment. For many people this is the most painful part, because they know it matters, and they still miss it.
How It Lands in a Relationship
For the partner without ADHD, it can feel as if you are only present when you are in the room. You may become the one who reminds, follows up and holds the memory for both of you. The reminding may start to feel like nagging, and the lack of initiative from the other side may start to feel like not caring. This is where a particular kind of loneliness often arrives.
For the partner with ADHD, it can feel like being constantly caught out. You may hear "you always forget" and feel both sorry and defensive, and you may have worked hard to remember. Over time, many people begin to avoid conversations about it altogether.
Because the pain on each side is real, both partners deserve to have it taken seriously. Understanding the cause does not mean ignoring the impact. It means working out what to change.
What Helps If You Have ADHD
Make the invisible visible. Out of sight means out of mind, so put things where you will see them, such as a note on the door, a task on the table or the object that needs taking in the bag by the door.
Use the moment, not memory. Set the reminder as soon as the plan is made, and make it specific. "Ring Mum, 6pm, before dinner" works better than "ring Mum". Attach tasks to habits you already have, such as making coffee or brushing your teeth.
Picture it. A recent study of 63 adults with ADHD and 64 comparison adults found that imagining carrying out an intention in a vivid way increased how many everyday intentions were carried out, although the effect was no longer significant once verbal ability was accounted for. The authors describe the results as preliminary support (Altgassen et al., 2026). It is a simple technique that costs nothing to try.
Reach out first and say it. "I got swept up and forgot to text, I'm sorry, I'm here now" is a way to bridge the gap. Small, regular contact, even a message with a photo or a single word, builds a pattern your partner can rely on.
Lateness is worth planning for directly. Practical help includes working backwards from the time you need to arrive and setting an alarm for when to start getting ready, not only for when to leave. Build in a buffer for things that tend to go wrong, such as finding keys. Some couples agree that a partner who is waiting can message at a set point so that the late partner can respond with a clear update. Keep the aim kind and not punitive, because lateness can feel humiliating to many people with ADHD, and shame can make time management worse.
Nobody believes a partner has ceased to exist because they've left the room.
What Helps If Your Partner Has ADHD
Ask for what you need in a form that works. A direct, specific request near the time, such as "can you pick up milk on the way home? I'll text you at five", is easier than a general hope. Written is often better than spoken. A shared list that both of you can see takes the weight off one person's memory.
Try not to read the forgetting as a message. It is helpful to ask yourself, "is this the kind of thing their brain drops?" before deciding what it means. You can still say that it hurt.
Couples often ask how to tell forgetting from avoiding, and the honest answer is that it can be hard and that both happen in all relationships. In my experience, some clues can help. Forgetting tends to be uneven, so the same person remembers a favourite thing and misses a boring thing. It tends to come with surprise or regret as soon as it is noticed. It is also often paired with real effort, such as lists and alarms that did not quite work. Avoiding, by contrast, tends to come with a pattern of delay on one particular task, irritation when it is mentioned, and little attempt to put a plan in place.
If you are not sure, ask in a curious voice. "Did this one slip away, or is something making it hard to do?" gives your partner room to be honest. If it is avoidance, you can talk about that directly, and it may point to something else, such as dread, resentment or a task that feels too big.
You do not have to be the only memory. If you are the household's project manager, remember that the aim is for neither of you to have to remember by willpower.
What Helps Together
Choose one shared place for plans, tasks and promises, and check it at a set time each day or week. Agree on how to handle a dropped ball without turning it into a trial. A short "what would have helped?" works better than a long postmortem.
Because out of sight is out of mind, small rituals can keep you in each other's awareness. A message at lunch, a shared photo, a call on the commute, or a regular weekly walk can all work. They do not need to be long, and they help most when they are predictable. For the partner with ADHD, attaching the ritual to something already habitual, such as the end of the working day, makes it more likely to happen. If you are the partner who is waiting, notice and thank the effort, because for a brain that finds this hard, every message is a small piece of work.
Some couples also keep a short shared note of things that matter this week, such as an appointment, a friend's birthday or a favour promised. It gives both of you a place to look and cuts the number of times one person has to ask.
Time apart tends to magnify this pattern. Work trips, long distance, night shifts and busy seasons can leave the partner without ADHD feeling forgotten and the partner with ADHD feeling guilty and hesitant to reach out. Agreeing a rhythm of contact in advance, such as a short call at a set time, protects against the drift. It also helps to talk about what each of you will take to mean silence, because the gap is easy to fill with the worst story.
If a pattern continues to be painful, read about how to stop arguing with your partner and why you may feel unheard. The hub article on ADHD and relationships explains the wider picture, and impulse control and ADHD and rejection sensitivity in ADHD cover the patterns that often sit alongside this one.
Being Kind to Yourself
If you have ADHD, years of being told you forget can leave a deep sense of failing at the basics. It helps to remember that you are working with a memory system that behaves differently, and that building supports is a sign of care and not of weakness. If you are the partner, you may be tired of carrying the memory for two, and that tiredness is real. Both of you deserve patience, and neither of you has to do this perfectly.
Questions Couples Often Ask
Why do they remember some things perfectly? Interest and urgency help the brain hold on, as described earlier, so a subject they love or a deadline that is close can stay in mind while quiet commitments drift. It does not mean they can simply choose which to remember.
Should I stop reminding them? Reminding is fine when it is agreed. The trouble comes when one person becomes the permanent alarm clock. Try agreeing which reminders come from you, which from a phone, and which from a shared list.
Is it fair to be upset? Yes. Being forgotten hurts whatever the cause. You can say it hurt and also work on a solution together.
A Workbook For Couples
If forgetting and being out of sight keeps hurting, my ADHD and Your Relationship workbook for couples may help. It treats ADHD as a shared situation and not a personal failing. It has pages to explore why it happens, how it feels from both sides, and how to agree a system you both trust. It is a fillable PDF, so you can type on screen or print it.
How Therapy Can Help
In couples therapy, we look at what forgetting means to each of you. For one partner it may mean "I'm not important", and for the other it may mean "I always fail". Bringing those meanings into the open can change the whole conversation. We can also build systems that suit your lives and rebuild the sense that you are held in mind by each other.
You do not need a diagnosis to start. If you are unsure about timing, when to go to couples therapy can help.
If you would like support with this, I offer a free 30 minute consultation, in person in London or online, for couples of any gender or orientation, and for open and non monogamous relationships too.
About the Author
Mark Ryan is a BACP Accredited Psychotherapist and NCPS Accredited Relationship Therapist working in person across central London, from rooms in Pimlico, Kensington, and Angel. He works with couples, individuals, and polycules on relationship issues including jealousy, affairs and betrayals, sex problems, and considered separation. His practice is integrative, sex-positive, and affirming of all relationship structures and identities.
References
Altgassen, M., Heinrich, H., & Edel, M. A. (2026). Episodic future thinking improves everyday prospective memory performance in adults with a previous diagnosis of attention deficit hyperactivity disorder by community providers. Journal of Attention Disorders, 30(5), 705 to 721. https://doi.org/10.1177/10870547261416467
Altgassen, M., Scheres, A., & Edel, M. A. (2019). Prospective memory (partially) mediates the link between ADHD symptoms and procrastination. ADHD Attention Deficit and Hyperactivity Disorders, 11(1), 59 to 71. https://doi.org/10.1007/s12402-018-0273-x
Fuermaier, A. B. M., Tucha, L., Koerts, J., Aschenbrenner, S., Westermann, C., Weisbrod, M., Lange, K. W., & Tucha, O. (2013). Complex prospective memory in adults with attention deficit hyperactivity disorder. PLOS ONE, 8(3), e58338. https://doi.org/10.1371/journal.pone.0058338
Noreika, V., Falter, C. M., & Rubia, K. (2013). Timing deficits in attention deficit/hyperactivity disorder (ADHD). Evidence from neurocognitive and neuroimaging studies. Neuropsychologia, 51, 235 to 266. https://doi.org/10.1016/j.neuropsychologia.2012.09.036
Volkow, N. D., Wang, G. J., Kollins, S. H., Wigal, T. L., Newcorn, J. H., Telang, F., Fowler, J. S., Zhu, W., and colleagues (2009). Evaluating dopamine reward pathway in ADHD. Clinical implications. JAMA, 302, 1084 to 1091. https://doi.org/10.1001/jama.2009.1308
Willcutt, E. G., Doyle, A. E., Nigg, J. T., Faraone, S. V., & Pennington, B. F. (2005). Validity of the executive function theory of attention deficit/hyperactivity disorder. A meta analytic review. Biological Psychiatry, 57(11), 1336 to 1346. https://doi.org/10.1016/j.biopsych.2005.02.006
