Why Clients "Forget" Their Exercises but Remember Every Slight

2 days ago

8 min read

Written by Hollis Brennan, LPC, CSP

Three weeks into a shoulder PT program, a client has forgotten to do their homework exercises every week. But he can tell you, verbatim, what the intake nurse said about him fourteen months ago when she thought he was out of earshot. He can tell you her name. He can tell you what she was holding.

From the outside, that looks like a choice. It looks like he remembers what he wants to remember. That interpretation has a way of ending up in a chart note, "willful non-compliance," and that can affect relationships with treatment providers, as well as affecting treatment providers' willingness to continue working with clients like this.

We want to turn the camera around, because from the inside, those two facts aren't in tension at all. They're the predictable output of two different memory systems in an injured brain.

Two kinds of Memory

Here's the way we've come to explain it.

Remembering to do exercises at 4pm is a note survivors have to remember to read or connect the clock to an action. There is no announcement or interjection into one's life without effort (assuming no reminder is set). This type of memory waits for survivors to independently generate the thought "check my task list." This is called prospective memory, and the "do PT exercises at 4pm" version is the most demanding kind there is.

Mioni et al. (2012) found that time-based prospective memory in particular leans hard on executive function and on time perception itself, two of the most reliably disrupted domains after brain injury. Shum, Fleming, and Neulinger (2002) laid the groundwork in showing prospective memory failures after brain injury as a primary driver of lost independence.

What the nurse said is a different kind of memory entirely. It's like a task list that reads itself to survivors over and over. The memory comes and finds them at 2am. Emotionally arousing moments get encoded with the amygdala fully involved, and that involvement produces a stronger, stickier, longer-lasting trace. LaBar and Cabeza (2006) mapped how amygdala activity during encoding drives that enhancement. After a brain injury, that amygdala-memory encoding system is in overdrive. Weis and colleagues (2022) describe brain injury as associated with heightened fear learning and changes in the amygdala support the very mechanism by which emotional memories are strengthened.

So: Prospective memory needs your client to go get the memory. Emotionally encoded memories come and get them*.

That's not selective attention or spite. That's a person whose retrieval-on-demand is compromised and whose threat-tagged encoding is running hot. Of course the insult stuck without taking notes.

*Obviously oversimplified — these systems talk to each other constantly, and "prospective memory" isn't one thing.

Is it apathy? Is it depression?

There's a second thing broiling under a lot of undone home programs, missed appointments, and forgotten rehabilitation exercises.

Apathy after brain injury is common, in fact Lynch and colleagues (2025) pooled the literature and landed on a prevalence of 37.58% (95% CI: 28.45–47.15%). Roughly a third to a half of brain injury survivors experience apathy. Apathy alone is not depression, even though apathy is a part of the diagnostic criteria for depression and they do look alike. Apathy is often an initiation problem when the wanting is intact but the starting isn't. A client can genuinely want to do the exercises, be glad you assigned them, feel bad about not doing them, and still not be able to generate the initiating push.

If we treat an initiation deficit as a motivation problem, we'll cheerlead, motivational interview, and refer for the wrong problem. Cheerleading does nothing for initiation. If we treat it as depression, we might refer for an antidepressant that may be inappropriate. Screen for the other symptoms of depression to rule it or rule out with screeners like the PHQ-9 or TBI-QOL.

*that 37.58% figure comes with an I² of 90.3%, which is enormous heterogeneity.

The Deeper Reason

And then there's the third thing, which isn't a cognitive output necessarily.

We've worked with many survivors who wouldn't set a phone alarm for their exercises. Every workaround, accommodation, and scaffolding plan we offered, they had a reason it wasn't for them. Finally, in therapy talking about identity, they say it: "I'm not the type of person who needs an alarm to remember everything."

This is where the meaning a client makes of the task matters more than the capacity, interest, or intent to complete the task.

In the Duende Model of Self-Reconstruction, we'd say this the rejected self doing its job. It's the actual self that needs the alarm, and in their mind, in their recorded memory of who they are, they just aren't that person (yet). Complying with the homework we assign sometimes means that person is directly confronted with their changed life. Understandably, some clients would genuinely rather not complete the program than face that fact, even when the program is designed to help them recapture a sense of self they are more familiar with.

That refusal to participate is not irrational. It's not even unhealthy, necessarily. It's straight-up grief. But it will read as "poor adherence" in most of our documentation systems. Perhaps it's time to create a checkbox for: he is not ready to be someone who needs this yet.

Even when timing is of the essence in rehabilitation, even when the recovery process depends on specific protocols at specific post-injury critical moments, we have to honor the need to grieve and support that process. This is their life, this is their loss.

Helping professions:

what this looks like in the room

Here's the good news!

Donoso Brown and colleagues (2025) followed 77 people with acquired brain injury through their home programs and found something usable: "Higher self-efficacy, fewer reported barriers, and the perception of social support were all predictors of self-reported home program adherence."

Self-efficacy is buildable. Barriers are removable. Social support is arousable.

Strategies:

Make it event-based, not time-based. "At 4pm" asks for the hardest kind of remembering. "Right after you brush your teeth" borrows a cue that's already anchored and reliable.
Shrink the program, then build on that success. Three reps done every day beats twenty prescribed and zero done. Early wins are how self-efficacy gets built, and self-efficacy is a predictor for program adherence.
Ask about barriers before you write the program, not after it fails. Cognitive fatigue is an underreported and under-inquired symptom that impacts capacity. Our accessibility intake form is built for identifying barriers like this.
Recruit one more human. Social support is a big predictor of outcomes. A partner who does the reps alongside them, a daily text from a sibling, a coach, a friend- help recruit someone by name before the client leaves.
Talk about the identity cost with clients. If you suspect the alarm refusal is related to grief, say so kindly. "Some people tell me that using a reminder feels like admitting they've changed. Does it feel like that to you?" You will be astonished how often the answer is yes, and how much moves once it's said.

What to say instead of "Did you do your exercises?"

That question has one right answer and one that induces shame.

Try these:

"Walk me through what a day looked like when the exercises didn't happen. I'm not judging — I'm looking for where my plan didn't hold up for you."

"Based on the last week, what can we do to make these exercises fit better into your life?"

"Which part of this do you hate? I'd rather redesign it than keep prescribing something that sucks for you."

That last one buys more trust and tells the client the program is negotiable but the relationship isn't.

Charting Changes

An undocumented executive function deficit leaves no trace. If nothing shows up on a brain scan, nothing shows on the surface, and the person can hold a perfectly coherent conversation with you about the exercises they did not do, evidence of executive dysfunction may not make it into the chart notes for other providers. That's the Invisibility Gap, a real disability with no immediately visible evidence, missing qualitative data, and a documentation system that often encourages us to fill the vacuum with a character judgment.

Once "poor adherence" or "declined recommendations" is in the record, it travels. It travels into review, where it can become a reason to stop authorizing sessions. It travels into disability determinations. It travels into custody evaluations and probation reports and IEP meetings. And the further it travels from you, the more it reads as choice not to engage rather than brain injury sequelae inhibiting initiation.

What a clinician, a school, or a court could do differently:

Write the mechanism, not the behavior. "Client did not complete home program; presentation consistent with time-based prospective memory and initiation difficulty. Program revised to event-anchored cues."
Treat non-adherence as a screening flag. Someone repeatedly missing appointments, losing paperwork, or not carrying over instructions is someone who should be screened for brain injury, especially in settings where nobody thinks to ask: probation, shelters, IPV services, workforce programs.
Stop letting adherence gate access. If your program discharges people for missed sessions, it is systematically discharging exactly the population it was built for. That's a policy you can change.

when to get help

This piece is about the everyday, chronic version of the problem like the home program that doesn't get completed. It is not about acute injury, and it's not a substitute for evaluation.

Call 9-1-1 or go to the nearest emergency room or urgent care if:

A sudden, sharp change in memory, initiation, or personality occurs, especially a new decline months or years after injury. Brain injury is a chronic condition that needs ongoing monitoring, but new decline is not the expected course and warrants a workup.
Worsening headache, repeated vomiting, seizure, weakness on one side, confusion, or trouble waking, go to the emergency department immediately.
Withdrawal, hopelessness, or any thought of self-harm. Apathy and depression can look alike and can coexist; a person can have both. Get a real evaluation with a brain injury informed therapist.

Frequently asked questions

Q: Why do brain injury survivors remember hurtful comments but forget instructions?

A: They're two different memory systems. Remembering an instruction for later requires you to generate the reminder yourself; that system is often damaged in a brain injury. Emotional memories get encoded with the brain's threat system involved, which makes them stronger and stickier.

Q: What is prospective memory?

A: It's remembering to do something in the future. "Take your medication at 8pm" is prospective memory. It's different from remembering facts or past events, and it's one of the most commonly affected abilities after a brain injury.

Q: Is not doing home exercises after a brain injury a motivation problem?

A: Usually not. It's more often a prospective memory problem, an initiation problem, fatigue, or a barrier in the environment. Research on home program adherence found that self-efficacy, barriers, and social support predicted follow-through, not how much the person wanted to recover.

Q: What's the difference between apathy and depression after a brain injury?

A: Depression involves low mood, hopelessness, and often guilt. Apathy is a problem with starting things. For example, a person can want to do something, feel bad about not doing it, and still be unable to generate the push to begin. They often occur together, and they need different treatment.

Q: How common is apathy after a brain injury?

A: Common. A 2025 review pooling many studies estimated around a third to nearly half of people, though the studies varied a lot in how they measured it.

Q: How can I help someone actually do their home program?

A: Tie each exercise to something they already do every day. Make the program small enough that they can experience some wins. Ask what's getting in the way before you write it. Recruit one specific person to do it with them.

Q: Why does my family member get angry when I remind them to do their exercises?

A: Sometimes the reminder isn't heard as help; it's heard as evidence that they've changed or that something is wrong with them. That's not stubbornness, it's grief. It often helps to name the grief directly and ask what kind of support would actually be helpful. Try talking when emotions are regulated and from a place of compassion.

Disclaimer: The information provided by Brain Injury Therapy is for educational purposes only and is not a substitute for medical, psychological, or legal advice. It is not intended to diagnose, treat, cure, or prevent any condition. Every person's medical and psychological history is unique, and readers should consult with qualified healthcare professionals before making decisions about diagnosis, treatment, safety, or care planning. Reading this article does not create a therapeutic relationship with Brain Injury Therapy, and the content should not be used in place of individualized evaluation or treatment. If you or someone you support is experiencing a medical or mental health emergency, call 911 or go to the nearest emergency department.