Insight and Behaviour After Brain Injury

Insight and behaviour after brain injury

The effects of a brain injury that end up in medical records are the physical ones. The effects that end relationships, lose tenancies, destroy employment and put people in police cells are behavioural.

And of those, the single hardest is not aggression or impulsivity. It is the loss of insight — because a person who cannot perceive that anything has changed cannot be persuaded to accept help, cannot agree that they should not drive, and experiences everybody around them as having inexplicably decided to interfere in their life.

This guide is about that territory. It is written for families, who carry most of it, and for support workers, who need to understand what they are looking at. The practical and regulatory side — behaviour support plans, restrictive practices, what providers must do — is covered separately in behaviour support and restrictive practices.

Why behaviour changes

The frontal lobes do most of what we think of as personality: inhibiting impulses, reading social situations, anticipating consequences, regulating emotion, generating motivation, and monitoring our own behaviour against some internal standard.

They are also the most commonly damaged region in traumatic brain injury, for mechanical reasons. In a high-speed deceleration the brain moves inside a rigid skull, and the floor of the skull behind the eyes is a ridged, uneven bony surface. The frontal and temporal poles scrape across it. So the region that regulates behaviour is the region most reliably injured.

This has a consequence worth stating plainly, because it changes how families respond: the behaviour is a symptom of the injury in exactly the way that weakness in an arm is a symptom of the injury. It is not a character change, a choice, or a revelation of who the person really was.

That does not make it easier to live with. Knowing that disinhibition is a frontal lobe injury does not make being insulted in front of your children feel neutral. Both things are true at once.

What actually changes

Disinhibition

The loss of the filter between impulse and action. Saying the thing rather than thinking it. Commenting on a stranger’s appearance. Swearing in front of children. Sexual comments or behaviour that would previously have been unthinkable. Spending money impulsively. Eating or drinking without a brake.

Disinhibition is the effect that most isolates people, because it makes ordinary social settings unsafe for the family and embarrassing for everyone. Families stop inviting people over, stop going out, and the person’s world contracts.

Impulsivity and poor risk judgment

Acting without weighing consequences. This shows up financially — large purchases, scams, lending money, gambling — and physically, in a reduced appreciation of danger.

It is also what makes financial safeguarding necessary and difficult. Our view, and it is contested: graduated arrangements beat removal. A limited-balance account for independent spending, a second signatory above a threshold, transaction alerts to a trusted person. Stripping an adult of all financial control after one bad decision is common and usually disproportionate.

Irritability and aggression

Short fuse, disproportionate anger, and in some people physical aggression. This is the behaviour most likely to produce a crisis — a police callout, a hospital admission, a tenancy ending, a provider withdrawing service.

The single most useful thing to understand about post-injury aggression is that it is usually reactive and usually triggered, not random. The triggers recur with remarkable consistency: fatigue, pain, noise, crowding, being rushed, being told what to do, being corrected, a change of routine, too many demands at once, too much information at once, and being physically touched without warning.

Which means most of it is preventable by changing the environment rather than the person. More on this below.

Emotional dysregulation and lability

Emotions that arrive at full intensity and disproportionate to the trigger, and crying or laughing that does not match how the person feels. The latter — sometimes called pseudobulbar affect — is neurological rather than emotional, and it is treatable, which is worth knowing because almost nobody mentions it.

Apathy, which is not depression

Reduced motivation and initiation. The person does not start things. They will participate, often willingly, when something is started for them, and stop when the prompt stops.

The distinguishing feature is the emotional content. A depressed person usually feels bad — sad, hopeless, worthless. Somebody who is apathetic will frequently report feeling fine. Ask whether they are unhappy and you may get an entirely sincere denial — the problem is starting, not mood.

This matters because apathy gets read as laziness, including by professionals, and because antidepressants generally do not help apathy in the absence of depression. What helps is structure: external prompts, routine, scheduled activity, somebody else starting the task.

Being accused of not trying, when the deficit is in the initiation system itself, is one of the more painful experiences available to a person with a brain injury.

Rigidity and perseveration

Difficulty shifting from a topic, an idea or a plan. Returning to the same grievance repeatedly. Difficulty tolerating change. This is often misread as deliberate obstinacy.

Anosognosia: the loss of insight

The hardest feature, and the one that most reliably breaks families.

Anosognosia is an impaired capacity to perceive one’s own deficits. It is not psychological denial — the person is not refusing to face bad news. The neural apparatus that monitors their own performance is itself damaged, so there is no internal signal that anything is wrong.

A person with significant anosognosia may:

• Insist they have fully recovered
• Want to drive, and believe they are safe to
• Want to return to work, and not understand why the employer will not have them
• Attribute every difficulty to external causes — bad luck, other people, poor instructions
• Not understand why they need support, and resent the people providing it
• Make plans that cannot work, and be genuinely baffled by objections

The consequences are serious. People with poor insight are at high risk of falls and accidents because they do not account for their own limitations. They resist support they need. They are hard to keep safe. And they place their families in the role of permanent obstacle.

What does and does not work

Arguing does not work, because you are not arguing with a belief that evidence could change. Repeatedly telling someone they have a brain injury and cannot do something produces conflict and no insight.

Demonstration works better than assertion. Allowing a safe attempt at a task and letting the outcome speak is more persuasive than any explanation. The judgment call is which attempts are safe enough to permit, and that is where occupational therapy input is valuable — an OT can construct situations that generate real feedback without real risk.

Video feedback is used in some rehabilitation settings and can be powerful.

Insight is often partial and task-specific. Someone may accept they cannot manage money and insist they can drive. Work with the parts they accept.

Insight sometimes improves slowly over the first years, and sometimes does not.

Externalise the authority. This is the most practical tip in this guide. Where something must not happen, it is far more workable for the prohibition to come from an institution than from a family member. The licensing authority says you cannot drive. The doctor says not yet. The bank requires a second signature. That removes the family from the role of the person standing in the way, which preserves the relationship and reduces the conflict.

Reducing behaviours of concern

What works is overwhelmingly environmental and preventive, not consequence-based. Approaches built on rewards and punishments assume intact learning and memory, which is precisely what is impaired.

Find the pattern. Record incidents with what happened immediately before — time of day, who was present, noise, what was being asked, how long since eating or resting. Patterns emerge within a fortnight and they are usually obvious once written down. Most “unpredictable” behaviour is highly predictable.

Treat fatigue as the primary trigger. It is. Behaviour is almost always worse late in the day and after a demanding morning. Front-load the day and protect rest.

Rule out pain and illness before anything else. Headache, dental pain, constipation, urinary infection, poor sleep, medication side effects. A person with reduced communication and reduced insight may not report pain and will show it as behaviour. New or escalating behaviour warrants a medical review, not a behaviour plan.

Reduce demands and give more time. A large proportion of incidents are a person being asked to do too much, too fast, with too little processing time.

Lower the sensory load. Competing noise, too many people, a television running under a conversation, harsh overhead lighting, the middle of a shopping centre on a Saturday.

Warn before touching, and before any change.

Keep routine stable and introduce changes one at a time, with notice.

Consistency across workers. In a service with rotating staff this is the hardest and most important variable. Different workers doing the same thing differently generates conflict by itself.

Offer real choices rather than instructions. “Shower now or after breakfast?” produces cooperation where “time for your shower” produces refusal, and costs nothing.

De-escalate rather than win. Lower your voice, reduce eye contact, give space, stop talking, drop the demand, come back later. Arguments with a person who cannot regulate their emotions have no winner.

Debrief afterwards, briefly or not at all. The person may not remember and may not benefit from being reminded. Record it; do not relitigate it.

When the behaviour is dangerous

Where there is real risk to the person or others, a formal behaviour support plan from a registered specialist behaviour support provider is required, and any restrictive practice carries specific legal obligations. That is covered in behaviour support and restrictive practices.

Medication is sometimes used, and deserves scrutiny. Antipsychotics prescribed for behaviour rather than for a diagnosed psychiatric condition constitute chemical restraint under the NDIS rules, with authorisation and reporting requirements attached. They also commonly cause sedation that worsens cognition and fatigue — and sedation reduces behaviour partly by reducing the person. Where medication is proposed, reasonable questions are: what specifically is it treating, what is the review date, what non-medication strategies were tried, and is this a regulated restrictive practice.

And the justice system

Worth naming, because it is where unaddressed ABI behaviour frequently ends.

A Corrections Victoria study found acquired brain injury in 42% of male prisoners and 33% of female prisoners in Victorian prisons, against roughly 2% in the general population. The pathway is exactly what this guide describes: impaired impulse control, poor social judgment, inability to remember or organise around bail conditions, difficulty explaining oneself under pressure — all invisible, all read as attitude.

Where a person with a brain injury is dealing with police or a court, get the injury onto the record in writing straight away, hand over the neuropsychological report if one exists, and request a disability advocate. It genuinely alters how the matter proceeds, and it is almost never done.

Sexual disinhibition, which nobody writes about

Left out of almost every family resource, and one of the most distressing things families deal with.

Sexual disinhibition after brain injury can include inappropriate comments, touching, undressing in the wrong places, propositioning strangers or support workers, public masturbation, and a loss of the judgment that previously governed any of it. It occurs in a minority of people and it is devastating for everybody around them.

Several things are worth knowing.

It is a frontal lobe symptom, not a revelation of latent character or a moral failure. The drive is usually not increased; the inhibition is decreased.

It is sometimes the opposite problem. Reduced libido and sexual function is considerably more common after brain injury than disinhibition, and is barely ever discussed either. Both deserve raising with a rehabilitation physician.

It needs a plan, not improvisation. This is squarely behaviour support territory, and it needs a written, consistent response that every worker follows: a neutral correction, redirection, and a recorded incident rather than an embarrassed silence or a varied reaction that inadvertently reinforces it.

Workers must be protected. A support worker being propositioned or touched is a workplace health and safety matter, and a provider that has no plan is failing both the worker and the person.

Medication is sometimes used, and where it is used to manage behaviour rather than treat a diagnosed condition it is chemical restraint, with the obligations that follow.

It frequently improves over the first years, particularly with consistent management.

The practical ask: raise it explicitly with the rehabilitation team and the behaviour support practitioner rather than hoping it resolves. Families routinely do not mention it out of shame, and the consequence is that nobody puts a plan in place.

Where the behaviour is actually dangerous

Most of this guide is about reducing everyday conflict. A smaller number of situations involve real risk, and they need a different response.

If there is immediate danger to anybody, that is an emergency. Call 000. Being reluctant to involve police with a person who has a disability is understandable, and a serious assault is still a serious assault — and a documented emergency response is sometimes what finally produces the funding and the specialist support that should have been in place.

Say “acquired brain injury” to the operator and to attending officers, and have the neuropsychological report and behaviour support plan somewhere findable. It changes the response.

Have a written crisis plan before a crisis: the triggers, the early warning signs, what to do, what not to do, who to call in what order, the behaviour support practitioner’s number, and whether there is a safe place for other household members. Agree it with the behaviour support practitioner and give it to every worker.

Know the local mental health crisis line for your state, and know that an ABI presentation may be refused by mental health services on the basis that it is not a mental illness. Where that happens, insist on a medical assessment, because a sudden escalation can be infection, pain, seizure activity or medication.

Protect children in the household. This is uncomfortable and necessary. Where a parent’s behaviour after a brain injury presents a risk to children, that has to be planned for openly rather than managed by hoping.

And know that you may need to stop. Families who cannot safely continue to provide care are not failing. Where the behaviour exceeds what a household can manage, the right answer is specialist accommodation with trained staff, and saying so early produces a better arrangement than waiting for a catastrophe.