Amir Khesro

What Is Neuropsychology?

Conversations in a busy room left me exhausted. Words I had used my whole life sometimes refused to come when I reached for them. My brain would understand something perfectly well at the time, and yet a few days later there would be nothing there, as though it had never been stored at all. My mood, too, was lower than I expected. None of this showed up anywhere on a scan, and for a while that made it harder to explain, even to myself.

I now know this is a common experience. The results arrive, everyone tells you that everything is fine, and yet you are the only one who knows that it is not. Living with that gap, between what the scan says and what you actually feel, can be one of the loneliest parts of recovery.

I eventually shared this with my specialist nurse. During a routine check in, I told her that my mood had been low and that my memory did not feel like my own anymore. Rather than treating this as separate from my recovery, she referred me for a neuropsychological assessment. That conversation was the beginning of my understanding of what neuropsychology actually is.

This piece sets out what neuropsychology is, why it matters for anyone living with an acoustic neuroma, and what an assessment actually involves.

In Brief

For readers who want the essentials before the detail:

Defining the Term

Neuropsychology sits at the junction of the brain and behaviour. Rather than asking only whether a structure looks normal on a scan, it asks how a person actually thinks, remembers, concentrates and functions in everyday life.

Put simply, it examines how the brain supports thinking, behaviour and emotional wellbeing, and how these can be affected by neurological illness, injury or treatment.

A clinical neuropsychologist does not report your scans. That is the radiologist's role. They will, however, read the radiology report and take it into account alongside everything else, because the question they are answering is a different one. Not what your brain looks like, but how it is functioning. This might involve questions such as these:

A scan cannot answer these questions. It tells your medical team about structure. Neuropsychological assessment tells you something different: how you are functioning, day to day.

What Neuropsychology Cannot Tell You

Before going further, it is worth being clear about the limits of this field, since patient information can otherwise feel as though it is overselling itself.

A neuropsychologist cannot tell you from cognitive testing whether your tumour is growing. They do not replace MRI surveillance, and they do not decide whether surgery, radiotherapy or watchful waiting is the right course for your tumour. They cannot prove that every symptom you experience has been caused by the tumour itself, and an assessment will not explain every symptom you have.

What neuropsychology offers instead is a different, complementary picture: not what your brain looks like, but how it is working for you right now. A scan and a neuropsychological assessment are not two ways of measuring the same thing. They answer different questions, and both matter.

Why This Matters for Acoustic Neuroma Patients

An acoustic neuroma, more accurately called a vestibular schwannoma, is a usually benign tumour arising from the vestibular portion of the eighth cranial nerve, which carries balance information from the inner ear to the brain.

The link between the tumour and symptoms like memory difficulty, low mood and slow thinking is rarely direct. It usually runs through several connected pathways rather than one single mechanism. When the balance signals reaching the brain become unreliable, the brain has to work harder, almost constantly, just to keep you upright and oriented, and that leaves less capacity available for concentration and for properly registering new information, which is one reason things can feel understood in the moment and then simply absent the next day. Hearing loss adds a similar cost, since following speech, especially in a noisy room, takes real mental effort when it relies on one working ear, and I have written elsewhere on this site about that effort specifically, in The Cocktail Party Effect and Life With One Ear. On top of this, living with tinnitus, dizziness, an uncertain diagnosis, and the disruption to sleep that often comes with all of it, carries a genuine emotional weight, and low mood in this context is a reasonable response to a difficult set of circumstances rather than something separate from the illness.

Two People, Two Different Experiences

Consider two people with a similarly sized acoustic neuroma, both with normal follow up scans a year after treatment.

The first finds that concentration is largely back to normal, though she notices she tires more quickly by late afternoon and prefers quieter rooms for important conversations. The second feels that his memory has become unreliable, struggles to follow meetings at work, and has begun to worry that something is being missed on his scans.

Both experiences are real. Neither is more valid than the other, and neither can be judged from the scan alone. The second person's memory concerns might, on closer assessment, turn out to reflect difficulty sustaining attention in noisy meetings rather than a true memory problem. Information was never properly taken in in the first place, so there is less available to recall later. This is precisely the kind of distinction a neuropsychological assessment is designed to untangle.

Fatigue Is Often the Biggest Factor

Fatigue is an important contributor to concentration and memory difficulties in vestibular schwannoma. I have written a separate post on fatigue in acoustic neuroma covering what it is, why it happens and how to manage it, so I will simply add the research angle here. One study found that 57 percent of patients met the criteria for significant fatigue, compared with 25 percent of a control group, and fatigue was linked to low mood, anxiety, sleepiness and apathy. This matters for assessment because fatigue affects cognitive performance directly, which is why a good assessment looks closely at the conditions under which difficulties appear, rather than relying on a single test score taken on a single day.

What Else Can Affect Your Thinking

Two further factors are worth naming directly, since both are common and both are genuinely treatable.

If you are on watch and wait, with interval scans rather than immediate treatment, anxiety around each upcoming scan, and the days spent waiting for results, is an extremely common experience. It is a well recognised cause of poor concentration and disturbed sleep in its own right, and it is not a sign of weakness. It responds well to support, whether through your own coping strategies, psychological therapy, or simply naming it to your team.

Medication can also play a part. Some medicines can affect alertness, processing speed or memory in some people. These can include vestibular sedatives and medicines sometimes prescribed for tinnitus related insomnia, nerve pain or anxiety, such as certain sleeping tablets, amitriptyline, gabapentin and pregabalin. It is worth taking a full list of your current medications to any assessment and discussing it with your prescriber, rather than changing or stopping anything on your own.

Can Surgery or Radiotherapy Affect Thinking?

Treatment is part of the picture, but it should not be oversimplified. Major surgery can be followed by a period of fatigue, reduced concentration and mental fog, and recovery is rarely a straight line. Cognitive and emotional recovery often do not follow the same timetable as physical healing.

Surgery can also affect the facial nerve, and changes such as facial weakness, difficulty closing the eye fully, or an altered smile can have a real effect on mood, confidence and how comfortable someone feels in social situations. This is often left out of discussions about thinking and memory, yet it belongs firmly in the same conversation. Psychological support for this kind of appearance related distress is a recognised and effective area of work, and it is worth asking about directly if this affects you.

It would be misleading to assume that lasting cognitive impairment is an inevitable outcome of surgery, or that everyone who receives radiotherapy will develop cognitive problems. The effects of treatment vary considerably between individuals and depend on health, symptoms before treatment, age, fatigue, hearing, vestibular function and psychological wellbeing, among other factors. If cognitive difficulties appear after treatment, the sensible approach is to have them properly assessed rather than simply assumed to be the treatment's doing.

If treatment is still ahead of you, it is worth knowing that a baseline assessment before surgery or radiotherapy can make any later comparison far more meaningful. Without one, it can be genuinely difficult for anyone, including you, to say with confidence whether your thinking has changed. If this feels relevant, it is worth raising with your consultant before treatment begins.

What Does an Assessment Actually Involve?

A neuropsychological assessment typically combines a clinical interview, standardised cognitive tasks and relevant questionnaires. The precise content varies by individual, but areas commonly assessed include attention and concentration, processing speed, learning and memory, working memory, meaning the ability to hold information in mind while using it, such as keeping a phone number in your head while you look for a pen, executive functions such as planning, organising and problem solving, language, visuospatial ability, meaning how you perceive and work with things in space, such as reading a map, reasoning, emotional functioning, and the impact of fatigue on everyday life.

Some tasks look deceptively simple, such as recalling a list of words, reproducing a pattern, or switching between rules partway through a task. They are carefully standardised, so your performance can be compared with appropriate reference data, but the scores are only part of the picture. A neuropsychologist also considers your medical history, education, hearing, vision, sleep, mood and medications, alongside the difficulties you describe in daily life.

This context matters particularly for acoustic neuroma. If you have hearing loss on one side, it is worth telling the service in advance. You can ask for a quiet room, for the assessor to sit on your better side, and for instructions to be repeated or given in writing, and you should bring and use your hearing aid or other device throughout. Say so at the time if you have not heard something clearly. This is not cheating, and it does not invalidate your results. A test given in conditions where you cannot hear it properly is not measuring your memory.

A few practical points are worth knowing before your appointment. Assessments are usually spread across one or more sessions rather than rushed into a single sitting, and you can ask for breaks if you become tired, since an assessment of fatigue that made no allowance for fatigue would rather defeat its own purpose. You are usually welcome to bring someone with you for support. You should receive a written report explaining the findings, and it is entirely reasonable to ask in advance who else will see it and whether it becomes part of your medical record, as well as whether it could have any implications for your work, your driving licence or your insurance.

The process itself usually unfolds over several stages:

Your Own Baseline Matters

Test results are usually compared with a large reference group of people of similar age and education. This kind of comparison is useful, but it has an important limitation. It cannot see where you personally started from.

Someone who previously worked at a high level might score comfortably within the normal range on testing while having genuinely declined from their own earlier ability, and their sense that something has changed is entirely real even though every individual score looks unremarkable. Equally, a score that falls below the general population average might simply reflect how that person has always performed, rather than any change at all.

This is often the missing piece when someone is told their results are normal and still feels, quite rightly, that something is different. A good neuropsychological assessment tries to take your own starting point into account, not only the general population average, and it is one of the more reassuring things to understand before you go in.

Who Might Benefit From an Assessment

Assessment may be worth considering if you have persistent concerns about thinking that are genuinely affecting your daily life. This could include ongoing problems with concentration or memory, difficulty returning to work or previous responsibilities, significant mental fatigue, difficulties others around you have noticed, or simple uncertainty about whether your symptoms relate to cognition, mood, hearing or some combination of these. Not everyone with an acoustic neuroma needs this kind of assessment, and the decision should reflect your own circumstances rather than a general rule.

What Happens After the Assessment

The assessment should lead to something practical. If attention is affected, reducing distractions and working on one task at a time may help. If processing speed is reduced, allowing extra time to take in information can make a real difference. If memory is a concern, written reminders, calendars and consistent routines can reduce how much needs to be held in mind. If fatigue is the main issue, pacing demanding activities and building in proper rest often works better than pushing through exhaustion.

For many people with acoustic neuroma, some of the most effective recommendations are not really about memory techniques at all, but about reducing the sheer effort of hearing and staying balanced, a theme I have covered from the patient side in The Cocktail Party Effect and Life With One Ear. From the assessment side, this can include optimising hearing with hearing aids or a CROS or BiCROS system, assistive listening technology such as a remote microphone in meetings, vestibular rehabilitation, and treating tinnitus related insomnia through cognitive behavioural therapy for insomnia. Reducing how much effort it takes to hear and stay oriented often does more for concentration than any memory technique on its own.

At work, this might translate into adjusted meeting formats, written rather than purely verbal instructions, fewer interruptions, extra processing time, or changes to workload and scheduling. Recommendations should always be individual. Not everyone with an acoustic neuroma has the same difficulties, and generic advice rarely fits everyone equally well.

Accessing Neuropsychology in the UK

Access to clinical neuropsychology varies across the NHS, and referral routes differ depending on where you live. Your consultant or GP is generally the right place to start, and it is entirely reasonable to ask directly whether neuropsychological assessment is available, or whether another service would be more appropriate for your situation.

If you are considering a private assessment, it helps to know that the title neuropsychologist is not itself protected in the UK. The titles practitioner psychologist, clinical psychologist and educational psychologist are protected, and anyone using them must be registered with the Health and Care Professions Council, whose register is public and free to search. It is also worth checking whether the practitioner appears on the British Psychological Society Specialist Register of Clinical Neuropsychologists, which is the recognised UK marker of post qualification specialist training in this particular field, and asking directly about their experience with hearing loss, vestibular disorders and skull base surgery, since test selection and delivery often need adapting for this group.

It is also worth knowing about the British Acoustic Neuroma Association, a UK charity supporting people affected by acoustic neuroma and their families. They offer a helpline, an online forum, and local and virtual support groups where many people find it helpful to hear how others have managed similar cognitive and emotional changes, even outside a formal clinical assessment.

When to Speak to Your Medical Team

Cognitive symptoms should never simply be assumed to be part of your acoustic neuroma without discussion. Persistent problems with memory, concentration, balance, hearing, sleep or mood deserve a proper conversation if they are affecting your quality of life, and your team may draw on audiology, vestibular rehabilitation, occupational therapy, psychological support or neuropsychology, depending on what fits your situation. If you notice new or worsening symptoms, contact your medical team without delay rather than waiting to see whether they settle.

What This Means for You

Living with an acoustic neuroma can involve far more than the tumour itself. Hearing loss, tinnitus, balance difficulties, fatigue, disrupted sleep, surveillance anxiety and the emotional weight of recovery, including how surgery may have changed your face or your confidence, can all shape how a person functions. Some people also experience measurable cognitive changes alongside all of this.

This is why your own experience matters, even when your scan looks entirely reassuring, and even when your test results fall within the normal range. A scan tells your medical team about structure. A neuropsychological assessment asks a different question: how is your brain functioning, for you, in the context of your own life, your own history and your own recovery.