IB Psychology HLTopic 8 — Health & WellbeingPaper 3 (HL)Key study~11 min read
What Technology Does to Mental Health
Some fears cannot be practised in real life. You cannot fly a veteran back to a war zone, and you cannot hire a plane crash for someone terrified of flying. Virtual reality exposure therapy solves that problem — and it gives you a case study that is perfect for showing an examiner you can evaluate evidence.
📚 What you need to know
VRET (virtual reality exposure therapy) uses VR to build a simulated environment where a patient can face a feared situation safely.
It works on the principle of exposure: fear that is faced and not followed by harm gradually fades. That fading is called habituation.
Rothbaum et al. (1999) treated a Vietnam veteran with PTSD and major depressive disorder using VRET.
Fourteen sessions of about 90 minutes, twice a week over roughly seven weeks.
PTSD symptoms improved, the improvement held at 3-month and 6-month follow-ups, and his depression dropped from severe to moderate.
It is a single case study: deep and detailed, but with no control group and almost no basis for generalisation.
The 15-mark question here is usually about whether tailor-made treatments like this should be made widely available — which is as much about cost as about psychology.
What VRET is, and why it works
VRET puts a patient inside a computer-generated version of the thing they fear — a combat zone, an aeroplane cabin, a crowded lift — while a therapist sits with them and controls what happens. The patient knows it is not real, but the body reacts as if it might be: heart rate climbs, breathing goes shallow, the urge to escape appears.
That reaction is the point. Avoidance is what keeps a fear alive. Every time you escape a feared situation, you never find out that nothing bad happens, so the fear stays intact. Exposure breaks the loop by staying in the situation long enough for the anxiety to come down on its own.
The exposure principle
face the fear → anxiety rises → nothing bad happens → anxiety falls → the brain updates its prediction
The shape is what matters, not the numbers — anxiety must be allowed to fall before the session ends, or the fear is reinforced instead.
Say “habituation” in the exam and explain it in one clean sentence: the anxiety response fades because the feared outcome keeps not happening. That single sentence separates a description of VRET from an explanation of it.
What VR adds that ordinary exposure cannot
Access. Some feared environments cannot be recreated in real life, for practical or ethical reasons.
Control. The therapist can dial the intensity up or down instantly — add helicopter noise, remove it.
Safety. The patient can stop at any moment, which makes them more willing to start.
Repeatability. The same scene can be run again and again, which imaginal exposure cannot guarantee.
The key study: Rothbaum et al. (1999)
🔬 VRET for combat-related PTSD
Aim: to investigate whether virtual reality exposure therapy could be used to treat post-traumatic stress disorder in a combat veteran, in a controlled treatment case study.
Participant: one man, aged 50, a US helicopter pilot who had served in Vietnam 26 years earlier. He had been diagnosed with PTSD and with major depressive disorder.
Procedure: fourteen individual sessions of roughly 90 minutes, conducted twice a week across about seven weeks, using virtual environments based on Vietnam. Standardised measures of symptoms were taken throughout.
Results:
PTSD symptoms improved substantially across the treatment period.
Follow-up assessments at 3 months and 6 months showed the gains had been maintained.
His depression moved from severe to moderate, and his anger score fell, showing improvement in negative emotion more broadly.
Conclusion: VRET appears to reduce symptoms of PTSD and depression in combat veterans, and the improvement is not just a short-term effect of being in treatment.
Strengths you can use
Rich, detailed data about a real patient with a real disorder.
A standardised procedure — unusual for a case study, and it makes the method repeatable with other patients.
Follow-ups at 3 and 6 months, so the effect is not just measured on the last day of treatment.
Improvement across two disorders at once, suggesting a broad effect on negative emotion.
Limitations you can use
One participant. Nothing here generalises safely to a population.
No control group, so improvement over time or therapist attention could explain the result.
Demand characteristics: a patient in a novel, expensive treatment may report feeling better.
The technology is from 1999 — today’s headsets create a very different experience.
The clever evaluation move: separate the findings (hard to generalise) from the procedure (easy to repeat).
A fair defence of the case study. Combat veterans with PTSD share unusually similar experiences and symptoms, so a finding from one of them is more transferable than a finding from one randomly chosen person. Say that, and then say why it still is not proof.
The bigger argument: should treatments like this be for everyone?
This is where the 15-mark question lives, and it is not really a question about VR headsets. It is a question about scarce resources.
Reason to expand it
Reason to be cautious
Evidence of real, lasting symptom reduction
Evidence comes from very small samples
Reaches fears that cannot be practised in real life
Equipment and trained therapists are expensive
Patients can stop instantly, so drop-out may be lower
Training therapists properly takes time and money
Could be delivered remotely to rural patients
Not everyone can tolerate a headset, and some feel sick using one
Tailoring costs more than a standard group programme
Whenever an exam question asks whether a treatment should be “widely available”, the strongest answers talk about opportunity cost: money spent on one intensive treatment is money not spent on many cheaper ones. That is a judgement, and judgement is what the top band asks for.
Worked examples
WORKED EXAMPLE
To what extent can we conclude that tailor-made treatments such as VRET should be made widely available? [15 marks] — two paragraphs from a longer answer
Paragraph arguing for
The case study gives genuine support for VRET. The participant had lived with PTSD for over two decades, so spontaneous recovery during a seven-week period is unlikely, and the improvement was still there six months later. The mechanism is also well understood rather than mysterious: exposure allows habituation, and virtual reality simply supplies an environment that could not be recreated any other way. If the effect holds for other patients, the argument for widening access is strong, because untreated PTSD carries enormous costs for the person, their family and the health system.
Paragraph arguing against
The evidence base, however, is one man. There was no control group, so improvement could reflect the attention of a therapist across fourteen sessions rather than the virtual reality itself. Cost is the harder problem: headsets, software and trained clinicians are expensive, and a health service that funds VRET for a few patients may be taking that money from services used by many. Tailor-made treatment is by definition the opposite of a treatment that scales cheaply.
Judgement
The reasonable conclusion is a conditional one: VRET should be widened for the specific conditions where the evidence is strongest and ordinary exposure is impossible, rather than offered as a general mental health treatment. Larger controlled trials, not more single cases, are what would justify going further.
WORKED EXAMPLE
Explain one limitation of the method used in this source. [3 marks]
Point
The study is a case study with no control group.
Explain
Because nothing is being compared, there is no way to know whether the improvement was caused by the virtual reality, by the therapist’s attention across fourteen sessions, or by the simple passage of time.
Link
This means a cause-and-effect claim about VRET cannot be made from this source alone, however encouraging the result looks.
💡 Exam tip
Explain the mechanism, not just the machine. Exposure and habituation are what heal; VR is the delivery method.
Use the follow-up data. The 3-month and 6-month checks are the strongest part of this study — say so.
Separate findings from procedure when you evaluate generalisability. It is the sharpest point you can make about a case study.
Bring cost into 15-mark answers. “Should it be widely available” is a resources question as much as a psychology one.
Do not oversell the numbers. One participant is one participant, no matter how good the result looks.
Have a second example ready — VRET for phobias such as flying or heights — so you are not stuck with a single illustration.
⚠ Common mix-up
Thinking VR does the therapy. The therapy is exposure. VR is scenery.
Calling it an experiment. There is no IV manipulated between groups here — it is a controlled case study.
Saying “it can’t be generalised” and stopping. Explain why, and then say what part might still transfer.
Forgetting the depression result. The MDD and anger improvements matter, because they suggest a wider emotional effect.
Assuming ending a session early is harmless. If a patient escapes at peak anxiety, exposure can strengthen the fear rather than weaken it.
Treating “tailor-made” as automatically better. It is better for the individual and worse for the budget. Both are true.
Up next: Does Virtual Reality Therapy Work? — the same treatment, but this time you have to read the evidence off a graph, which is where 3-mark questions are won and lost.
Want this explained one-to-one?
Book a free session with an experienced IB Psychology tutor and get your trickiest topics made simple.
