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A Level · Cambridge (CIE) · 9990

Hölzel et al. · mindfulness and brain scans

Trace the eight-week mindfulness study from MRI measurements to reported brain changes. Distinguish a controlled longitudinal comparison from proof that meditation alone caused lasting brain change.

Cambridge International AS & A Level Psychology 9990 · 2028–2030 · Version 1 · CORE-03
Exam scope and assessment notes

Original StudyForA teaching mapped to the Cambridge 2028–2030 syllabus. These lessons are independent study support, not Cambridge material, official mark schemes or awarded grades. No lesson reproduces a research article or Cambridge question. Human subject-expert review and full timed-paper grading remain pending. This lesson synthesises the named study from its original article and Cambridge's study outline; it is an original summary, not a reproduction of the paper.

Before you begin

  • This is one of the 12 compulsory AS core studies in the 2028–2030 Version 1 syllabus. Check that your exam entry uses this syllabus year.

Work on paper. Try each question before revealing help, and explain why your method works.

Quick readiness check

Why was a pre–post scan useful?

What you will learn

  • Explain the study aim, sample, procedure and findings
  • Evaluate the method, ethics and evidence
  • Apply the relevant approach and issues/debates without overclaiming

Approach and research focus

Biological approach. The study investigates whether participation in mindfulness-based stress reduction is associated with changes in regional brain grey-matter concentration. MRI provides a biological measure, while self-reports and practice records add participant information.

Background: Earlier comparisons of experienced meditators and non-meditators could not show whether differences preceded meditation. A pre–post design with a comparison group can examine change over time, although allocation and other differences still matter.

Aim and procedure

Sixteen healthy adults who had not meditated before completed an eight-week mindfulness-based stress-reduction programme. A waiting-list comparison group of 17 people was also followed. Researchers took structural MRI scans before and after the programme, collected self-report information and related reported practice to some measured changes. The study therefore used a controlled longitudinal design, brain imaging and correlational analysis; participants were not randomly assigned to an active alternative programme.

Results and conclusion

The researchers reported an increase in grey-matter concentration in the left hippocampus in the mindfulness group relative to controls. Exploratory whole-brain analyses also identified changes in regions including the posterior cingulate cortex, temporo-parietal junction and cerebellum/brainstem. Some analyses related the amount of home practice to change; MRI concentration is a measurement, not a direct measure of improved ability in daily life.

Participation in the eight-week programme was associated with pre–post changes in measured brain regions. The small, non-randomised comparison does not prove that mindfulness alone caused the changes, that every learner’s brain changes, or that a measured concentration difference necessarily means better psychological functioning.

Evaluate the evidence

Pre–post MRI gives a biological measure across time, and the waiting-list group helps compare changes beyond the programme participants’ baseline.

The groups were small and self-selected; a waiting-list comparison does not control for expectations, social contact or other aspects of a structured course.

MRI-based grey-matter concentration is indirect and depends on image processing; it should not be described as a simple count of new brain cells.

Home-practice records and correlations cannot show that practice time caused a regional change, and the study does not establish long-term effects.

Ethics and issues/debates

MRI requires safety screening and informed consent; an eight-week course also requires consideration of participants’ time and wellbeing.

The paper describes a healthy adult sample. Do not generalise the findings as treatment advice or assume participants with a clinical condition were studied.

The biological approach links a psychological programme to brain measures, while the intervention itself is a learned practice and may involve social and expectancy effects.

Localisation identifies regions with measured changes; it does not show that a complex skill or emotion belongs to one brain region alone.

Application to everyday life should stay within the tested programme, sample and measurement period.

Sources for this lesson

Pause and explain

Why is the waiting-list group not the same as an active control?

Put the idea to work

Worked example

A wellness advert says, ‘Mindfulness grows the hippocampus and improves everyone’s memory.’ Assess this claim.

Show the worked solution
  1. The study measured MRI grey-matter concentration before and after an eight-week course.
  2. The sample contained 16 programme participants and a 17-person waiting-list comparison, not a representative sample of all learners.
  3. A regional MRI change does not itself prove improved memory or a universal, permanent effect.

Answer The study reported a left-hippocampal MRI change associated with the programme, but it did not prove universal memory improvement or lasting growth in every person.

Try a topic test

Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.

Test this topic →

From guided practice to a new situation

Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.

1 · Guided

Sixteen programme participants and 17 waiting-list participants had MRI scans before and after eight weeks. State one method strength and one limitation.

Give me a hint

Use the repeated scans for the strength; inspect how people entered their groups for a limitation.

Compare my reasoning
  1. Pre–post MRI measures change in the same participant over time.
  2. The waiting-list group provides a comparison to some changes occurring over the same period.
  3. Small, self-selected groups and no active control leave expectations and other course effects as alternatives.

The longitudinal scans and comparison group strengthen the change analysis, but small self-selected groups and the waiting-list design leave confounds.

Look for these in your work

  • Repeated measurement explained
  • Control group role described
  • Allocation limitation stated
2 · Independent

Explain why a correlation between home practice and MRI change would not establish that practice caused the change.

Give me a hint

Name one possible third variable and distinguish amount of practice from assigned condition.

Compare my reasoning
  1. Practice time was reported rather than randomly assigned.
  2. Motivation or course attendance could affect both practice time and other experiences.
  3. A correlation shows that two measured changes vary together; it does not rule out these alternatives.

The correlation is compatible with a practice effect, but motivation, attendance or other factors could contribute; it is not causal proof.

Look for these in your work

  • Correlation identified
  • Third variable proposed
  • Causal wording avoided
3 · Transfer

Plan a stronger follow-up testing a mindfulness programme’s effect on attention while retaining a brain measure.

Give me a hint

Randomly assign where feasible, match course contact and measure both brain and behavioural outcomes.

Compare my reasoning
  1. Randomly assign consenting, eligible adults to mindfulness training or a time- and contact-matched comparison programme.
  2. Use the same pre-registered attention task and MRI protocol before and after the same study period.
  3. Blind image analysts to group where possible, record practice, and report both behavioural and imaging results without treating one as proof of the other.

A randomized active-control study with blinded MRI analysis and a behavioural attention measure would better separate programme effects from expectations and contact.

Look for these in your work

  • Groups comparable
  • Brain and behaviour both measured
  • Analysis safeguards specified

Common mistakes

  • Calling grey-matter concentration a count of new neurons
  • Ignoring the waiting-list control or the small sample
  • Treating a correlation with practice time as proof of cause
  • Inferring better memory from MRI without a memory outcome
Recall without your notes

What can you explain now?

What did the MRI directly measure in this study?

Compare with the explanation

Regional grey-matter concentration before and after the programme

An MRI measure does not itself establish a functional improvement.

After trying it yourself, choose your next review. This is your self-assessment.

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Make it stick

Name the aim, the best-evidenced result and one methodological limitation of Hölzel et al..

If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.

Keep learning Psychology

Course scope and assessment

Seven original lessons map all 15 AS research-method and methodological-concept sections to explained Guided, Independent and Transfer practice. All 12 compulsory AS core studies have original study-specific teaching and staged practice; five additional A Level methodology lessons cover research design and validity. All 15 Clinical, all 15 Consumer (2.1.1–2.5.3) and all 15 Health (3.1.1–3.5.3) Psychology sections link to original teaching and staged practice. All 15 Organisational Psychology sections 4.1–4.5 now have original teaching and explained staged practice; the six new 4.4–4.5 lessons bring the planning map to 92 of 92 indexed sections. Consumer lessons cover physical and psychological environments; decision models, heuristics and mistakes; packaging, selling and buying; advertising, self-monitoring, product placement, brand recognition and slogans. Evaluation boundaries are explicit: studies use particular products, samples, tasks and settings; gaze, recall, self-report, EEG indices, ratings, choices and purchases are different outcomes. Health evidence is bounded: Laba et al. measured hypothetical preferences; Riekert and Drotar raise a non-response concern; Chung and Naya's cap tracked openings, not swallowing; Chaney et al. was a short caregiver-reported pilot; Yokley and Glenwick examined immunisation attendance in one public-health setting. MacLachlan et al. report one patient, not a controlled treatment effect; Brudvik et al. compared separate child, parent and physician ratings in one emergency department. Chandola et al. found a cohort association; Wang et al. measured responses during a monitored arithmetic task; Evans and Wener observed commuters; Bridge et al. found mixed self-rated outcomes in radiotherapy. Janis and Feshbach measured short-term self-reports in one school; Lewin et al. tested a rehabilitation package, not information alone. Tapper et al. and Fox et al. studied bounded school and worksite programmes; incentive effects do not establish transfer or rule out reporting effects. Weinstein measured comparative expectations, while Seligman’s framework is conceptual and Shoshani and Steinmetz used a school-level comparison. These findings do not establish universal health effects or diagnose individuals. Need-theory examples use a child measurement study, not a workplace test; SMART is a practical checklist, not a motivational theory. Landry et al. compared reward framing with student volunteers in a lab; this does not establish universal effects in workplaces. Cuadrado et al. (2008) measured undergraduate evaluations of presented leaders, not workplace performance or hiring; this does not establish a universal gender effect. The historical 1995 Munchausen criteria are not a current diagnostic checklist. Cambridge’s 2028–2030 Reference List treats Oruč et al. (1997) as an example of genetic explanation although its participants had bipolar I; gambling disorder is listed in Cambridge’s Clinical topic but classified under addictive behaviours in ICD-11. Candidates choose two options, but all four remain listed so schools can select a route. The 92-section count is a planning index, not a Cambridge score. Remaining work is deeper coverage review, separate-year syllabus reconciliation, timed-paper practice and human subject-expert review. The separate 2027 and 2024–2026 syllabuses are not reconciled into this route. Practice is not official grading, a timed-paper simulation or human subject-expert review.

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