Improve health through communication and information
Compare fear arousal with supportive information, evaluate Janis and Feshbach and Lewin et al., and distinguish message effects from lasting health outcomes.
Original StudyForA teaching mapped to Cambridge 9990 Health Psychology sections 3.5.1–3.5.3, 2028–2030 Version 1. Example studies illustrate the syllabus and are not official Cambridge materials or mark schemes. This is psychology education, not medical or mental-health advice.
Before you begin
- This lesson covers Cambridge Psychology 9990 Health Psychology section 3.5.1. Message exposure, knowledge, reported practice and longer-term health are separate outcomes.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What did Janis and Feshbach (1953) report about the dental-hygiene messages?
What you will learn
- Fear arousal to improve health; Janis and Feshbach (1953)
- Providing health information; Lewin et al. (1992)
Health messages can influence different steps in behaviour
Health promotion aims to support healthier decisions or behaviour. A message may attract attention, change knowledge or beliefs, strengthen intention, prompt an action, or help maintain a behaviour. These are separate outcomes. Learning information does not guarantee that someone can act on it; practical access, social support and the surrounding situation may also matter.
A fear-arousing communication presents a threat in order to motivate a protective action. Its effect depends on more than fear intensity: the message must make the recommended action understandable and feasible. Strong threat without a credible action can cause avoidance, distress or distrust. A campaign should be accurate, proportionate and non-stigmatising rather than using fear as a guarantee of change.
Providing information explains a health issue and possible action. It can improve understanding, but information alone may not change behaviour when people face barriers, need rehabilitation or lack support. A useful evaluation separates the message content from the broader programme and checks what was actually measured.
Janis and Feshbach (1953) compared three fear levels about dental hygiene
Janis and Feshbach gave three groups of 50 high-school freshmen a 15-minute illustrated dental-hygiene communication designed to produce strong, moderate or minimal fear. A fourth group of 50 received an unrelated control communication. The researchers measured knowledge and reported dental-hygiene beliefs and practices before, immediately after and one week after the communication.
The strong message produced the greatest immediate worry. The groups learned factual information similarly, but the minimal-fear group showed the greatest increase in reported conformity to recommended toothbrushing practices: 50% increased, compared with 44% in the moderate group, 28% in the strong group and 22% in control. These are short-term self-reports from one school context, not direct observations of brushing or evidence of lasting dental-health outcomes.
The study challenges the idea that increasing fear always improves a message. It supports comparing message intensity, but it does not establish that low fear is best for every campaign. The sample, historical communication and specific dental recommendations limit generalisation; later fear-appeal research has reported mixed findings. The study also raises ethical questions about frightening adolescents and about how threat and reassurance are balanced.
Lewin et al. (1992) evaluated a self-help rehabilitation package after a heart attack
Lewin and colleagues randomly allocated 176 patients recovering from an acute myocardial infarction to a home-based self-help rehabilitation programme built around a heart manual, or to standard care plus an information placebo package and informal counselling. The programme therefore tested structured rehabilitation information and support in a particular clinical context, not an isolated leaflet for the general public.
At one year, psychological adjustment measured with the Hospital Anxiety and Depression Scale was better in the rehabilitation group. Participants also had fewer general-practitioner contacts during the next year and fewer hospital readmissions in the first six months; improvement was greatest among patients who were clinically anxious or depressed at discharge. The outcome measures and follow-up periods should be stated separately.
Random allocation strengthens comparison between groups, and the follow-up considers more than immediate knowledge. However, the intervention was a package, so the manual’s information cannot be isolated from its other elements. The participants were post-heart-attack patients receiving care; findings should not be treated as proof that a leaflet alone improves everyone’s health or as a substitute for clinical rehabilitation.
Evaluate the message, audience and setting together
A situational explanation asks whether the communication, access to the recommended action or available support makes change easier. An individual explanation considers a person’s understanding, concerns and circumstances. Cultural differences can affect how a threat or recommendation is interpreted, so translation alone may not make a message suitable.
A stronger evaluation could measure comprehension, intention and observed or reliably recorded behaviour at more than one follow-up point, alongside a suitable comparison group. Self-reports can reveal private choices but may be affected by recall or social desirability; objective records can count an action but may miss its meaning or context. Ethical research should avoid unnecessary fear and protect participants’ privacy.
Sources for this lesson
- Cambridge International AS & A Level Psychology 9990 syllabus, 2028–2030
- Cambridge International AS & A Level Psychology 9990 Reference List, 2028–2030
- Janis and Feshbach (1953), Effects of fear-arousing communications
- Lewin et al. (1992), Effects of self-help post-myocardial-infarction rehabilitation
Pause and explain
Why should Lewin et al. (1992) not be described as a simple leaflet-only test?
Worked example
A poster says that Janis and Feshbach proved frightening health campaigns never work. Rewrite the claim and identify useful evidence for a follow-up.
Show the worked solution
- State the study’s population, topic and comparison rather than making a universal claim.
- Report the observed short-term self-report pattern and the limits of that outcome.
- Propose a follow-up that measures a feasible action over time without unnecessarily frightening participants.
Answer Janis and Feshbach found that, in one school’s dental-hygiene communication, the minimal-fear group reported the greatest short-term increase in conformity; the strong-fear group reported the least. The study does not show that every fear appeal fails or that reported practice equals lasting health. A follow-up could compare accurate, proportionate messages and measure understanding and behaviour at more than one time point with consent and a suitable comparison.
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.
A report shows that participants could recall a health message immediately after viewing it. What can this result establish, and what further outcomes are needed?
Give me a hint
Recall is a knowledge outcome. Separate intention, action and longer-term health outcomes.
Compare my reasoning
- The result can show immediate recall under the study’s conditions.
- It does not by itself show that participants changed a behaviour or maintained it.
- A follow-up could measure a clearly defined action and its timing, with a suitable baseline or comparison.
- A health outcome may require a longer, ethically designed study and appropriate interpretation.
The result supports an immediate knowledge or recall claim for that sample. It cannot establish behaviour change or improved health. A follow-up should measure a defined action and, where relevant, health outcomes over an appropriate period while considering access and other influences.
Look for these in your work
- Exact outcome stated
- Recall separated from behaviour
- Relevant follow-up proposed
Evaluate the claim that a stronger fear message would improve Janis and Feshbach’s dental-hygiene outcome.
Give me a hint
Use the group pattern, distinguish reported practice from observed action and note the short follow-up.
Compare my reasoning
- The strong message produced greater immediate worry, but similar factual learning across message groups.
- The minimal-fear group had the greatest reported conformity increase (50%); the strong-fear group reported 28% and control 22%.
- The practice data were self-reports one week later in one school, not observed brushing or long-term oral health.
- The result challenges a simple ‘more fear is better’ claim but does not prove that minimal fear works best in every context.
The study does not support the claim that stronger fear improved the measured practice outcome: the strong-fear group reported less increased conformity than the minimal-fear group. The result is bounded by one adolescent school sample, self-reported behaviour and a short follow-up, so it does not establish a universal message rule.
Look for these in your work
- Results compared accurately
- Outcome limit identified
- Conclusion is appropriately bounded
Design a follow-up to Lewin et al. that tests whether health information helps people act on a recommendation. State one ethical safeguard and one causal limitation.
Give me a hint
Define the action and compare a clear information intervention with appropriate usual support.
Compare my reasoning
- Choose a specific, safe and feasible recommendation and measure understanding separately from the action taken.
- Compare a structured information package with an appropriate usual-support condition and follow up at planned intervals.
- Obtain informed consent, protect health information and do not withhold essential care or support.
- If the package includes several elements or allocation is not random, the information’s independent effect remains uncertain.
A follow-up could compare structured information plus usual care with usual care alone, measure comprehension and a defined action separately, and follow participants at planned intervals. Essential care should not be withheld and health data must remain confidential. If the intervention also includes support or reminders, its separate information effect cannot be identified without further design controls.
Look for these in your work
- Intervention and outcomes defined
- Ethical safeguard included
- Causal limitation explained
Common mistakes
- Assuming stronger fear always creates stronger or longer-lasting behaviour change
- Treating Janis and Feshbach’s self-reported practices as observed behaviour or health outcomes
- Calling Lewin et al. a test of information alone when the programme included rehabilitation support
- Generalising a post-heart-attack programme to every audience or health decision
- Ignoring cultural interpretation, access, longitudinal outcomes and message ethics
What can you explain now?
What is the difference between learning a health message and improving health behaviour?
Compare with the explanation
Learning concerns understanding or recall; behaviour concerns what a person does, and health outcomes may require still longer follow-up. Knowledge alone does not remove practical or social barriers.
State the exact outcome and time point before making a claim about effectiveness.
After trying it yourself, choose your next review. This is your self-assessment.
Your review choice appears on Today. Sign in to sync it across devices.
Make it stick
Compare fear arousal and health information using one finding from Janis and Feshbach or Lewin et al., then distinguish what was measured from what was not.
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.