Health Psychology Flashcards
1: Predicting Health Behaviour
Learning Objectives
- Describe the key features and benefits of social cognitive approaches to predicting health behaviour
- Describe in detail social cognition models of predicting health behaviour and their application to health behaviour, with examples
- Be able to critically evaluate, and compare and contrast, different social cognition models of health behaviour (e.g., strengths and weaknesses)
For the exam: Understand the models and use examples from the reading
1: Predicting Health Behaviour
What are cognitions in the context of health behaviour?
Cognition represent our beliefs, attitudes and knowledge towards a health behaviour. They are:
- intrinsic to us
- vary between individuals
- modifiable determinants of behaviour
- give rise to social behaviour i.e. activities that promote health and prevent disease (exercise, diet, screening) or promote health and well-being (going to doctors, taking medication). These behaviours impact morbidity and mortality
1: Predicting Health Behaviour
What are Social Cognition Models?
Describe key cognitions and their interrelationships in the regulation of health behaviour
SCM…
- explain how key cognitions give rise to social (health) behaviours - how they CAUSE behaviour.
- predict WHO performs health behaviours (understanding of individual differences)
- indicate cognitive targets to intervention (help to CHANGE health behaviours)
1: Predicting Health Behaviour
Continuum vs Stage Theories
Continuum - suggests people are more likely to perform behaviour based on their position on a continuum e.g. HBM and TPB
Stage - suggests people move through different ‘stages’ toward behaviour e.g. TTM, HAPA
1: Predicting Health Behaviour
Health Belief Model
Continuum theory - people are likely to perform a behaviour based on their position on a continuum
- Lists variables that have been found to predict behaviour rather than being set out as a formal model
- Individual representation of health behaviour in relation to an illness threat can be divided into:
1) Perceptions of illness threat (perceived susceptibility & severity of illness consequences) and
2) Evaluations of behaviour to counteract the threat (benefits and costs of alternative actions) - Cues to action and motivational factors added later
- Demographic variables and psychological characteristics feed in
e.g. in order for someone to act they must perceive that they are ill, evaluate that illness as serious, and think it is better to act than to not act
1: Predicting Health Behaviour
Health Belief Model: Summary
- Widely used, common sense model
- Useful framework for investigating health behaviours
- Core beliefs are predictive of behaviour (See reviews by Janz & Becker, 1984; Harrison et al., 1992)
- Small effect sizes
- Cross-sectional studies
- Other cognitions found that are stronger predictors of behaviour (e.g., intentions, self-efficacy) suggesting that this is an incomplete model that would benefit from extensions to include other cognitions to increase the predictive power of the model
1: Predicting Health Behaviour
Theory of Planned Behaviour
Continuum theory - people are likely to perform behaviour based on their position on a continuum
- Sets out a decision-making process that determines an individual’s decision to carry out a particular behaviour
- Extension to Theory of Reasoned Action (TRA; Fishbein & Ajzen, 1975)
- TPB proposes that behaviour is determined by intentions to engage in that behaviour, and perceptions of control over that behaviour
- Intentions are determined by attitudes, subjective norms and perceived behavioural control
1: Predicting Health Behaviour
Theory of Planned Behaviour: Key Defintions
Attitude - the individual’s overall positive or negative evaluation of the behaviour
Subjective norm: the individual’s perception of the views of important others
Perceived behavioural control: the individual’s perception of the extent to which performance of the behaviour is easy or difficult i.e. under their control
1: Predicting Health Behaviour
Theory of Planned Behaviour and Intentions
The theory of planned behaviour would state that n individual is more likely to perform a behaviour if they form an intention to do so…
an intention forms because the individual has a positive attitude towards the behaviour, they think that important people (to them) would want them to and that the behaviour is under their control
1: Predicting Health Behaviour
The predictive value of the Theory of Planned Behaviour
Armitage & Conner (2001) report that:
- Intentions are the strongest predictor of behaviour
- Attitudes are the strongest predictor of intention
- Attitude + Subjective Norm + PBC predicts 39% of the variance in intentions
- Intention + PCB accounts for 27% of the variance in behaviour
1: Predicting Health Behaviour
Strengths and Limitations of the Theory of Planned Behaviour
Strengths:
- proposes how cognitions affect behaviour indirectly & how beliefs combine to influence motivation and action.
- social influences on action are considered
- has been successfully applied to a range of health behaviours
- widely used in designing interventions to change behaviour
Limitations:
- significant variation across behaviours & components differ in their predictive value (SN in particular)
- more successful in predicting behaviours that are largely under volitional control. TPB is less successful with predicting complex ‘risk’ behaviours (e.g., condom use), and also less successful with younger people
- Much variance remains unexplained! Possibly due to the intention-behaviour gap
- Addition of other predictive variables increase the predictive power – e.g., past behaviour/habit is a strong predictor of future behaviour
- The volitional phase of action is not addressed – i.e., how are intentions translated into action?
- Emphasis on rational and conscious reflection of decision making process – may not apply to all decisions
1: Predicting Health Behaviour
Overview of Stage Theories
• Stage models imply that there are qualitatively different stages in the initiation and maintenance of behaviour
- Individual progresses through stages to successfully change their behaviour
- Different factors (cognitions) are important at different stages for promoting health behaviour
• Four principles of stage models (Weinstein et al., 1998):
- Mutually exclusive stages
- Sequential stages
- Individuals should experience common barriers to change within a stage
- Individuals should experience different barriers to change across different stage.
- Longitudinal data examines stage sequences & comparison of relevant stage variables
1: Predicting Health Behaviour
Stage of Change Model / Transtheoretical Model
Stage model - people move through different “stages” towards behaviour
Emerged from work on addictive behaviours…
Progress through 5 discrete stages of change: 1. Pre-contemplation 2. Contemplation 3. Preparation 4. Action 5. Maintenance > Relapse
1: Predicting Health Behaviour
Transtheoretical Model - Worked example
Alcohol behaviour change
Precontemplation - individual is drinking, no intention to change in the next 6 months
Contemplation - individual is drinking but they intend to stop in the next 6 months
Preparation - indivudual is drinking less, intend to stop in the next 6 months
Action - individual has stopped drinking to excess within the past 6 months, percieved benefits are greater than percieved costs (Least stable stage)
Maintenance - individual has been a non-drinker for over 6 months - risk of relapse is small
1: Predicting Health Behaviour
Predicting TTM stage transitions in relation to condom-carrying behaviour
(Arden and Armitage 2008)
Longitudinal experimental design
- 525 adolescents aged 16-22 - questionnaire (intervention vs control, 2 month follow up).
Cross sectional – between stages
Prospective – predictors of stage transitions
Implementation intentions – progression from preparation to action stages
1: Predicting Health Behaviour
Strengths and Limitations of the TTM
Strengths:
- Popular, appealing model
- Allows for relapse as well as forward progression through the stages to positive behavioural change
- Emphasises importance of maintenance
- Behaviour change is a dynamic (non-linear) process
Limitations:
> Evidence to support ‘stages’ is weak:
- There is little support for clear cut stages with different cognitive processes (Rosen 2000)
- Difficult to define and measure the different stages, distinctions are “logically flawed” and based on “arbitrary time periods” (Sutton, 2005)
- “Pseudo stages” – Bandura 1998
> Stages as categorisation of a continuum