key study holland et al 1988 l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Key study: Holland et al (1988) PowerPoint Presentation
Download Presentation
Key study: Holland et al (1988)

Loading in 2 Seconds...

play fullscreen
1 / 11

Key study: Holland et al (1988) - PowerPoint PPT Presentation


  • 611 Views
  • Uploaded on

Key study: Holland et al (1988). Aim: To examine if there is a higher concordance rate between MZ twins than DZ twins for AN MZ twins share 100% of genes, DZ twins 50% If AN was genetic, there should be a higher rate amongst MZ twins. Key study: Holland et al (1988). Procedure

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Key study: Holland et al (1988)' - benjamin


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
key study holland et al 1988
Key study: Holland et al (1988)
  • Aim:
    • To examine if there is a higher concordance rate between MZ twins than DZ twins for AN
    • MZ twins share 100% of genes, DZ twins 50%
    • If AN was genetic, there should be a higher rate amongst MZ twins
key study holland et al 19882
Key study: Holland et al (1988)
  • Procedure
    • Opportunity sample of 34 pairs of twins based on one of the pair having a diagnosis of AN
    • Natural experiment (IV is naturally occurring: genetic similarity)
    • Longitudinal study
    • Interview + typical diagnosis for AN
key study holland et al 19883
Key study: Holland et al (1988)
  • Findings
    • Significant difference between MZ (56% concordance) and DZ (7% concordance) twins
    • Also, other psychiatric illnesses were common amongst non-anorexic twins
key study holland et al 19884
Key study: Holland et al (1988)
  • Conclusions
    • Suggests that AN may have a genetic influence
    • The fact that the concordance was not 100% shows that genes are not completely responsible, they just provide susceptibility to the disorder
    • This suggest that other influences are crucial
key study holland et al 19885
Key study: Holland et al (1988)
  • Criticisms
    • The high concordance may be due to factors other than genes – MZ twins tend to share a more similar environment than DZ twins
      • The look and behave similarly and are therefore treated alike
    • No control of IV (natural experiment) therefore this does not control for the fact that other variables may be involved
    • Ethnocentric (culturally biased – western only)
key study
Key Study
  • Behar et al (2001)
  • Study of psychological explanations of eating disorders
behar et al 2001
Behar et al (2001)
  • Aims
    • Effect of gender identity on eating disorders (ED)
    • Do behavioural explanations of eating disorders have any evidence?
    • Women may feel more pressure to be thin than men (idealised body image)
    • Is acceptance of the feminine gender role higher in ED women than normal controls?
behar et al 20018
Behar et al (2001)
  • Procedure
    • 126 participants (63 ED + 63 controls)
    • Natural experiment (ED not controlled by experimenter)
    • Clinical interview to ensure ED
    • Questionnaire to measure gender identity (BEM sex-role inventory)
behar et al 20019
Behar et al (2001)
  • Findings
    • Significant differences in gender identity in ED and non-ED
    • More ED were classified as feminine gender identity (43% compared to 23.8% controls)
    • More controls were found to be androgynous (31% compared to 19% ED)
    • More controls were undifferentiated (43% compared to 27%)
behar et al 200110
Behar et al (2001)
  • Conclusions
    • Supports SLT view that ED may be due to pressures women face in society to look a certain way
    • Shows the positive aspects of androgyny
behar et al 200111
Behar et al (2001)
  • Criticisms
    • Ignores genetic, cognitive and conditioning factors
    • Not a true experiment (no control over IV) – causation cannot be directly attributed to the IV. In this case, it could mean that ED caused the change in gender role identity
    • Ethnocentric