Maguire (2000) Flashcards
What were Maguire’s 2 aims?
1) to investigate the extent of structural changes in the hippocampus of London taxi drivers as a result of extensive navigational experience
2) to see if there is a correlation between length of time of taxi driving experience and the measure of grey matter volume
What was the sample of the experimental group?
- 16 males
- licensed as black taxi drives
- 1.5-42 years experience
What are the weaknesses of the experimental sample?
- gender bias (only men = androcentric)
- culture bias (only London = ethnocentric)
- small (16) = lacks population validity - not representative or generalisable
What was the sample of the control group?
- 50 brain scans
- obtained from a database
- right handed
- 32-62 years old
- healthy
What was the sample design?
Matched Pairs
What are the strengths of the sample design?
- reduced individual differences
- reduced chance of demand characteristics and order effects
What are the weaknesses of the sample design?
individual differences still remain (not possible to completely remove)
How were participants from the experimental and control groups matched?
- health
- handedness
- sex
- age
What should be noted about one participant?
one taxi drivers data was not included in the correlational analysis as he had 42 years experience and was a clear outlier - would have skewed data
What is the test about taxi driving called?
The Knowledge
What is the premise of ‘The Knowledge’?
- intensive 2 year training course
- need to learn 25,000 streets
- general knowledge of major routes and points of interest
What is the method?
- Quasi Experiment
(+ correlation)
What makes this study a quasi?
the sample were already London black taxi drivers or not
What are strengths of a quasi experiment?
- reduced researcher bias
- ecological validity
What are the weaknesses of a quasi experiment?
- lack of control = less reliable / valid
- cannot establish causality