Maguire (2000) Flashcards

1
Q

What were Maguire’s 2 aims?

A

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

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2
Q

What was the sample of the experimental group?

A
  • 16 males
  • licensed as black taxi drives
  • 1.5-42 years experience
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3
Q

What are the weaknesses of the experimental sample?

A
  • gender bias (only men = androcentric)
  • culture bias (only London = ethnocentric)
  • small (16) = lacks population validity - not representative or generalisable
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4
Q

What was the sample of the control group?

A
  • 50 brain scans
  • obtained from a database
  • right handed
  • 32-62 years old
  • healthy
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5
Q

What was the sample design?

A

Matched Pairs

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6
Q

What are the strengths of the sample design?

A
  • reduced individual differences
  • reduced chance of demand characteristics and order effects
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7
Q

What are the weaknesses of the sample design?

A

individual differences still remain (not possible to completely remove)

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8
Q

How were participants from the experimental and control groups matched?

A
  • health
  • handedness
  • sex
  • age
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9
Q

What should be noted about one participant?

A

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

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10
Q

What is the test about taxi driving called?

A

The Knowledge

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11
Q

What is the premise of ‘The Knowledge’?

A
  • intensive 2 year training course
  • need to learn 25,000 streets
  • general knowledge of major routes and points of interest
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12
Q

What is the method?

A
  • Quasi Experiment
    (+ correlation)
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13
Q

What makes this study a quasi?

A

the sample were already London black taxi drivers or not

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14
Q

What are strengths of a quasi experiment?

A
  • reduced researcher bias
  • ecological validity
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15
Q

What are the weaknesses of a quasi experiment?

A
  • lack of control = less reliable / valid
  • cannot establish causality
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16
Q

What is the DV?

A

volume of hippocampi including anterior (front); body (middle); posterior (back) regions

17
Q

What is the IV?

A

being a taxi driver or not being a taxi driver

18
Q

What are the two tests that measures the DV?

A

VBM and Pixel Counting

19
Q

What type of scientific measure was used?

A

MRI scans

20
Q

What is the design?

A

independent measures

21
Q

What are strengths of the design?

A
  • reduced chance of demand characteristics and order effects
22
Q

What are the weaknesses of the design?

A
  • individual differences
23
Q

What was the purpose of the MRI scan?

A
  • shows 2D and 3D images of brain structure and grey matter
24
Q

What was used to analyse the results of the MRI?

A

VBM = Voxel Based Morphometry

25
Q

What did the VBM produce?

A

3D Grey Matter in brain regions

26
Q

What did Pixel Counting produce?

A

2D overall hippocampal volume of structures

27
Q

What is VBM?

A

an automatic computer software that ‘normalises’ the scans to eliminate overall brain size as an extraneous variable - gives output to the size of the hippocampi

28
Q

What is Pixel Counting?

A

image slices which are analysed by a blind researcher - counted to indicate the volume of the anterior, body, and posterior cross-sections of the hippocampi

29
Q

Why is Pixel Counting a strength?

A
  • controlled conditions
  • blind researcher = objective - no researcher bias
30
Q

Why is using an MRI ethical?

A

antiinvasive and unharmful

31
Q

What were the key findings from the VBM?

A
  • showed no significant differences between the brains of taxi drivers and controls - except for the hippocampi
  • taxi drivers had significantly more grey matter volume in the right and left posterior hippocampi
  • controls had more grey matter volume in the right and left anterior hippocampi
32
Q

What were the key findings for Pixel Counting?

A
  • no significant differences between overall volume of the hippocampi = no other grey matter had been removed from any other areas of the brain
  • taxi drivers had significantly more volume in the left posterior hippocampi
  • controls had more volume in the right anterior and body of the hippocampi
  • suggests that taxi drivers have a different brain structure
33
Q

What were the key findings from the correlational analysis?

A
  • positive correlation was found between length of time as a taxi driver and posterior hippocampal volume (0.6)
  • negative correlation was found between length of time as a taxi driver and anterior hippocampal volume
  • indicates that the brain changes over time to meet demands of being a taxi driver
34
Q

What type of data did Maguire collect?

A

Quantitative

35
Q

What are the strengths of this type of data?

A
  • objective
  • easy to analyse and compare
36
Q

What are the weaknesses of this type of data?

A

does not provide detailed reasoning as to the WHY behind behaviour

37
Q

What were the conclusions?

A
  • there are regionally specific structural differences between the hippocampi of London taxi drivers and controls
  • there is local plasticity in the structure of the brain as it adapts in response to prolonged environmental stimuli