1. minimal groups experiments.
Experiments in inter-group discrimination
Henri Tajfel (1970)
Tajfel is best known for his
minimal groups experiments.
and for developing
Social Identity Theory

2. Ethnocentrism thinking your group is better than anyone else’s
Key Concept
Ethnocentrism
thinking your group is better than anyone else’s
It occurs as soon as people are divided into groups.
It doesn’t matter what the group is or how it was formed – as soon as people are in a group they perceive it as being superior to other groups and we develop what is known as ‘in-group bias’.

3.   
Social Identity theory states that people get their identity from the group to which they perceive they belong.
 However to gain an identity, we need to make comparisons between our group and other groups, and in order for our identity to be positive we need to see our group as being superior to other groups.

4. One of the most famous pieces of research looking at in-group bias (ethnocentrism) was by Sherif (1956 )– known as the ‘Robbers Cave Study’.
(This is one you should find out about as part of your background reading).

5. Sherif suggested that ethnocentrism occurs where there is conflict or competition between groups.
Tajfel claims that simply being in a group and being aware of the existence of another group is sufficient for the development of some kind of prejudice. Consequently discrimination in favour of the ‘in-group’ will occur.

6. Experiments in inter-group discrimination
The aim of Tajfel’s study was to provide evidence that merely belonging to one group and being aware that another group existed would lead to discriminatory behaviour in favour of your own group.
Tajfel preferred to investigate DISCRIMINATION (a behaviour) rather than PREJUDICE (a belief) because discrimination is observable and therefore easier to measure objectively.
Tajfel did 2 studies and you need to know BOTH of them.

7. Experiments in inter-group discrimination
Experiment One
participants:
64 boys aged 14 & 15 from a Bristol comprehensive school.
Came to the laboratory in groups of 8.
All knew each other well
Question:
What kind of sample did Tajfel use for his experiments into discrimination?
What is the limitation of this kind of sample?

8. This is what he did - we are going to do it too!
He told the boys they were taking part in an experiment about visual judgement.
For this you will need:
A pen;
A sheet of paper;
You are about to see a series of slides with various numbers of dots in on them.
On the paper you will need to guess how many dots are on each of the next 5 slides.

9. Trial One

10. Trial Two

11. Trial Three

12. Trial Four

13. Trial Five

14. Phase one was designed to create ‘group’ identity’

15. Tajfel showed 40 sets of dot clusters to the ppts
Tajfel showed 40 sets of dot clusters to the ppts. He then told the ppts, ‘when I have seen your scores you will be given a card putting you into a group’.
For example – some boys were
An overestimator (i.e. They were told ‘you have consistently overestimated the number of dots displayed’);
An underestimator (i.e. you have consistently underestimated the number of dots displayed);
The boys were given clear instructions
DO NOT show anyone your card (it is your secret ).

16. In actual fact this was a lie!
He didn’t even
Look at the guesses
The boys were randomly
allocated to the conditions

17. This is an example of what is known as a Matrix
For member no 3 of own group 9 11 12 14 16
For member no 5 of own group 5 6 15 19
The key to using this matrix is to note that the two group members you are allocating rewards for are people who are in your group (even though you don’t know who they are).

18. Experiments in inter-group discrimination
The boys were told that the numbers in the matrices represented units of 1/10 of a penny and that they were giving money to the other boys.
Never could a boy award money to himself.
The boys also did not know the identity of any member of either group.

19. For member 3 of own group 9 11 12 14 16
For member 5 of own group 5 6 15 19
You need to allocate to points to the members of your group using the points making sure that you only allocate a pair of points.
For example if you give member number (3) 11 points then member number (5) should be given 6 points. You have to allocate pairs of points.

20. Using the matrix below (see your sheet)
For member 4 of own group 1 2 3 4 5 6 7 8 9 10 11 12 13 14
For member 7 of own group
Without knowing who is in your group (as this may affect how much you give to them) - you will need to select a pair of numbers to give to people who are in your group.

21. Using the matrix below:
For member 5 of other group 1 2 3 4 5 6 7 8 9 10 11 12 13 14
For member 8 of other group
Without knowing who is in the other group (as this may affect how much you give to them) - you will need to select a pair of numbers to give to people who are in the other group.

22. Using the matrix below
For member 01 of own group 1 2 3 4 5 6 7 8 9 10 11 12 13 14
For member 02 of other group
Here the task is to allocate points to someone in your group (i.e. the top row) as well as to someone who is in the other group (i.e. the bottom row).
Remember, you still have to follow the rule – you must allocate a pair of points!

23. Strategies?
Tajfel was interested in looking at the way the participants allocated the rewards. He wanted to see if the same strategies were being used when rewards were being allocated to members of your own group verses when rewards were being allocated to members of the ‘other’ group.

24. Tajfel wanted to see if he could ‘make’ discrimination appear based on meaningless tasks.
Where the boys were asked to allocate points to people who were in their in-group they were fair to them by giving them the 7/8 or 8/7 combination.
For member 01 of own groupted 1 2 3 4 5 6 7 8 9 10 11 12 13 14
For member 02 of own group

25. Results
Where they were asked to allocate points to people who were in their out-group they were also fair to them by giving them the 7/8 or 8/7 combination.
For member 01 of out group 1 2 3 4 5 6 7 8 9 10 11 12 13 14
For member 02 of out group

26. Results
Where they were asked to allocate points to people who were in the in-group & the out-group they tended to have discriminated by giving their in-group 14 & their out-group 1 (or maybe 13/2).
For member 01 of own group 1 2 3 4 5 6 7 8 9 10 11 12 13 14
For member 02 of other group
Why did we do this? Simply, we do not want people who are not ‘the same as us’ (over- or under-estimators) to have the same as someone who shares a characteristic with us – i.e. we discriminate.

27. Below are examples of work by the modern artists
Klee and Kandinsky –
Part 1:
Boys were shown 12 slides:
6 Kandinsky;
6 Klee;
Klee art
Kandinsky art

28. To clarify what strategies were being used he conducted a second experiment using a different group of Bristol school boys
Task Two
You are about to see series of art works by two different artists. The artists are Kandinsky and Klee.
The task that you will be asked to complete is to note whether you like or dislike the piece of art work.
On the worksheet there are numbers 1-8 and simply tick or cross to indicate whether you liked the picture or not.
Ready…

37. Yet again, once Tajfel ‘saw’ the scores the boys were given a card putting them into a group.
They were told they were a member of one of two groups.
A Kandinsky (i.e. your answers have shown that you prefer the Kandinsky paintings);
A Klee (i.e. your answers have shown that you prefer the Klee paintings);
Again they were told DO NOT show anyone your card (it is your secret ).

38. Experiments in inter-group discrimination
Experiment Two
The boys were presented with a series of matrices in which they had to award points in a similar manner to the previous experiment.
The boys were required to select a pair of numbers to award to members of their in-group and out-group.
On the next slide is an example of one of the matrices that would have been presented to the participants.

39. This is another example of a Matrix
Points allocated to Kandinsky member number 62 7 8 9 10 11 12 13 14 15 16 17 18 19
Points allocated to Klee member number 14 1 3 5 21 23 25
Award a pair of rewards one for the Kandinsky group member on the top row and one for the Klee group member on the bottom row.
Remember – you have to allocate a pair of points.

40. the following may have happened:
If you are a Kandinsky member you may have given your fellow Kandinsky group member 19 points and the Klee member 25 point. This did not happen that often – but it was the best strategy for maximum in-group profit and maximum joint profit
Points allocated to Kandinsky member number 62 7 8 9 10 11 12 13 14 15 16 17 18 19
Points allocated to Klee member number 14 1 3 5 21 23 25
Why would this result happen?

41. Why did so many of Tajfel’s ppts choose this strategy? Stop
On the other hand, some boys went for the fairness option !
BUT If you are a Kandinsky member you may have given your group member 7 points and the Klee member 1 point;
Points allocated to Kandinsky member number 62 7 8 9 10 11 12 13 14 15 16 17 18 19
Points allocated to Klee member number 14 1 3 5 21 23 25
Why did so many of Tajfel’s ppts choose this strategy? Stop

42. Recap procedure for experiment 1:
Experiments in inter-group discrimination
Recap procedure for experiment 1:
Part 1: Categorisation into groups (estimating dots)
There were forty trials of varying sizes of dot clusters presented to the boys.
An example of the dots trial…
Minimal group identity
What did Tajfel call the kind of group identity he created?

43. Experiments in inter-group discrimination
Part 2: Once the boys had seen all the forty trials they were (randomly)assigned to a group and asked to allocate points to other boys using matrices.
They were sat in separate cubicles and worked through a booklet of 18 matrices
singular = matrix but the plural = matrices
Some times penalty matrices were used with minus numbers -10

44. For member 04 of own group 1 2 -3 4 5 6 7 8 9 10 11 12 13 14
For member 03 of own group
For member 04 of other group 1 2 3 4 -5 6 7 8 9 10 11 12 13 14
For member 03 of other group
For member 04 of own group -1 2 3 4 5 6 7 8 9 10 11 12 13 14
For member 03 of other group

45. Inter-group discrimination was the deliberate strategy adopted in making inter-group choices
in-group/in-group: maximum fairness;
out-group/out-group: maximum fairness;
in-group/out-group: boys gave more points to in-group members than out group members;
These were very significant results! The boys were divided on a totally random and meaningless basis (estimating dots). Tajfel was able to demonstrate in-group favouritism and out-group discrimination based on MINIMAL GROUP IDENTITY

46. Experiments in inter-group discrimination
Experiment Two
The three strategies being examined were:
MJP – maximum joint profit – largest possible joint award for both people, i.e. points add up to the most;
MIP – maximum in-group profit – largest possible award to member of in-group, regardless of what out-group gets;
MD – maximum difference – largest possible difference in gain between a member of the in-group & member of the out-group (in favour of the in-group).

47. How does it work? An example…
Choice number
in-group member
out-group member
Maximum joint profit can be achieved with choice 5, giving 16 to the in-group and 19 to the other group.

48. How does it work? An example…
Choice number
in-group member
out-group member
Maximum in-group profit can be achieved with choice 5, giving 16 to the in-group – remember it does not matter what the out-group gets MIP is not looking at this variable.

49. How does it work? An example…
Choice number
in-group member
out-group member
Maximum difference (to maximise your own rewards while also maximising the difference), you might choose pair number 2 giving 11 to your own group & just 6 to the other group.

50. Experiment Two Klee and Kandinsky
in-group vs. out-group
Maximum joint profit not really used at all.
The most important factor in their choices was maximising the difference between the two groups.
This surprised Tajfel because it actually meant the boys left with less money than if they had all given each other the most amount of money available.

51. Prejudice and discrimination is very easy to trigger.
Conclusions
Prejudice and discrimination is very easy to trigger.
People like to behave in ways considered ‘appropriate’ – i.e. we conform to social norms. Two social norms are ‘groupness’ and ‘fairness.’
Tajfel felt that ‘groupness’ is stronger than fairness.

52. Tajfel and his student John Turner went on to develop the theory of social identity.
They proposed that people have an inbuilt tendency to categorize themselves into one or more in-groups, building a part of their identity on the basis of membership of that group and enforcing boundaries with other groups

53. Evaluation ?
Generalisability
Reliability Application Validity Ethics

54. Now read either the original study or the Brain additional material
On I Learn/blog for improved depth
and breadth