IGNORES INDIVIUAL DIFFERENCES- it is nomothetic so it looks for general laws of behaviour, generalising findings to everyone.Therefore, differences such as culture, age, gender etc. are often overlooked.
EXAMPLES- Most research in psychology has involved American participants who are mean and college students. The underlying assumption is that the behaviour of this group of people can be generaliosed to the whole population, ignoring that this group of people have unique characteristics, such as higher intelligence than average, interests that are typical of young male adults and so on.
Buss (mate preferences study)- criticised for overemphasising similarities of male and female mate preferences between different cultures. Actually, several differenced between mate preferecnes for both genders were not published. He assumed everyone was heterosexual making the results extremely difficult to generalise to everyone due to the complexity of human behaviour and difference between cultures.
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