When a researcher unintentionally or unconsciously influences the outcome of any research they are conducting
1. Non-verbal communication
2. Physical characteristics
3. Bias in interpretation of data
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Hawthorne effect
Present when the increased attention given by the researchers is a confounding variable in a study
Evaluation apprehension may lead to ppt trying harder than they would usually do, distorting the results collected
Detecting this effect requires info about similar activities carried out when the ppts didn’t know they were under investigation
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Social desirability bias
Bias in ppts behaviour occurs when they note aspects of the study that have to do with particular social norms or expectations, and in turn present themselves in what they seem a socially acceptable fashion
Could make the data inaccurate
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Demand characteristics
High risk that ppts will change their natural behaviour in line with their interpretation of the aims of a study - affecting how they respond
Ppts may try to please the researcher or may deliberately try to skew the results (‘screw you’ effect)
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