Which experiment do you think had the biggest negative or positive affect on psychology?

Question: Which experiment do you think had the biggest negative or positive affect on psychology?
- Keywords:
  experiment,
  impact,
  negative,
  positive
Asked by MillieH on 18 Jun 2023.
- Helen Dudfield answered on 18 Jun 2023:
  
  I think Milgrams studies had enormous impact but are ethically unacceptable today. Informed consent and voluntary withdrawal are key lessons applied since then.
- Chloe Tasker answered on 23 Jun 2023:
  
  I have to agree with Helen here!

Question: Which experiment do you think had the biggest negative or positive affect on psychology?