> The second study was an online survey conducted with 923 Amazon Mechanical Turk workers, whose average age was 40 years.

So psychology is now the study of mice, college freshman, and mechanical Turks? I have not seen this before.

It is very common. There are lines of research on dealing with the shortcomings of using mturk this way.

e.g. https://www.cambridge.org/core/services/aop-cambridge-core/c...