@psychologician
You might find a few browsing through the profiles on https://scicomm.xyz/explore and https://fediscience.org/explore
Once you follow a few, checking out the people they boost (aka retoot) is a good way to keep finding more like them.
@psychologician
The usual avenues are https://fedi.directory/
https://communitywiki.org/trunk
https://fediverse.info/explore/people
but none of those seem to be useful in this case (probably because most academic psychologists are here with the new wave, and the sites haven't been updated with their info).