<p>
I think they’re officially called “undergraduate assistants”. See, for example
<a href=“http://www.lsic.ucla.edu/classes/lifesci/central/ua/application.html[/url]”>http://www.lsic.ucla.edu/classes/lifesci/central/ua/application.html</a>
<a href=“http://www.psych.ucla.edu/undergraduate/fieldwork-internships/psychology-192-educational-practices-in-psychology[/url]”>http://www.psych.ucla.edu/undergraduate/fieldwork-internships/psychology-192-educational-practices-in-psychology</a></p>