I worked on a research project about a year ago while working as a full-time RA/technician and some colleagues before leaving after my contract ended. We are currently finishing a manuscript for publication, in which I am a junior co-author.
I currently am not in a research position but am an adjunct instructor for a single online class. For this manuscript, what is the appropriate affiliation: the institution where I was last employed and the work involved with the paper, where I am an adjunct instructor, or an "independent scholar"?
(Other co-authors who have left the institution for different research positions list their new institutions. Everyone involved is in the United States, and the research was in psychology/behavioral science.)