"bar soap", "conventional oven", "film camera", and now, "task-fMRI"

"A 'retronym' is a new name for an object or concept to differentiate the original form or version of it from a more recent form or version."

Examples include "acoustic guitar" & "analog watch".

At the recent resting-state conference in Milwaukee, a new acronym was proposed: "T-fMRI", for task-fMRI, as distinguished from R-fMRI, for resting fMRI.