Binder et al. (1999) experiment details

Appendix D endnote 5, from How Emotions are Made: The Secret Life of the Brain by Lisa Feldman Barrett.
Some context is:

By “subtracting” one brain scan from the other, Binder and his colleagues removed the brain activity related to sensory and motor details and observed an increase in activity within the default mode network, as predicted. [...] Binder showed that conceptual processing occurs even when people are not explicitly asked about concepts.

Binder and colleagues also included a third situation where test subjects rested with their eyes closed. During these rest periods, test subjects allowed their minds to wander — sometimes having spontaneous thoughts and memories, and sometimes attending to sights, sounds, and interoceptive sensations while inside the scanner. Activity in the default mode network during these rest periods was no different in degree when compared to the conceptual processing of words, but it was greater than during the perceptual task. This is evidence that the subjects’ spontaneous thoughts and memories during rest also required instances of concepts.