["Symbolic Interaction, Volume 44, Issue 1, Page 183-210, February 2021. ", "\nUsing video recordings of the setup phase of cognitive neuroscience experiments, we examine episodes where experimenters show and tell participants how a particular tool (a “blunt needle”) will be used and how that might feel. We analyze how experimenters describe and demonstrate prospective sensations for participants. We show that experimenters often describe sensations “by negation” (saying what participants will not experience) and sometimes “indirectly” (for example, by formulating what they will do). We show that these descriptions are elaborated through demonstrations of sensations, both on the experimenters' and the participants' bodies. Importantly, we document how the interplay of the description and demonstration of sensations is important in reassuring participants about the nonharmful nature of the tool and its \nuse.\n"]