“…This response is consistent with what Skinner referred to as a tact, a verbal response evoked by a nonverbal stimulus (Skinner, 1957), hereafter referred to as a tacting DOR. Studies have used a tacting DOR across a variety of tasks, including delayed matching to sample (DMTS; e.g., Broomfield et al, 2008;Constantine & Sidman, 1975;Geren et al, 1997;Gutowski & Stromer, 2003;Gutowski et al, 1995), constructed response matching to sample (CRMTS; e.g., Tanji et al, 2013), sorting (e.g., Duarte & Baer, 1994;Fjellstrom et al, 1988), vocal tacting (e.g., Devine & Petursdottir, 2022), and observational learning (e.g., Blowers et al, 2021). Selected exemplar studies are discussed briefly in the following paragraphs to illustrate the procedures used in these studies.…”