“…An example of this would be Stack et al (1996) including stroking and caressing in the same category as rubbing and massaging, even though the former have been shown to have distinct neurobiological mechanisms, associated with a special type of fibers called CT afferents (McGlone et al, 2014). Only relatively recently have stroking and caressing started to be treated as a separate category in coding schemes (e.g., Stack et al, 2014, as cited in Mercuri, 2019). Moreover, while being a relatively objective measure, PCIs observed in a lab, or even in a home setting, are quite an artificial situation for caregivers to find themselves in, likely affecting their behaviors in non‐negligible ways.…”