“…), preferred interests are described under symptom area B3 in the diagnostic criteria for ASD as ‘highly restricted, fixated interests that are abnormal in intensity or focus (e.g., strong attachment to or preoccupation with unusual objects, excessively circumscribed or perseverative interests)’ (p. 50). Several examples of preferred interests have been described in single‐subject design studies of children with ASD, such as jigsaw puzzles (Carnett et al, 2014), letters and numbers (Vismara & Lyons, 2007), and finger painting (Vacca, 2007).…”