“…With acute onset packing not due to skill deficits or lack of experience, the original aetiology may be medical in nature (e.g., gastrointestinal issues; Hagopian et al, 1996; Williams et al, 2011) or a triggering event (e.g., choking episode, allergic reaction, major life changes such as in caregivers or schools; Lenz et al, 2018; Lesser et al, 2022; Seiverling et al, 2016; Tang et al, 2011). However, even once the original aetiology has resolved, packing may persist due to behavioural reasons (e.g., to gain interaction or preferred items or activities, to avoid nonpreferred tasks) (Girolami & Scotti, 2001; González et al, 2014; Piazza et al, 2003; Rivero & Borrero, 2019).…”