“…Twenty‐four studies (67% of instrumental studies) used acoustic analyses, five studies (14%) used facial motion tracking (Gladfelter & Goffman, 2018; Kothare et al, 2021; Manfredonia et al, 2019; Parish‐Morris et al, 2018; Samad et al, 2019), two studies (5%) used electromyography to measure muscle activation (Cattaneo et al, 2007; Pascolo & Cattarinussi, 2012), and two studies (5%) used magnetic resonance imaging of the brain (Chenausky, Kernbach, et al, 2017; Heller Murray et al, 2022). Each of the following methods was used in only one study: nasometry (Kasthurirathne et al, 2020), magnetoencephalography (Pang et al, 2016), and ultrasound tongue imaging (McKeever et al, 2022).…”