Models of SEM during picture naming. Adapted from Goldrick and Rapp (2007) incorporating aspects of Fama and Turkeltaub (2020), Roelofs (2020), Hickok (2012), Nozari et al. (2011), Tourville and Guenther (2011), and Levelt (1983). Theoretical components shared across families of SEM models are outlined in blue. Components specific to production models are shown in green; comprehension models, in orange; sensorimotor models, in magenta.