“…Current theories in cognitive science have not fully accounted for the existence as well as the causes of these individual differences for scientific gain ( Underwood, 1975 ; Vogel and Awh, 2008 ). Most of the earlier studies in the gesture literature disregarded the variation among individuals and focused on group comparisons based on age (e.g., Feyereisen and Havard, 1999 ; Colletta et al, 2010 ; Austin and Sweller, 2014 ; Özer et al, 2017 ), sex (e.g., Özçalışkan and Goldin-Meadow, 2010 ), neuropsychological impairments (e.g., Cleary et al, 2011 ; Göksun et al, 2013b , 2015 ; Akbıyık et al, 2018 ; Akhavan et al, 2018 ; Hilverman et al, 2018 ; Özer et al, 2019 ; see Clough and Duff, 2020 for a review), culture, and the native status of the speakers and the listeners (i.e., bilinguals vs. monolinguals; e.g., Goldin-Meadow and Saltzman, 2000 ; Mayberry and Nicoladis, 2000 ; Pika et al, 2006 ; Kita, 2009 ; Nicoladis et al, 2009 ; Gullberg, 2010 ; Smithson et al, 2011 ; Kim and Lausberg, 2018 ; Azar et al, 2019 , 2020 ) to understand how human multimodal language faculty operates at a general level. The gesture theories and current experimental practices in the gesture literature mostly downplayed the significance of individual differences and treated them as error variance.…”