“…Although many studies have shown that practicing mental rotation can lead to an improvement in spatial reasoning skills (Cohen & Hegarty, 2007;Hoyek, Collet, Di Rienzo, De Almeida, & Guillot, 2014;Meneghetti, Borella, & Pazzaglia, 2016;Meneghetti, Cardillo, Mammarella, Caviola, & Borella, 2017;Rodán, Contreras, Elosúa, & Gimeno, 2016), these studies do not always use optimal methods for reliably detecting training effects (see Uttal et al, 2013, for review). Optimal methods include active control groups in which the control training task has levels of difficulty similar to those of the experimental task (Simons et al, 2016).…”