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Best-fitting regression equations for the relation between emotional ambiguity and the valence–arousal correlation for the (a) negative and (b) positive subfiles of the International Affective Picture System (Lang, Bradley, & Cuthbert, 2008) and for the (c) negative and (d) positive subfiles of the Nencki Affective Picture System (Marchewka, Łukasz, Jednoróg, & Grabowska, 2014).
