“…Various paradigms for invariance learning have been proposed that exploit this observation (Földiak, 1991;Wallis & Rolls, 1997;O'Reilly & Johnson, 1994;Stone & Bray, 1995;Einhäuser, Hipp, Eggert, Körner, & König, 2005). As these paradigms extract the slowly varying components of sensory signals, we will refer to this approach as the slowness principle (Wiskott & Sejnowski, 2002), in related literature also called temporal coherence or temporal stability principle (Einhäuser et al, 2005;Hurri & Hyvärinen, 2003;Wyss, König, & Verschure, 2006).…”