Moreover, animal models of autism, such as rats prenatally exposed to valproic acid (VPA rats) (Schneider & Przewłocki, 2005; Schneider et al., 2006; Kerr et al.,2013), BALB/cByJ (Moy et al.,2008), Pax6 heterozygous mutant (rSey2/+) rats (Umeda et al.,2010), and mice with disruption in chromosome 7 (analogue of human locus 15q11-13) (Tamada et al.,2010), showed, in addition to other typical autistic behavioural deficits, also a reduction of exploratory behaviour. This evidence concerns the gene PAX6 and autism.