AKT1 and psychiatric disorder: Because AKT mutations and single nucleotide polymorphisms (SNP)s have been linked to psychiatric disorders like schizophrenia (Emamian et al., 2004; Ikeda et al., 2004; Schwab et al., 2005; Xu et al., 2007) and extinction is altered in the disorder (Craske et al., 2018), we also examined extinction learning in Akt isoform mutants after fear conditioning.