“…There are different investigations indicating neurobiology of anxiety and drugs that induced anxiety-like behaviors in different brain regions (Zarrindast, Nasehi et al, 2010;Nasehi, Mafi et al, 2011;. Although, traditionally, the NAc shell has been considered a region involved in defensive and anxiety-like behaviors (Martinez, Ropero et al, 2002;Avena, Rada et al, 2008); (Pliakas, Carlson et al, 2001); (Reynolds and Berridge 2003) (da Cunha, Lopes et al, 2008), locomotion (Gargiulo 1996) (Martinez, Ropero et al, 2002) and depression (Shirayama and Chaki 2006).…”