
Keywords: 8-OH-DPAT, (±)-8-hydroxy-2-(di-n-propylamino) tetralin hydrobromide; DOI, (±)-2,5-dimethoxy-4-iodo amphetamine hydrochloride; dPAG, dorsal periaqueductal gray; KCN, potassium cyanide; NTS, nucleus of tractus solitarius; SFA, suffocation false alarm theory