▁developed ▁a ▁range ▁of ▁ps y cho active ▁dru gs ▁such ▁as ▁an xi ol ytics . ▁ ▁Many ▁of ▁these ▁dru gs ▁are ▁developed ▁and ▁tested ▁by ▁using ▁a ▁range ▁of ▁labor atory ▁species . ▁ ▁It ▁is ▁incons istent ▁to ▁argue ▁that ▁these ▁dru gs ▁are ▁effective ▁in ▁tre ating ▁human ▁emot ions ▁whilst ▁den ying ▁the ▁experience ▁of ▁these ▁emot ions ▁in ▁the ▁labor atory ▁animals ▁on ▁which ▁they ▁have ▁been ▁developed ▁and ▁tested . ▁ ▁Standard ▁labor atory ▁c ages ▁prevent ▁m ice ▁from ▁performing ▁several ▁natural ▁behav i ours ▁for ▁which ▁they ▁are ▁highly ▁motiv ated . ▁As ▁a ▁consequence , ▁labor atory ▁m ice ▁sometimes ▁develop ▁ab normal ▁behav i ours ▁indic ative ▁of ▁emot ional ▁dis orders ▁such ▁as ▁de pression ▁and ▁anx iety . ▁To ▁improve ▁w elf are , ▁these ▁c ages ▁are ▁sometimes ▁en rich ed ▁with ▁items ▁such ▁as ▁nest ing ▁material , ▁sh el ters ▁and ▁running ▁whe els . ▁ ▁Sher win ▁and ▁O ll son ▁tested ▁whether ▁such ▁en rich ment ▁influenced ▁the ▁consumption ▁of ▁Mid az ol am , ▁a ▁drug ▁widely ▁used ▁to ▁treat ▁anx iety ▁in ▁humans . ▁ ▁M ice ▁in ▁standard ▁c ages , ▁standard ▁c ages ▁but ▁with ▁un predict able ▁husband ry , ▁or ▁en rich ed ▁c ages , ▁were ▁given ▁a ▁choice ▁of ▁drink ing ▁either ▁non - dru gg ed ▁water ▁or ▁a ▁solution ▁of ▁the ▁Mid az ol am . ▁ ▁M ice ▁in ▁the ▁standard ▁and ▁un