Adult Dop2RΔ2 homozygotes as well as Dop2RΔ2/Df(1)BSC587 and Dop2RΔ1/Dop2RΔ2 transheterozygotes show significantly decreased 3 min short-term memory in an aversive olfactory memory assay compared to controls. The shock and odor avoidance of Dop2RΔ2 homozygotes is normal.