FIGURE 6.

Dopamine transporter knockout mice are more sensitive than WT mice to extinction. (A) Rate of licking throughout the 30-min extinction session. (B) Rate of licking throughout the session normalized by the average rate of licking for sucrose. KO mice reduce their lick rate more quickly than WT mice. KO mice show fewer bouts of licking (C) and more licks per bout (D). (E) Representative examples of lick duration throughout the session from WT (top) and KO (bottom) mice. (F) Median duration of licks. Sucrose indicates data from the last rewarded session. (G) Inter quartile range of lick duration. ^∗p < 0.05. Points represent data from individual mice. Lines represent mean and SEM.