Memory measurement
To assess memory, after 280 trials of training to discriminate between pelargonic acid and valeric acid, memory trials were interleaved for 120 trials; that is, within each block of 20 trials two unrewarded amylacetate and two unrewarded ethylbutyrate trials were included. Memory scores are given as the fraction of those unrewarded trials that were responded to “correctly” (licking response to the odor that was rewarded in the initial training session [S+], no response to the odor that was not rewarded initially [S−]). Due to the epileptic phenotype and the slightly increased mortality [58], GluRBΔECS:FB mice were trained only for the initial period of 400 trials.