Figure 1.

Mean ± SEM taste-reactivity responses in the test session. Each trial comprised a 10-sec pre-tone period, 10 sec of tone alone, 5 sec of tone accompanied by deionized water, and a 10 sec post-tone interval. Rats in group Maintain had received tone → sucrose pairings followed by sucrose and toxin unpaired. Rats in group Devalue had received tone → sucrose pairings followed by sucrose–toxin pairings. Rats in the two control (CTL) groups had received tone and sucrose unpaired followed by sucrose either paired (d, devalue) or unpaired (m, maintain) with toxin. (A) Appetitive responses; (B) aversive responses.