Article Figures & Data
Figures
- Fig. 1.
Photomicrographs showing the region of basolateral amygdala (ABL) and amygdala central nucleus (CN) in a vehicle-injected control brain (top panel) and in an ABL NMDA-lesioned brain (bottom panel). Note neuron loss and gliosis at the ABLlesion site, and sparing of neurons in CN.
- Fig. 2.
First-order conditioned responses displayed by rats with basolateral amygdala lesions (ABL) and unlesioned control rats (CTL) during the light reminder trials in Phase 2 of Experiment 1A. Combined performance of the rats that received light–food pairings (Groups PP andPU) is indicated by the open bars and performance of the rats that received unpaired presentations of light and food (Group UP) is indicated by the solid bars.
- Fig. 3.
Second-order conditioned responses displayed by rats with basolateral amygdala lesions (ABL) and unlesioned control rats (CTL) during tone presentations in Phase 2 of Experiment 1A. Performance of rats that received both light–food and tone–light pairings (GroupPP) is indicated by the solid symbols, and the combined performance of rats that received light–food pairings but no tone–light pairings (Group PU) and rats that received tone–light pairings but not light–food pairings (GroupUP) is indicated by the open symbols. Session P refers to the pretest of the tone at the beginning of Phase 2.
- Fig. 4.
Food consumption in the taste aversion conditioning and test phases of Experiment 1B (left) and conditioned food-cup responding to the first-order light CS (right) after taste aversion training. The filled symbols and bars indicate performance of rats for which the food pellets were devalued by pairings with LiCl injections in the taste aversion conditioning phase, and theopen symbols and bars indicate performance of control rats that received unpaired presentation of food and LiCl. ABL refers to rats with basolateral amygdala lesions and CTL to unlesioned rats.
- Fig. 5.
Photomicrographs showing the region of basolateral amygdala (ABL) and amygdala central nucleus (CN) in a vehicle-injected control brain (top panel) and in a CN ibotenate-lesioned brain (bottom panel). Note neuron loss and gliosis at the CNlesion site, and sparing of neurons in ABL.
- Fig. 6.
First-order conditioned responses displayed by rats with central nucleus lesions (CN) and unlesioned control rats (CTL) during the light reminder trials in Phase 2 of Experiment 2A. Combined performance of the rats that received light–food pairings (Groups PP andPU) is indicated by the open bars and performance of the rats that received unpaired presentations of light and food (Group UP) is indicated by the solid bars.
- Fig. 7.
Second-order conditioned responses displayed by rats with central nucleus lesions (CN) and unlesioned control rats (CTL) during tone presentations in Phase 2 of Experiment 2A. Performance of rats that received both light–food and tone–light pairings (Group PP) is indicated by the solid symbols, and the combined performance of rats that received light–food pairings but no tone–light pairings (GroupPU) and rats that received tone–light pairings but not light–food pairings (Group UP) is indicated by the open symbols. Session Prefers to the pretest of the tone at the beginning of Phase 2.
- Fig. 8.
Food consumption in the taste aversion conditioning and test phases of Experiment 2B (left) and conditioned food-cup responding to the first-order light CS (right) after taste aversion training. The filled symbols and bars indicate performance of rats for which the food pellets were devalued by pairings with LiCl injections in the taste aversion conditioning phase, and theopen symbols and bars indicate performance of control rats that received unpaired presentation of food and LiCl. CN refers to rats with central nucleus lesions and CTL to unlesioned rats.
Tables
Group Phase 1 Phase 2 First-order conditioning Pretest tone Second-order conditioning Reminder trials PP Light→food Tone Tone→light Light→food PU Light→food Tone Tone, light Light→food UP Light, food Tone Tone→light Light, food The tone pretest occurred during the first half of the first session of Phase 2. Second-order conditioning and first-order reminder trials were randomly intermixed throughout the remainder of Phase 2. →, Paired presentation; , indicates explicitly unpaired presentation.
