期刊
BEHAVIORAL NEUROSCIENCE
卷 123, 期 4, 页码 810-814出版社
AMER PSYCHOLOGICAL ASSOC
DOI: 10.1037/a0016460
关键词
insular cortex; incentive relativity; neophobia; rats
资金
- NIDCD NIH HHS [R01 DC004341, R01 DC004341-05, R01 DC006456, DC06456, R56 DC006456-04A1, R56 DC006456, DC04341] Funding Source: Medline
Rats that are expecting a high value reward (e.g., 1.0 M sucrose) show an exaggerated underresponding when they are instead given a low value reward (e.g., 0.15% saccharin), an effect termed successive negative contrast (SNC). In the present experiment. insular cortex-lesioned (ICX) rats showed normal responsivity to sucrose and saccharin prior to the reward downshift. However, when switched from sucrose to saccharin during the postshift trials these rats displayed no evidence of SNC. Indeed, over the downshift trials these ICX rats consistently drank more saccharin than the ICX rats maintained on saccharin throughout the experiment. Potential interpretations are discussed including a lesion-induced impairment in the ability to accurately recognize the novelty of the postshift saccharin stimulus.
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