期刊
JOURNAL OF NEUROSCIENCE
卷 35, 期 41, 页码 14070-14075出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.2690-15.2015
关键词
Arc; norepinephrine; odor discrimination; olfactory bulb; pattern separation; piriform cortex
资金
- Canadian Institutes of Health Research [MOP-102624]
- Natural Sciences and Engineering Research Council of Canada [418451-2013]
Arc ensembles in adult rat olfactory bulb (OB) and anterior piriform cortex (PC) were assessed after discrimination training on highly similar odor pairs. Nonselective alpha- and beta-adrenergic antagonists or saline were infused in the OB or anterior PC during training. OB adrenergic blockade slowed, but did not prevent, odor discrimination learning. After criterion performance, Arc ensembles in anterior piriform showed enhanced stability for the rewarded odor and pattern separation for the discriminated odors as described previously. Anterior piriform adrenergic blockade prevented acquisition of similar odor discrimination and of OB ensemble changes, even with extended overtraining. Mitral and granule cell Arc ensembles in OB showed enhanced stability for rewarded odor only in the saline group. Pattern separation was not seen in the OB. Similar odor discrimination co-occurs with increased stability in rewarded odor representations and pattern separation to reduce encoding overlap. The difficulty of similar discriminations may relate to the necessity to both strengthen rewarded representations and weaken overlap across similar representations.
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