Neurons in the Amygdala with Response-Selectivity for Anxiety in Two Ethologically Based Tests
نویسندگان
چکیده
The amygdala is a key area in the brain for detecting potential threats or dangers, and further mediating anxiety. However, the neuronal mechanisms of anxiety in the amygdala have not been well characterized. Here we report that in freely-behaving mice, a group of neurons in the basolateral amygdala (BLA) fires tonically under anxiety conditions in both open-field and elevated plus-maze tests. The firing patterns of these neurons displayed a characteristic slow onset and progressively increased firing rates. Specifically, these firing patterns were correlated to a gradual development of anxiety-like behaviors in the open-field test. Moreover, these neurons could be activated by any impoverished environment similar to an open-field; and introduction of both comfortable and uncomfortable stimuli temporarily suppressed the activity of these BLA neurons. Importantly, the excitability of these BLA neurons correlated well with levels of anxiety. These results demonstrate that this type of BLA neuron is likely to represent anxiety and/or emotional values of anxiety elicited by anxiogenic environmental stressors.
منابع مشابه
تاثیر میان کنش بین مورفین و سیستم آلفا- نورآدرنرژیک در هستۀ قاعدهای-جانبی آمیگدال بر اضطراب و حافظه.
Basolateral Amygdala is an important site of anxiety. Interactions between α-adrenergic and opioidergic systems in Basolateral amygdale were used for investigation anxiety and memory. The elevated plus-maze has been employed. The male wistar rats were used for this test. The site of BLA was cannulated bilaterally. Rats we injected morphine (4, 5.6 mg/kg) intraperitonealy, while clonidine ...
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