Astrocytes are more involved in cognition than researchers realized, at least when it comes to fear memory retrieval and extinction. Experiments in mice show that astrocytes dynamically track emotional state and help organize the neural activity patterns that represent fear.

· · 来源：tutorial资讯

After US President Donald Trump oversaw the seizure of his Venezuelan counterpart Nicolás Maduro last month, he vowed to tap the country's oil reserves – the world's largest.

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灯彩艺术秉承“图必有意，意必吉祥”的传统，形成了一套深厚而独特的文化符号体系。以蝙蝠、宝瓶、白象三种经典形象为例：作为独立的灯彩，它们分别象征福祉、平安与祥瑞。而清代《升平乐事图》中，宝瓶内插有戟，戟上悬挂万字符，白象驮载宝瓶，并配以如意、双钱等纹样，从而凝练成“平安纳吉”“太平有象”等层次更丰富的寓意。

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