Most fishes have unstriated rays along the anterior part of the dorsal and ventral edges (leading edges) of the caudal fin.
在大多数鱼鳍,沿著背侧与腹侧缘前部有无条痕鳍条。在一些鱼中,虎鱼其有条痕与无条纹软条数量比在鑑定上是有帮助。
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Greater curiosity led to better retention on both tests; brain scans showed increased activity in the mesolimbic dopamine system, a reward pathway, and in the hippocampus, a region that matters for forming new memories.
更强的好奇心会让他们在这两个测试中表现出更好的记忆力,而脑扫描则显示中脑缘的多巴胺系统(奖励通路)以及海马区(与形成新记忆有关的区域)的活动增加了。