SELECTIVE IMPAIRMENT OF SONG LEARNING FOLLOWING LESIONS OF A FOREBRAIN NUCLEUS IN THE JUVENILE ZEBRA FINCH
SELECTIVE IMPAIRMENT OF SONG LEARNING FOLLOWING LESIONS OF A FOREBRAIN NUCLEUS IN THE JUVENILE ZEBRA FINCH
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DOI：
10.1016/0163-1047(90)90797-a
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发表时间：
1990-01-01
期刊：
影响因子：
--
通讯作者：
NORDEEN, KW
中科院分区：
文献类型：
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作者：
SOHRABJI, F;NORDEEN, EJ;NORDEEN, KW
X区是鸟类腹侧前脑的一个大型性二态核，是一个高度离散的相互连接的核团系统的一部分，该系统与歌曲学习或成年歌曲产生有关。以前，这个核团被包括在鸣唱系统中，因为它与其他发声控制核团有着实质性的联系，而且它的音量与鸣唱能力呈正相关。为了直接评估X区在鸣唱行为中的作用，使用鹅膏蕈氨酸对青少年和成年斑胸草雀的该核进行了双侧损伤。我们在这里报告说，X区损伤破坏了正常的歌曲在幼鸟的发展，但不影响生产的定型歌曲的成年鸟。虽然青少年病变的鸟类一直被判断为在声乐发展的早期阶段比年龄匹配的控制，他们继续产生正常的歌曲般的发声。因此，不像外侧大细胞核的前新纹状体，另一个鸟类前脑核牵连在歌曲学习，区域X似乎不是必要的维持生产的少年歌曲。相反，行为结果表明，X区域对于获得歌曲模型或通过声乐练习改善歌曲非常重要。
Area X, a large sexually dimorphic nucleus in the avian ventral forebrain, is part of a highly discrete system of interconnected nuclei that have been implicated in either song learning or adult song production. Previously, this nucleus has been included in the song system because of its substantial connections with other vocal control nuclei, and because its volume is positively correlated with the capacity for song. In order to directly assess the role of Area X in song behavior, this nucleus was bilaterally lesioned in both juvenile and adult zebra finches, using ibotenic acid. We report here that lesioning Area X disrupts normal song development in juvenile birds, but does not affect the production of stereotyped song by adult birds. Although juvenile-lesioned birds were consistently judged as being in earlier stages of vocal development than age-matched controls, they continued to produce normal song-like vocalizations. Thus, unlike the lateral magnocellular nucleus of the anterior neostriatum, another avian forebrain nucleus implicated in song learning, Area X does not seem to be necessary for sustaining production of juvenile song. Rather, the behavioral results suggest Area X is important for either the acquisition of a song model or the improvement of song through vocal practice.