雌性斑胸草雀（Taeniopygia guttata）对同种、异种和孤立歌声的神经反应取决于早期生活中的歌声接触。
The neural response of female zebra finches (Taeniopygia guttata) to conspecific, heterospecific, and isolate song depends on early-life song exposure.
作者信息
Diez Adriana, Cui Alice, MacDougall-Shackleton Scott A
机构信息
Advanced Facility for Avian Research, London, ON, Canada; Neuroscience Graduate Program, University of Western Ontario, London, ON, Canada..
Department of Biology, University of Western Ontario, London, ON, Canada.
出版信息
Behav Processes. 2019 Jun;163:37-44. doi: 10.1016/j.beproc.2017.12.022. Epub 2017 Dec 21.
The auditory forebrain regions caudo-medial nidopallium (NCM) and caudo-medial mesopallium (CMM) of songbirds exhibit differential expression of the immediate-early gene ZENK in response to playback of different song stimuli, and dependent on early-life auditory experience. Similarly, song preferences depend both on auditory experience and unlearned biases for particular song features. We explored the contributions of early-life auditory experience and the type of song stimuli on the Zenk response in the auditory forebrain of female zebra finches. Females were raised in three different early tutoring conditions: conspecific tutors that sang isolate song, heterospecific tutors, or conspecific tutors that sang wild-type song. At maturity, these females were exposed to one of five different playback conditions: wild-type song, isolate song, tutor song, heterospecific song, or white noise. Subsequently, the number of cells immunoreactive for ZENK in CMM and NCM was measured. We predicted that birds exposed to conspecific song early in life, and during the song playback in adulthood, would have the highest neural response. Instead, we found that the Zenk response varied across playback conditions with the highest response to conspecific wild-type and conspecific isolate song. In addition, we found a main effect of tutoring, with the lowest overall Zenk response in females tutored by males singing isolate song. Most importantly, there was a significant interaction in that females tutored by wild-type conspecific or heterospecific songs showed a similar increased response to zebra finch songs (wild-type or isolate), but females tutored by isolate song showed no differential response to conspecific song and only showed elevated Zenk response to the particular songs they were tutored with. Combined, our results indicate that unlearned response biases to conspecific song elements depend on previous auditory experience. That is, early experience appears to modulate the expression of innate biases.
鸣禽的听觉前脑区域，即尾内侧巢皮质（NCM）和尾内侧中脑皮质（CMM），在对不同歌曲刺激进行回放时，会表现出即早基因ZENK的差异表达，且这种表达依赖于早期的听觉经验。同样，歌曲偏好既取决于听觉经验，也取决于对特定歌曲特征的先天偏好。我们探究了早期听觉经验和歌曲刺激类型对雌性斑胸草雀听觉前脑Zenk反应的影响。雌性斑胸草雀在三种不同的早期学习条件下饲养：唱单首歌曲的同种学习对象、异种学习对象，或唱野生型歌曲的同种学习对象。成年后，这些雌性斑胸草雀接受五种不同回放条件中的一种：野生型歌曲、单首歌曲、学习对象的歌曲、异种歌曲或白噪音。随后，测量了CMM和NCM中对ZENK呈免疫反应的细胞数量。我们预测，在生命早期接触同种歌曲且在成年期歌曲回放期间接触同种歌曲的鸟类，其神经反应最高。然而，我们发现，Zenk反应在不同的回放条件下有所不同，对同种野生型歌曲和同种单首歌曲的反应最高。此外，我们发现了学习条件的主要影响，由唱单首歌曲的雄性作为学习对象的雌性，其整体Zenk反应最低。最重要的是，存在显著的交互作用，即由野生型同种或异种歌曲作为学习对象的雌性，对斑胸草雀歌曲（野生型或单首）表现出类似的增强反应，但由单首歌曲作为学习对象的雌性，对同种歌曲没有差异反应，仅对它们所学习的特定歌曲表现出Zenk反应增强。综合来看，我们的结果表明，对同种歌曲元素的先天反应偏好取决于先前的听觉经验。也就是说，早期经验似乎会调节先天偏好的表达。
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