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1-Lecture_17 - Nissl stain – stains RNA blue(cell bodies...

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Lecture 17 – Notes We talked about the following patterns of song learning: 1. Memorization as juveniles, subsong as adults (chaffinch) 2. Memorization and subsong as juveniles (zebra finch) 3. Memorization and subsong as young adults (catbird) 4. Open learning and memorization Open learning differs from the others because there is not a clear sensitive period. There are not many true open learners – most simply have an extended period of sensitivity that does not last for a lifetime. Difficult to determine when the bird learned the song! Examples: Canary – extended sensitivity – can learn new songs for 2-3 years Mockingbird – may be a true open learner – may be able to learn for life! Neurological basis controlling the sensitive periods have not been studied. Neural link to repertoire size has been studied to a greater extent. How we study song nuclei: Brain sections
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Unformatted text preview: Nissl stain – stains RNA blue (cell bodies!) Congregations of cell bodies show up = nuclei! Most obvious comparison to make – those between singing and non-singing birds (males and females). Clear differences in size of the song nuclei. More comparisons made between males of the same species with variable repertoire sizes – again clear differences in size of HVC and RA. Further work done examining many species with varying repertoire sizes. Sizes of all brain areas were positively correlated with repertoire size. So – the more songs a bird can sing, the larger its song nuclei. Song repertoire sizes range among individuals, groups, geographic areas, and of course species. Starting with the most extreme examples, there is mimicry and imitation: MOCKINGBIRD EXAMPLE LYREBIRD EXAMPLE...
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1-Lecture_17 - Nissl stain – stains RNA blue(cell bodies...

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