ASTRO-110 Lecture Notes - Lecture 15: Biological Neural Network, Ciliary Muscle, Optical Illusion
22 Sep 2020
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Document Summary
There are two common type songbird species: age-limited learners and open- ended learners. Age specific learners once adult songs are crystalized, they remain unchanged for the rest of the bird"s life. Open ended learners are able to add new songs as they age. Birdsong is controlled by a neural circuit in the bird"s brain the brain to the syrinx on the same side. Descending motor pathway descends from the high vocal centre on each side of. Anterior forebrain pathway mediates song learning. The canary has a unique neural circuit that differs in 3 ways. The left descending motor pathway plays a more important role than the right, for singing. The high vocal centre is 4x larger in males than in females. Each spring the song control structures in the brain double in size only to shrink in the fall. Monozygotic twins develop from the same zygote and are genetically similar.
