Early Experiments Discover Lateralization
Lateral dominance of the hypoglossal nerve conveying messages from the brain to the syrinx was first observed in the 1970s. This lateral dominance was determined in a breed of canary, the waterschlager canary, bred for its long and complex song, by lesioning the ipsilateral tracheosyringeal branch of the hypoglossal nerve, disabling either the left or right syrinx. The numbers of song elements in the birds’ repertoires were greatly attenuated when the left side was cut, but only modestly attenuated when the right side was disabled, indicating left syringeal dominance of song production in these canaries. Similar lateralized effects have been observed in other species such as the white-crowned sparrow (Zonotrichia leucophrys), the Java sparrow (Lonchura oryzivora) and the zebra finch (Taeniopygia guttata), which is right-side dominant. However, denervation in these birds does not entirely silence the affected syllables but creates qualitative changes in phonology and frequency.
Read more about this topic: Lateralization Of Bird Song
Famous quotes containing the words early, experiments and/or discover:
“Early education can only promise to help make the third and fourth and fifth years of life good ones. It cannot insure without fail that any tomorrow will be successful. Nothing “fixes” a child for life, no matter what happens next. But exciting, pleasing early experiences are seldom sloughed off. They go with the child, on into first grade, on into the child’s long life ahead.”
—James L. Hymes, Jr. (20th century)
“My experiments did not turn out quite like yours, Henry. But science, like love, has her little surprises.”
—William Hurlbut (1883–?)
“Nothing is ever simple. What do you do when you discover you like parts of the role you’re trying to escape?”
—Marilyn French (b. 1929)