Johnson Frank, Soderstrom Ken, Whitney Osceola
Department of Psychology and Program in Neuroscience, Florida State University, Tallahassee, FL 32306-1270, USA.
Behav Brain Res. 2002 Apr 1;131(1-2):57-65. doi: 10.1016/s0166-4328(01)00374-6.
Using an event-triggered recording system, the quantity of daily song bout production was measured weekly in male zebra finches (Taeniopygia guttata) during sensory-motor learning and at one year of age. Our aim was to ask whether the development of a stereotyped vocal pattern involves a practice-driven component. If so, we hypothesized that juvenile males learning song should sing more often than adults reciting a vocal pattern they had already learned, and that greater levels of juvenile singing should be associated with improvement in the quality of the adult song. Across the period measured (36-365 days of age), subjects showed an inverted U-shaped pattern of daily song bout production. Song bout production was lowest during subsong, with increased production associated with plastic song and song crystallization, although individual differences were large. Daily song bout production decreased in adulthood. Higher levels of song bout production during plastic song correlated with fewer sequencing errors in adult song patterns (r(2)=0.77). In contrast, quantity of singing during song crystallization showed no relationship to vocal stereotypy (r(2)=0.002). Our data suggest a sensitive period for vocal practice during zebra finch sensory-motor learning with consequences for the note-sequence fidelity of the adult vocal pattern.
利用事件触发记录系统，在雄性斑胸草雀（Taeniopygia guttata）的感觉运动学习期间以及一岁时，每周测量其每日鸣唱回合的数量。我们的目的是探究刻板发声模式的发展是否涉及练习驱动的成分。如果是这样，我们假设学习鸣唱的幼年雄性比背诵已学发声模式的成年雄性唱歌更频繁，并且幼年时期更高水平的歌唱应与成年歌曲质量的提高相关。在所测量的时期（36至365日龄）内，研究对象表现出每日鸣唱回合数量呈倒U形的模式。在亚鸣唱阶段，鸣唱回合数量最低，随着可塑性鸣唱和鸣唱固化，鸣唱回合数量增加，尽管个体差异很大。成年后，每日鸣唱回合数量减少。可塑性鸣唱期间较高水平的鸣唱回合数量与成年歌曲模式中较少的序列错误相关（r(2)=0.77）。相比之下，鸣唱固化期间的歌唱数量与发声刻板性无关（r(2)=0.002）。我们的数据表明，斑胸草雀感觉运动学习期间存在一个对发声练习敏感的时期，这对成年发声模式的音符序列保真度有影响。
