Sensitization and Habituation of the Swimming Behavior in Ascidian Larvae to Light
Sensitization and Habituation of the Swimming Behavior in Ascidian Larvae to Light
复制标题
海鞘幼虫游泳行为对光的敏感和习惯
作者：
M. Tsuda;I. Kawakami;S. Shiraishi
摘要玻璃海鞘幼虫在发育过程中其光行为发生变化。新孵化的幼虫对任何强度的光刺激都没有反应。在孵化后4小时，幼虫被诱导开始游泳后停止照明，并停止游泳后开始照明。在较弱的光照强度（5.0×10−3 J/m2·s）下，幼虫对单一刺激或重复的光照开始和停止刺激表现出相似的反应，直到孵化后10小时。在更强的光强度（3.2×10−1 J/m2·s）下，当重复刺激时，它们表现出游泳反应的敏化和习惯化。在孵化后3小时，幼虫对任何强度的初始刺激都没有任何反应，但经过几次重复刺激（敏化）后，它们在4.0×10−2 J/m2·s以上的光强下表现出游泳反应。在5小时和强度高于1.0×10−2 J/m2·s时，幼虫对第一个刺激表现出光反应，但经过几次重复后，幼虫未能在光开始时停止游泳（习惯化）。一系列重复的刺激，在更强的光强度引起更大的习惯化，这种习惯化保留约1分钟。由于幼虫的中枢神经系统在玻璃海鞘是由只有约100个神经元，学习行为海鞘幼虫应提供见解的最小机制的记忆在脊椎动物。
Abstract Ascidian larvae of Ciona intestinalis change their photic behavior during the course of development. Newly hatched larvae show no response to a light stimulus at any intensity. At 4 hr after hatching, larvae were induced to start to swimming upon the cessation of illumination, and to stop swimming upon the onset of illumination. At a weaker light intensity (5.0×10−3 J/m2·s), the larvae showed similar responses to either a single stimulus or repeated stimuli of onset and cessation of light until 10 hr after hatching. At a stronger light intensity (3.2×10−1 J/m2·s), when the stimulus was repeated, they showed sensitization and habituation of the swimming response. At 3 hr after hatching the larvae failed to show any response to an initial stimulus at any intensity of light, but after several repeated stimuli (sensitization) they showed a swimming response at light intensities above 4.0×10−2 J/m2·s. At 5 hr and with intensity above 1.0×10−2 J/m2·s, the larvae showed photoresponses to the first stimulus, but after several repetitions the larvae failed to stop swimming upon the onset of light (habituation). A repeated series of stimuli at stronger intensities of light caused greater habituation; this habituation was retained for about 1 min. Since the larval central nervous system in Ciona is comprised of only about 100 neurons, learning behavior in ascidian larvae should provide insights for a minimal mechanism of memory in vertebrates.
嗜盐杆菌趋光性中的激发信号处理时间。
影响因子：
3.4
作者：
Sundberg,SA;Alam,M;Spudich,JL
通讯作者：
Spudich,JL