FREQUENCY CODING BY CENTRAL OLFACTORY NEURONS IN THE SPHINX MOTH MANDUCA-SEXTA
FREQUENCY CODING BY CENTRAL OLFACTORY NEURONS IN THE SPHINX MOTH MANDUCA-SEXTA
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DOI：
10.1093/chemse/13.1.123
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发表时间：
1988-03-01
期刊：
影响因子：
3.5
通讯作者：
HILDEBRAND, JG
中科院分区：
文献类型：
--
作者：
CHRISTENSEN, TA;HILDEBRAND, JG
交配期的雌性飞蛾和许多其他昆虫释放化学引诱剂（性信息素）来引诱同种的配偶。此外，最近的证据表明，在雌性下风处形成的气味羽状物具有不连续的结构，似乎为寻找的雄性提供了方向线索。利用细胞内方法，我们发现雄性飞蛾（Manduca sexta）的许多中枢嗅觉神经元可以精确地跟踪脉冲费洛蒙刺激。细胞对每一个短暂的气味脉冲都有一个类似的短暂的动作电位爆发，而反应爆发之间的分离是由抑制性突触输入辅助的。此外，这些神经元似乎参与了至少两个层面的“特征检测”：它们对信息素刺激有选择性地做出反应，它们只在有限的频率范围内跟随脉冲刺激。在频率限制以上，细胞的反应就好像雄性受到了长时间、均匀浓度的信息素的刺激。这些神经元对信息素刺激的时间特征的变化进行编码的能力可能为雄性提供位置线索，帮助他在远距离上定位信息素的来源。
Sexually receptive female moths and many other insects release chemical attractants (sex pheromones) to lure conspecific mates. Recent evidence indicates, moreover, that the odor plume formed downwind from the female possesses a discontinuous structure that appears to provide the searching male with orientation cues. Using intracellular methods, we find that many central olfactory neurons in male moths (Manduca sexta) can track pulsed pheromonal stimuli precisely. The cells respond to each brief odor pulse with a similarly brief burst of action potentials, and the separation between response bursts is aided by inhibitory synaptic input. Furthermore, these neurons appear to participate in at least two levels of ''feature detection'': they respond selectively to pheromonal stimuli, and they follow pulsed stimulation only in a limited range of frequencies. Above the frequency limit, the cells respond as if the male is stimulated by a prolonged, uniform concentration of pheromone. The ability of these neurons to encode changes in the temporal characteristics of pheromonal stimuli may provide the male with positional cues to help him locate the pheromone source over long distances.