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首页> 外文期刊>Journal of Neurophysiology >Model for olfactory discrimination and learning in Limax procerebrum incorporating oscillatory dynamics and wave propagation.
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Model for olfactory discrimination and learning in Limax procerebrum incorporating oscillatory dynamics and wave propagation.

机译：结合振荡动力学和波传播的Limax大脑嗅觉辨别和学习模型。

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摘要

We extend our model of the procerebral (PC) lobe of Limax, which is comprised of a layer of coupled oscillators and a layer of memory neurons, each layer 4 rows by 20 columns, corresponding to the cell body layer (burster cells) and neuropil layer (nonburster cells) of the PC lobe. A gradient of connections in the layer of model burster cells induces periodic wave propagation, as measured in the PC lobe. We study odor representations in the biological PC lobe using the technique of Kimura and coworkers. Lucifer yellow injection into intact Limax after appetitive or aversive odor learning results in a band or patch of labeled cells in the PC lobe with the band long axis normal to the axis of wave propagation. Learning two odors yields two parallel bands of labeled PC cells. We introduce olfactory input to our model PC lobe such that each odor maximally activates a unique row of four cells which produces a short-term memory trace of odor stimulation. A winner-take-all synaptic competition enabled by collapse of the phase gradient during odor presentation produces a single short-term memory band for each odor. The short-term memory is converted to long-term memory if odor stimulation is followed by activation of an input pathway for the unconditioned stimulus (US) which presumably results in release of one or more neuromodulatory amines or peptides in the PC lobe.
机译：我们扩展了Limax的前脑（PC）叶片模型，该模型由一层耦合的振荡器和一层记忆神经元组成，每一层4行乘20列，分别对应于细胞体层（突发细胞）和Neuropil PC肺叶层（非突发细胞）。如在PC瓣中所测量的，模型爆破细胞层中的连接梯度会引起周期性波传播。我们使用Kimura和同事的技术研究生物PC瓣中的气味表示。经过学习性或厌恶性气味后，将荧光素黄注射到完整的Limax中会导致PC瓣中标记细胞的条带或斑块，其条带长轴垂直于波传播轴。学习两种气味会产生两条平行的标记PC细胞带。我们将嗅觉输入引入模型PC瓣，以使每种气味最大程度地激活四个细胞的唯一行，从而产生气味刺激的短期记忆痕迹。气味呈现过程中相位梯度的崩溃使获胜者通吃的突触竞争为每种气味产生了一个短期记忆带。如果在刺激气味后激活无条件刺激（US）的输入途径，则短期记忆将转换为长期记忆，这可能会导致PC叶中一种或多种神经调节胺或肽的释放。

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