Parallel negative feedback circuits in a higher olfactory center of the American cockroach

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  • ワモンゴキブリ高次嗅覚中枢の並列フィードバック抑制回路
  • ワモンゴキブリ コウジキュウカク チュウスウ ノ ヘイレツ フィードバック ヨクセイ カイロ

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Abstract

<p>Animals are required to process enormous and complex olfactory stimuli for their survival and reproductive success. Information processing along parallel pathways is a common feature of insect and mammal olfactory systems, suggesting that parallel subsystems are an effective way of fast and reliable olfactory processing. In this review, I give an overview of insect olfactory systems and introduce the structure of parallel olfactory processing streams of the American cockroach Periplaneta americana. In the cockroach, parallel nature of olfactory pathways has been known from the periphery to the higher-order center, the mushroom body. In addition, recently, simultaneous intracellular recordings/stainings from mushroom body output neurons and giant inhibitory neurons suggested parallel feedback pathways in the mushroom body. Odor-evoked responses of secondary olfactory neurons suggest that one of the parallel pathways processes odor-specific aspects while the other processes odor timing and concentration. The parallel feedback pathways may provide different forms of negative feedback for different classes of mushroom body intrinsic neurons, which process and represent different parameters of olfactory information.</p>

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