Alternation emerges as a multi-modal strategy for turbulent odor navigation.
Alternation emerges as a multi-modal strategy for turbulent odor navigation.
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交替出现作为一个多模态的湍流气味导航策略。
DOI：
10.7554/elife.76989
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发表时间：
2022-08-23
期刊：
影响因子：
7.7
通讯作者：
Vergassola, Massimo
中科院分区：
文献类型：
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作者：
Rigolli, Nicola;Reddy, Gautam;Seminara, Agnese;Vergassola, Massimo
觅食的哺乳动物表现出一种熟悉但鲜为人知的现象，即“交替”，即先停下来嗅空气，然后动物用后腿站立或抬起头。啮齿动物在气流存在的情况下会自发地交替，这表明交替在羽流跟踪过程中发挥着重要作用。为了检验这一假设，我们结合了湍流气味传输的完全解析模拟和贝尔曼优化方法，以在部分可观测性下进行决策。我们表明，经过训练以最大限度地减少在真实气味羽流中的搜索时间的代理表现出广泛的交替以及在昆虫中观察到的特征性投射和浪涌行为。交替与投射有关，并且更频繁地发生在源的下风处，在那里检测到空中线索的可能性相对于地面线索更高。选角和交替成为利用稀疏线索进行有效探索的补充工具。基于边际价值理论的模型捕捉了铸造、涌动和交替之间的相互作用。
Foraging mammals exhibit a familiar yet poorly characterized phenomenon, ‘alternation’, a pause to sniff in the air preceded by the animal rearing on its hind legs or raising its head. Rodents spontaneously alternate in the presence of airflow, suggesting that alternation serves an important role during plume-tracking. To test this hypothesis, we combine fully resolved simulations of turbulent odor transport and Bellman optimization methods for decision-making under partial observability. We show that an agent trained to minimize search time in a realistic odor plume exhibits extensive alternation together with the characteristic cast-and-surge behavior observed in insects. Alternation is linked with casting and occurs more frequently far downwind of the source, where the likelihood of detecting airborne cues is higher relative to ground cues. Casting and alternation emerge as complementary tools for effective exploration with sparse cues. A model based on marginal value theory captures the interplay between casting, surging, and alternation.