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    1. Computational and Systems Biology
    2. Neuroscience

    On the dimensionality of odor space

    Markus Meister
    A recent claim that humans can discriminate 1 trillion odors is found to be unwarranted, and further analysis offers insights into the dimensionality of olfactory perception.
    1. Neuroscience

    The contribution of temporal coding to odor coding and odor perception in humans

    Ofer Perl et al.
    Human participants fail to discriminate between odor sequences that activate the same neurons at different orders, pointing against a substantial role for neuron activation time in the odor code.
    1. Neuroscience

    Internal states drive nutrient homeostasis by modulating exploration-exploitation trade-off

    Verónica María Corrales-Carvajal et al.
    A quantitative video tracking analysis reveals that to gain the nutrients they need, flies change their decisions to exploit foods with different nutrient contents and explore the environment according to their internal amino acid and reproductive states.
    1. Neuroscience

    Activation of the dopaminergic pathway from VTA to the medial olfactory tubercle generates odor-preference and reward

    Zhijian Zhang et al.
    The VTA-mOT DAergic pathway mediates a variety of naturalistic reward processes and different types of preferences including odor-preference.
    1. Neuroscience

    Innate Behavior: Flies spring a surprise

    Johanna M Kobler, Ilona C Grunwald Kadow
    A combination of genetic, anatomical and physiological techniques has revealed that the lateral horn, a region of the brain involved in olfaction in flies, has many more types of neurons than expected.
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    1. Neuroscience

    Robust olfactory responses in the absence of odorant binding proteins

    Shuke Xiao et al.
    Although odorant binding proteins are widely believed to be required for transport of odorants to receptors, six types of sensilla of Drosophila respond robustly in their absence to many odor stimuli.
    1. Neuroscience
    2. Physics of Living Systems

    Walking Drosophila navigate complex plumes using stochastic decisions biased by the timing of odor encounters

    Mahmut Demir et al.
    Visualized odor encounters show that Drosophila navigate spatiotemporally complex odor plumes using random walks biased by the timing of brief and unpredictable odor encounters.
    1. Computational and Systems Biology
    2. Neuroscience

    Front-end Weber-Fechner gain control enhances the fidelity of combinatorial odor coding

    Nirag Kadakia, Thierry Emonet
    In multi-channel sensory systems, gain adaptation can help maintain not only coding capacity across changes in signal intensity, but also combinatorial representations of odor identity.
    1. Physics of Living Systems

    Adaptation of olfactory receptor abundances for efficient coding

    Tiberiu Teşileanu et al.
    A model of efficient coding by olfactory neurons explains context-dependence observed in the effect of perturbations to the olfactory environment.
    1. Neuroscience
    2. Plant Biology

    Hawkmoths evaluate scenting flowers with the tip of their proboscis

    Alexander Haverkamp et al.
    Building on previous work (Kessler et al., 2015), it is shown that long-tongued hawkmoths assess individual flowers by smelling floral odors with olfactory neurons on their proboscises, and that this close-range perception is crucial for successful pollination and foraging.