Animals can discriminate between olfactory stimuli, but they perceive different concentrations of a chemical as one stimulus. A recent study suggests how this happens and reveals a neural circuit that mediates olfactory gain control.
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Strowbridge, B. A volume control for the sense of smell. Nat Neurosci 11, 531–533 (2008). https://doi.org/10.1038/nn0508-531
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DOI: https://doi.org/10.1038/nn0508-531