Why do mice sniff?
Mice can sense extremely fast and subtle changes in the structure of odours and use this to guide th Read More
Why do we need to sniff to smell?
George Wuckert
2025-08-01 09:42:16
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Sniffing will activate “chocolate” and “non-chocolate” glomeruli. From the brain’s point of view, how can it tell whether the signals it receives from the glomeruli contain air-flow information or odor information? The answer is all about timing. Temporal firing patterns of neurons can distinguish between airflow-driven mechanical signals and those generated by odors. Not only that, mechanosensation actually improves olfaction by acting as a pacemaker for temporal patterning. But why are neurons in the nose sensitive to air pressure at all? They found that continuous airflow reduced the precision of the phase code, especially at low odor concentrations, which would make it more difficult to distinguish one odor from another.
Lance Reinger
2025-07-23 10:24:04
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This finding, plus the fact that both types of stimuli produce reaction in olfactory nerve cells, which control how our brain perceives what we smell, explains why we sniff to smell something, and why our sense of smell is synchronized with inhaling. The mechanosensitivity of our olfactory neurons has two possible functions, suggest the investigators. The first is that it increases our ability to smell, enhancing the detection of odorous molecules in the air. The second is a peripheral drive in the brain to synchronize rhythmic activity, which is the concurrent firing of neurons in the olfactory bulb with breathing. It helps the brain make better sense out of odor responses when it integrates airflow information. We still don't know how it happens, but sniffing is essential for odor perception.
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What smell are rats afraid of?
Rats in London particularly dislike strong odors, especially those of certain essential oils like pe Read More
Cheyenne Cronin
2025-07-23 07:01:10
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: 21
When sniffing a flower, odour molecules from it are drawn to the top of the nose, or olfactory cleft, as we breathe in. They then dissolve in a layer of mucus membrane known as the olfactory epithelium. This ‘drawing in’ of air is aided by the turbinates; bony cushions inside the nose which not only help direct the airflow but also warm, humidify and filter the air as it passes over them. Sniffing improves this process by increasing the flow of air. Once the odour molecules have dissolved in the mucus, they spread through it and attach to hair-like structures called cilia. The cilia are attached to receptor cells. Sniffing is essentially necessary to draw the odour molecules into the nose to start this process.