The Perception of a Rose

When I smell a rose, there is in this operation both sensation and perception. The agreeable odor I feel, considered by itself without relation to any external object, is merely a sensation. It affects the mind in a certain way; and this affection of the mind may be conceived without a thought of the rose, or any other object. This sensation can be nothing else than it is felt to be. Its very essence consists in being felt, and, when it is not felt, it is not. There is no difference between t...

 Scent on an Airless Planet

Scent seems to have all the disadvantages and none of the advantages, as a long-range sense. However, under special circumstances even a modified nose may fill the need. In a story of my own some years ago ("Uncommon Sense," Astounding Science Fiction, September 1945), I assumed an airless planet, so that molecules could diffuse in nearly straight lines. The local sense organs were basically pinhole cameras, with the retinal mosaic formed of olfactory cells. Since the beings in question were ...

 Scent as Data in a Beehive

To shield her antennae from the many bruising signals in the air, she walked with her head low. Air currents and electrical pulses from thousands of bees rippled against her, but Flora ignored them all. The pulsing track alone held her focus, clear and simple across the perilously busy lobby, where she had to slow down because of the tempest of data underfoot. A rush of workers came through in a tumult of scent and Flora lifted her head—then the rhythm of the foot-current drew her on. She ...

 There is No "Smell Pixel"

There is no way to interpolate between two smell molecules. True, odors can be mixed together to form millions of scents. But the world’s smells can’t be broken down into just a few numbers on a gradient; there is no “smell pixel.” Think of it this way: colors and sounds can be measured with rulers, but odors must be looked up in a dictionary.

 Dolphins have Genes for Smelling

Another curious tale of dead genes involves our sense of smell, or rather our poor sense of smell, for humans are truly bad sniffers among land mammals. Nevertheless, we can still recognize over 10,000 different odors. How can we accomplish such a feat? Until recently, this was a completely mystery. The answer lies in our DNA—in our many olfactory receptor (OR) genes. [...] Our own sense of smell comes nowhere close to that of mice. One reason is that we express fewer OR genes—only abou...

 The Importance of Smell and Taste in Infant Development

Olfactory recognition may also be the first step toward human bonding and attachment. As we've seen, newborns quickly learn and prefer the scent of their own mother or other caretaker. Nursing babies clearly have the richest olfactory experience, being bathed several times a day in the odors of their mother's milk and areolar secretions. Nonetheless, bottle-fed babies also can learn their parents' scents rather rapidly, depending on the amount and closeness of their contact. After the breast,...