Thursday, February 29, 2024

Chromatic Classification of Odor Identities


Scientists are smart - the way they figured this out is really clever, because they literally "blinded" the participants to the study; they're not asking you to tell them what color comes to mind, they ask you to just choose the neutral gray. This is how they figure out racial bias too:

Our sense of smell alters the colors we see, show scientists
Oct 2023, phys.org

"In a previous study, we had shown that the odor of caramel commonly constitutes a crossmodal association with dark brown and yellow, just like coffee with dark brown and red, cherry with pink, red, and purple, peppermint with green and blue, and lemon with yellow, green, and pink," explained Ward.

Ward and colleagues tested 24 adult women and men between 20 and 57 years of age with one of six odors chosen at random from caramel, cherry, coffee, lemon, and peppermint, plus odorless water as a control, and asked to manually adjust two sliders - one for yellow to blue, and another for green to red - to change its color to neutral gray. 

Participants had a weak but significant tendency to adjust one or both of the sliders too far away from neutral gray. For example, when presented with the odor of coffee, they wrongly perceived 'gray' to be more of a red-brown color than true neutral gray. 

An exception was when the odor of peppermint was presented: here, the participants' choice of hue was different from the typical crossmodal association demonstrated for the other odors. As expected, the participants' selection likewise corresponded to true gray when presented with the neutral scent of water. 

via John Moores University in Liverpool: Ryan J. Ward et al, Odors modulate color appearance, Frontiers in Psychology (2023). DOI: 10.3389/fpsyg.2023.1175703



Thursday, February 22, 2024

How Robots Will Learn to Smell


Parenting a 3-year-old robot
Aug 2023, phys.org

RoboAgent, an artificial intelligence agent that leverages passive observations and active learning to enable a robot to acquire manipulation abilities on par with a toddler. The team's agent learns through a combination of self-experiences and passive observations contained in internet data. As a parent would guide their child, researchers teleoperated the robot through tasks to provide it with useful self-experiences.

Our novel policy architecture allows our agents to reason even with limited experiences, using temporal chunks of movements instead of commonly used per-timestep actions, and learning from videos on the internet, akin to how babies acquire knowledge and behaviors by passively observing their surroundings.

via Carnegie Mellon University and Facebook: RoboAgent and RoboSet Project - Towards Sample Efficient Robot Manipulation with Semantic Augmentations and Action Chunking. Homanga Bharadhwaj et. al. 

Post Script: Partnership between Carnegie Mellon University and Meta, which is exactly how you wanted this to happen.


Thursday, February 15, 2024

Calling All Chemosignals


Chemical communication between female rats exists and is complex
Jun 2023, phys.org

I'm just here because today I learned that mice urine and rat urine are very different:

At this point, MUP (major urinary proteins) enter into play. MUPs are key in the transmission of odors through marks, yet function differently in mice (found in the urine with which they mark) as opposed to rats (whose marks contains sebaceous secretions, in addition to urine).

But the research found that a variety of these scent marking proteins came from the clitoral glands of the females, and we didn't know that before. ... the combination of urine and the secretion from the clitoral glands is necessary for the marks of the females to arouse interest in other females.

via University of Córdoba, University of Liverpool: Guadalupe Gómez-Baena et al, Unraveling female communication through scent marks in the Norway rat, Proceedings of the National Academy of Sciences (2023). DOI: 10.1073/pnas.2300794120

Post Script: Scent marking in rats has been studied in depth when it comes to males, but, in the case of females,  there's a knowledge gap.



Hand odor can reveal a person's sex, study shows
Jul 2023, phys.org
https://phys.org/news/2023-07-odor-reveal-person-sex.html

Statistical analysis and mass spectrometry analyze the volatile scent compounds present on the palms of 60 individuals - half male and half female predicted a person's sex with a 96.67% accuracy rate.
via Florida International University: Multivariate regression modelling for gender prediction using volatile organic compounds from hand odor profiles via HS-SPME-GC-MS, PLoS ONE (2023). DOI: 10.1371/journal.pone.0286452

Post Script: On Handshakes and Animal Behavior, 2021


Thursday, February 8, 2024

Flood the Dataspace


A new approach to warding off mice eating wheat seed using camouflage scents
May 2023, phys.org

Spraying wheat fields with wheat germ oil after seeding deters mice that feed on seeds.

Mice consume approximately 70 million tons of maize, rice and wheat grains each year around the globe

Colleagues in New Zealand had tried smearing the scents of endangered birds over areas where the birds would never visit. This led to predators growing suspicious of such scents, because when followed, there was no payoff. That led them to ignore the smell of the birds even when they were present.

To see if the approach might work with mice, the team treated 60 10x10 plots with wheat germ oil, which contains the scent of the wheat germ - the part of the wheat the mice want to eat. To gauge its effectiveness, the team sprayed it on plots before planting seeds and others after seeding. They also left a few plots untreated.

They were surprised to find that the oil did not serve as a false signal; the mice still ate the seeds where the plots had been pretreated. But they also found that the mice largely left alone the plots where treatment had occurred after planting. This, the researchers suggest, was likely because an overabundance of aroma had confused the mice, making it nearly impossible for them to find the seeds.

via University of Sydney: Finn C. G. Parker et al, Olfactory misinformation reduces wheat seed loss caused by rodent pests, Nature Sustainability (2023). DOI: 10.1038/s41893-023-01127-3

Post Script: In the modern world where we scavenge for data more than we do food, and in an effort to protect our own personal data, quite valuable in this modern world, we would call this "data poisoning," where you might use a different name every time you register for a webservice or purchase an e-ticket, filling the spreadsheet with similar but not the same names, confusing the predictive analytics machine with dirty data. On this note, one bonus we can expect from the deluge of artificially-generated digital detritus coming our way, is that it will fill the entire internet with fake people, which will fill the entire data-bundle of your favorite data broker with fake people, all with fake addresses and fake phone numbers and fake preferences for consumer products, and this will collapse the surveillance advertising industry.  


Thursday, February 1, 2024

Interpersonal Olfactory Intelligence


One of the few people who really understands the intersection of language and smell, and what they mean for the truly scientific pursuit of knowledge in a field of study that refuses to submit to objective observation --

Meditations on Scent With Andreas Keller, the Socrates of Smell
Mar 2023, High Snobiety

"It’s very difficult to find a middle ground in talking about smell that conveys what's interesting and fascinating to you in a way that other people can understand,” Keller notes. “The limited vocabulary, the differences in perception between people, the emotional connection to smells… One way is to describe what a smell does to you, how it makes you feel – but that probably tells us more about yourself than about the smell.”

Unrelated image credit: This is not a picture of Andreas Keller, and it's not even a real person, because it's artificially generated. It's a "Rave Party for Jesus Birthday." Also pay artists for their work.