# behav: ADHD may have been a feature of nomadic exploration among hunter-gatherer societies

<< All mobile organisms forage for resources, choosing how and when to search for new opportunities by comparing current returns with the average for the environment. In humans, nomadic lifestyles favouring exploration have been associated with genetic mutations implicated in attention deficit hyperactivity disorder (ADHD), inviting the hypothesis that this condition may impact foraging decisions in the general population. >>️

David L. Barack, Vera U. Ludwig, et al. 

Attention deficits linked with proclivity to explore while foraging. Proc Royal Society B.  doi: 10.1098/ rspb.2022.2584. Feb 21, 2024. 

https://doi.org/10.1098/rspb.2022.2584     

<< Is it a legacy of the hunter-gatherer world? >> Arjun Ramakrishnan

Chen Ly. ADHD may have evolved to help foragers know when to cut their losses. newscientist.com Feb 21,2024.

https://www.newscientist.com/article/2418114-adhd-may-have-evolved-to-help-foragers-know-when-to-cut-their-losses

Also: nomads, bushmen, behav, uncertainty, curiosity, in https://www.inkgmr.net/kwrds.html

Keywords: adhd, nomads, hunter-gatherers, behavior, behaviour

# life: hypothetical 'subtle variations' about three ancient neuro-cognitive models, the nomadic explorer, the nomadic owner, the farmer.

<< Prehistoric humans underwent three major migration events across Eurasia, influencing the genetic diversity of present-day Europe. These include the arrival of hunter-gatherers approximately 45,000 years ago, the expansion of Neolithic farmers from the Middle East around 11,000 years ago, and the rise of animal husbandry when steppe pastoralists migrated from the Pontic Steppe approximately 5,000 years ago. Each of these events represents a crucial period in human history that has shaped the genetic diversity observed in present-day Europe, although specific genetic and demographic details remain poorly characterized. >>️

Michael Attwaters. Ancient migration and the modern genome. Nat Rev Genet 25, 162. Feb 5, 2024. 

https://www.nature.com/articles/s41576-024-00702-4

Also: nomad, ctz entity, in https://www.inkgmr.net/kwrds.html

Keywords: life, hunter-gatherers, pastoralists, farmers

# life; a hypothetical externalization of knowledge effects; humans are thought to have decreased in brain volume since the end of the last ice age (3,000 y.ago)

<< Human brain size nearly quadrupled in the six million years since Homo last shared a common ancestor with chimpanzees, but human brains are thought to have decreased in volume since the end of the last Ice Age. The timing and reason for this decrease is enigmatic. Here (AA) use change-point analysis to estimate the timing of changes in the rate of hominin brain evolution. (They) find that hominin brains experienced positive rate changes at 2.1 and 1.5 million years ago, coincident with the early evolution of Homo and technological innovations evident in the archeological record. But (AA) also find that human brain size reduction was surprisingly recent, occurring in the last 3,000 years. >>

Jeremy M. DeSilva, James F. A. Traniello, et al. When and Why Did Human Brains Decrease in Size? A New Change-Point Analysis and Insights From Brain Evolution in Ants. Front. Ecol. Evol.,  doi: 10.3389/ fevo.2021.742639. Oct 22, 2021. 

https://www.frontiersin.org/articles/10.3389/fevo.2021.742639/full

When and why did human brains decrease in size 3,000 years ago? Ants may hold clues. Frontiers. Oct 22, 2021.

https://phys.org/news/2021-10-human-brains-decrease-size-years.html

Also

keyword 'nomade' | 'nomad' | 'nomads' | 'nomadic' | 'hunter-gatherers' in FonT

https://flashontrack.blogspot.com/search?q=nomade

https://flashontrack.blogspot.com/search?q=nomad

https://flashontrack.blogspot.com/search?q=nomads

https://flashontrack.blogspot.com/search?q=nomadic

https://flashontrack.blogspot.com/search?q=hunter-gatherers

keyword 'nomade' | 'nomadi' in Notes (quasi-stochastic poetry)

https://inkpi.blogspot.com/search?q=nomade

https://inkpi.blogspot.com/search?q=nomadi

keyword 'ctz' entities in FonT

https://flashontrack.blogspot.com/search?q=ctz

keywords: evolution, brain, brain size, nomads, post-nomads, sociocultural effects

# art: Nomadic masters; Neanderthals created art.

AA << analysed samples of red residues collected from the flowstone surface and compared them with iron oxide-rich deposits in the cave. They concluded that the ochre-based pigment was intentionally applied, i.e. painted -- by Neanderthals, as modern humans had yet to make their appearance on the European continent -- and that, importantly, it had probably been brought to the cave from an external source. >>

<< variations in pigment composition between samples were detected, corresponding to different dates of application, sometimes many thousands of years apart. Thus, it seems that many generations of Neanderthals visited this cave and coloured the draperies of the great flowstone formation with red ochre. >>

<< This behaviour indicates a motivation to return to the cave and symbolically mark the site, and it bears witness to the transmission of a tradition down through the generations. >>

Neanderthals indeed painted Andalusia’s Cueva de Ardales. CNRS. 

Aug 2, 2021. 

https://www.sciencedaily.com/releases/2021/08/210802160624.htm

Africa Pitarch Marti, Joao Zilhao, et al. The symbolic role of the underground world among Middle Paleolithic Neanderthals. PNAS. 118 (33) e2021495118; doi: 10.1073/ pnas.2021495118. Aug 17, 2021. 

https://www.pnas.org/content/118/33/e2021495118  

# life: Nomadic masters, ancient people ate bread, beer and other carbs, long before domesticated crops

<< it has become clear that early humans were cooking and eating carbs almost as soon as they could light fires. >>

<< These are the best grinding tools ever, and I’ve seen a lot of grindstones, (..) People at Göbekli Tepe knew what they were doing, and what could be done with cereals. They’re beyond the experimentation phase. >> Laura Dietrich.

️

<< The old-fashioned idea that hunter-gatherers didn’t eat starch is nonsense, >> Dorian Fuller.️

Andrew Curry. How ancient people fell in love with bread, beer and other carbs. Well before people domesticated crops, they were grinding grains for hearty stews and other starchy dishes. Nature 594, 488-491. doi: 10.1038/ d41586-021-01681-w. Jun 22, 2021.

https://www.nature.com/articles/d41586-021-01681-w

Audio long-read: How ancient people learned to love carbs. Nature Podcast 

Jul 26, 2021.

https://www.nature.com/articles/d41586-021-01998-6?

# life: exchange of nomadic music in the sea, male fin whales swap songs

<< Until now, scientists believed the male fin whale sings just one song pattern, which is unique to the males in his particular group—but new research has blown this theory out of the water. This study, (..) suggests that these endangered deep-sea giants actually sing multiple different songs, which may spread to different parts of the ocean through migrating individuals. >>

Male fin whales surprise scientists by swapping songs. Frontiers. Oct 29, 2020. 

https://phys.org/news/2020-10-male-fin-whales-scientists-swapping.html  

Tyler A. Helble, Regina A. Guazzo, et al.  Fin Whale Song Patterns Shift Over Time in the Central North Pacific. Front. Mar. Sci. doi: 10.3389/ fmars.2020.587110. Oct 29, 2020. 

https://www.frontiersin.org/articles/10.3389/fmars.2020.587110/full    

# astro: oops? apropos of rapid expansion of trajectories, the nomadic escape propensity of Titan.

As a vision of a fuzzy snooker, << decades of measurements and calculations have revealed that Titan's orbit around Saturn is expanding- meaning, the moon is getting farther and farther away from the planet- at a rate about 100 times faster than expected. The research suggests that Titan was born much closer to Saturn and migrated out to its current distance of 1.2 million kilometers (about 746,000 miles) over 4.5 billion years. >>

<< Titan is expected to gravitationally squeeze Saturn with a particular frequency that makes the planet oscillate strongly, similarly to how swinging your legs on a swing with the right timing can drive you higher and higher. This process of tidal forcing is called resonance locking. Fuller (Jim Fuller) proposed that the high amplitude of Saturn's oscillation would dissipate a lot of energy, which in turn would cause Titan to migrate outward away from the planet at a faster rate than previously thought. >>

<< The resonance locking theory can apply to many astrophysical systems. I'm now doing some theoretical work to see if the same physics can happen in binary star systems, or exoplanet systems, >> Jim Fuller.

Lori Dajose. Titan is migrating away from Saturn 100 times faster than previously predicted. Jun 8, 2020.

https://phys.org/news/2020-06-titan-migrating-saturn-faster-previously.html

Valery Lainey, Luis Gomez Casajus, et al. Resonance locking in giant planets indicated by the rapid orbital expansion of Titan. Nat Astron. doi: 10.1038/ s41550-020-1120-5. Jun 8, 2020.

https://www.nature.com/articles/s41550-020-1120-5   

Also (quasi-stochastic poetry)

1648b - tenuta di rigo della sonda. Notes. Jan 15, 2005.

https://inkpi.blogspot.com/2005/01/1648b-tenuta-di-rigo-della-sonda.html

# behav: nomadic impulse, they return to Death Valley

<< More than a century after railroads, ranchers and hunters vanquished their ancestors, pronghorn antelope are returning to this unforgiving expanse of desert along the California-Nevada border. >>

<< the American pronghorn, North America's land speed champion, may be extending its migratory range into the Mojave Desert once again from cooler seas of sage nearly 100 miles to the north and east. >>

Louis Sahagun. Desert mystery: Why have pronghorn antelope returned to Death Valley? May 13, 2020.

https://phys.org/news/2020-05-mystery-pronghorn-antelope-death-valley.html

# acad: apropos of pulsating, nomadic entities; to generate and manage 'theories and vagrant thoughts', by Isaac

<< Presumably, the process of creativity, whatever it is, is essentially the same in all its branches and varieties, so that the evolution of a new art form, a new gadget, a new scientific principle, all involve common factors. We are most interested in the “creation” of a new scientific principle or a new application of an old one, but we can be general here. >>

Isaac Asimov Asks, "How Do People Get New Ideas?". A 1959 Essay by Isaac Asimov on Creativity. Oct 20, 2014.

https://www.technologyreview.com/s/531911/isaac-asimov-asks-how-do-people-get-new-ideas/amp/

https://twitter.com/techreview/status/1147256914016964608

# life: nomadism revisited: the lifestyle of the grey nomads

<< They are two of tens of thousands of retired adults travelling independently across the continent at any given time in search of adventure, warmer weather and camaraderie after a lifetime of hard work. These part-time nomadic adventurers, or grey nomads, have recast the image of Australia’s ageing population. Rather than being inert and conservative, or in need of care, these older Australians are champions of a radical type of urbanism: dwellings are mobile, infrastructure is portable or pluggable, social networks are sprawled, and adherents are on the move daily or weekly. >>

Timothy Moore. Grey nomad lifestyle provides a model for living remotely.
Monash University. Dec 9, 2018.

https://theconversation.com/grey-nomad-lifestyle-provides-a-model-for-living-remotely-106074

https://m.phys.org/news/2018-12-grey-nomad-lifestyle-remotely.html 

# evol: dry, chaotic environment in the transition to modern (nomadic) humans

<< A progressively drying climate punctuated by variable wetter episodes may have precipitated the transition from our hominin ancestors to anatomically modern humans >>

Dryer, less predictable environment may have spurred human evolution. University of Arizona. Oct 8, 2018.

https://m.phys.org/news/2018-10-dryer-environment-spurred-human-evolution.html

R. Bernhart Owen, Veronica M. Muiruri, et al. Progressive aridification in East Africa over the last half million years and implications for human evolution. PNAS Oct 8, 2018 doi: 10.1073/pnas.1801357115 

http://www.pnas.org/content/early/2018/10/03/1801357115

# game: where cooperation is flexible, not fixed

<<
- Assortment on cooperation is a characteristic feature of hunter-gatherer life
- Assortment persists despite substantial migration and residential mixing
- No evidence for stable social types or a preference to live with cooperators
- Individuals respond in kind to the cooperative behavior of their group members
>>

Kristopher M. Smith, Tomas Larroucau, et al.  Hunter-Gatherers Maintain Assortativity in Cooperation despite High Levels of Residential Change and Mixing. Curr Biol doi: 10.1016/j.cub.2018.07.064 Sep 20, 2018.

https://www.cell.com/current-biology/fulltext/S0960-9822(18)30994-1

Nomadic hunter-gatherers show that cooperation is flexible, not fixed. University of Pennsylvania.  Sep 20, 2018.

https://m.phys.org/news/2018-09-nomadic-hunter-gatherers-cooperation-flexible.html

# s-evol: nomadic pulses: when dinosaurs ruled the earth, they took to the skies ...

<< New fossil discoveries show that prehistoric “squirrels” glided through forests at least 160 million years ago, long before scientists had thought >>

<< In a study published on Wednesday, a team of paleontologists added some particularly fascinating new creatures to the Mesozoic Menagerie. These mammals did not lurk in the shadows of dinosaurs >>

Carl Zimmer. When Dinosaurs Ruled the Earth, Mammals Took to the Skies. August 9, 2017

https://mobile.nytimes.com/2017/08/09/science/dinosaurs-flying-mammals-squirrels.html

https://twitter.com/NYTScience/status/895359121943351296

<< Two new eleutherodonts from the Late Jurassic period have skin membranes and skeletal features that are adapted for gliding >>

Qing-Jin Meng,David M. Grossnickle, et al. New gliding mammaliaforms from the Jurassic. Nature  (2017) doi:10.1038/nature23476 Publ. Aug 09, 2017
   
http://www.nature.com/nature/journal/vaop/ncurrent/full/nature23476.html