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Ploskim črvom so odsekali glave, spomin je ostal

Ploskim črvom so odsekali glave, spomin je ostal

T-h-o-r ::

http://newswatch.nationalgeographic.com...

http://jeb.biologists.org/content/early...

In French Revolution-style, researchers decapitated flatworms—then did something that would give even Madam Defarge the creeps.

The scientists let the worms’ heads grow back and found that their memories returned along with the new noggins, according to a new study in the Journal of Experimental Biology.
Why have a civilization anymore
if we no longer are interested in being civilized?

gruntfürmich ::

mislim da pri praktično vsem živem svetu ni posebne znanosti glede 'pameti': vsi se ravnajo po zakonih difuzije, prehoda snovi; pač od nižje koncentracije snovi k višji. samo receptorji, izvrševalci in povezava morajo ostati pa stvar funkcionira. še pri človeku morda v veliki meri!
"Namreč, da gre ta družba počasi v norost in da je vse, kar mi gledamo,
visoko organizirana bebavost, do podrobnosti izdelana idiotija."
Psiholog HUBERT POŽARNIK, v Oni, o smiselnosti moderne družbe...

zee ::

Kolikor vem ploski crvi nimajo glave.
zee
Linux: Be Root, Windows: Re Boot
Giant Amazon and Google Compute Cloud in the Sky.

driver_x ::

zee je izjavil:

Kolikor vem ploski crvi nimajo glave.


seveda da ne, saj so jim jo odrezali :D

V članku omenjajo, da imajo možgane in primitivne oči.

Mipe ::

Bo kar oboje primitivno. Nekatere vrste ploskih črvov niti nimajo možganov.

vostok_1 ::

Kolikor vem se temu reče malo bolj kompleksni gangliji. Ali ne?

gzibret ::

zee je izjavil:

Kolikor vem ploski crvi nimajo glave.


Bravo! Nekateri imajo toliko znanja, da jim sploh ni treba brati izvorne novice, da lahko komentirajo in sesujejo celo stvar. Res, kapo dol!

Iz izvorne novice:

The team turned to flatworms because, despite their relative simplicity, they have many of the same organs and body organization as people: a brain and nervous system, bilateral symmetry, and even some of the same behaviors.


Torej, odrezali so jim možgane, če že hočeš biti picajzlast. Glave pa res nimajo, ampak izvorna novica pravi, da so jih "decapitated", kar po slovensko pomeni, obglavili. Morda bi National Geographic moral napisati "debrainated" ;)

Drugače pa... zanimivo. Spomin je torej porazdeljen širše. kot smo mislili do sedaj. Zanimivi so tudi tisti (človeški) primeri, ko so doživeli možgansko kap. Še vedno se spomnijo vse, čeprav manj podrobno, kljub temu, da imajo pol možgan nefunkcijonalnih.
Vse je za neki dobr!

Mipe ::

To bo zato, ker so možgani le del večjega nevronskega sistema v telesu. Človek, na primer, ima okoli 20 milijard nevronov, ki sestavljajo možgane. Vseh nevronov skupaj pa je (menda) 85 milijard, se pravi, da ima rezerve še za tri možgane.

Seveda pa je zadeva precej bolj kompleksna; brez možganov, ki so nekakšen kontrolni center živčevja, človek pač ne more normalno "delovati". Lahko samo vegetira v komi.

Če bi pa lahko na ta način, kot pri ploskih črvih, med komo obnovili možgane...

Zgodovina sprememb…

  • spremenil: Mipe ()

dstr17_ ::

vir: Wikipedia
At the head of the planarian there is a ganglion under the eyespots. This bi-lobed mass of nerve tissue, the cerebral ganglia, is sometimes referred to as the planarian brain[6] and has been shown to exhibit spontaneous electrophysiological oscillations,[7] similar to the electroencephalographic (EEG) activity of other animals.
Planarian @ Wikipedia
Niso ravno možgani, prej malo večji ganglij, ki spominja na aktivnost v možganih. Sicer vseeno zanimivo.

Zgodovina sprememb…

  • zavarovalo slike: gzibret ()

msjr ::

dstr17_ je izjavil:

Planarian @ Wikipedia


Blazno zanimivo, in kot vidim že dolgo eksperimentirajo s temile črvički:

In 1955, Robert Thompson and James V. McConnell conditioned planarian flatworms by pairing a bright light with an electric shock. After repeating this several times they took away the electric shock, and only exposed them to the bright light. The flatworms would react to the bright light as if they had been shocked. Thompson and McConnell found that if they cut the worm in two, and allowed both worms to regenerate each half would develop the light-shock reaction. In 1962, McConnell repeated the experiment, but instead of cutting the trained flatworms in two he ground them into small pieces and fed them to other flatworms. He reported that the flatworms learned to associate the bright light with a shock much faster than flatworms who had not been fed trained worms.

This experiment intended to show that memory could be transferred chemically. The experiment was repeated with mice, fish, and rats, but it always failed to produce the same results.

Okapi ::

In 1962, McConnell repeated the experiment,


Bravo, so šli ponavljati 50 let stare poskuse, ki že takrat niso dali nobenih pravih rezultatov, razen senzacionalističnih časopisnih člankov.>:D

Tale prispevek in komentarji nanj je iz leta 2000.
http://everything2.com/title/The+abilit...

In the interests of maintaining high scientific standards, I feel obligated to note that before the cold fusion debacle, McConnell's planaria study was the standard by which Bad Science was judged.

"McConnell's research program with planaria collapsed when other scientists failed to replicate the phenomenon of memory transfer." -- American Psychologist 51:589-598.

McConnell's results on transferred memories did not hold up. A great discussion of the failure of McConnell's research can be found in The Making of Memory: From Molecules to Mind by Steven Rose (1993, ISBN 0385471211).

korenje3 ::

kaj se je pa zgodilo z odrezano glavo? ji je zrasel trup?
i9-12900k; 32GB DDR5-6000 CL36; Nvidia RTX 3080 ti;
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