Vi siete mai chiesti perché ci si gratta? Ma soprattutto perché, dopo, si prova un senso di piacere così gratificante?

La risposta proviene da studi abbastanza recenti (2009) effettuati dall’Università del Minnesota e pubblicati su Nature Neuroscience. I ricercatori affermano che la colpa del prurito sarebbe da attribuire ad alcuni neuroni “speciali”, una sorta di “neuroni del prurito” localizzati nel tratto ipotalamico della colonna vertebrale (Spinothalamic Tract Neurons). Quando la pelle è sottoposta a sostanze irritanti, tali neuroni diventano iperattivi e producono sostanze per la trasmissione della sensazione di prurito stessa, che ci spinge a grattarci e a rilassare tali neuroni “impazziti”.

Ma perché tutto ciò ci provoca sollievo? Se lo sono chiesti anche i ricercatori del Wake Forest University Baptist Medical Center, che con tecniche di brain imaging, hanno osservato cosa accade nel cervello di una persona che si gratta in risposta al prurito. È stato osservato che le aree del cervello associate a ricordi traumatici o comunque a esperienze dolorose vengono meno stimolate mentre ci si gratta. Tali aree corrispondono al cingolato anteriore (associata alle esperienze sensoriali poco gradite) e il cingolato posteriore (associata alla memoria). È un po’ come se ci dimenticassimo dei nostri problemi.
Lo studio ha inoltre evidenziato altre aree diventano iperattive durante l’atto: la corteccia somatosensoriale secondaria (attiva nella sensazione di dolore) e la corteccia prefrontale (associata a il prurito sia cessato.
Naturalmente, continuare a grattarsi con foga è dannoso per la pelle perché la danneggia, ma conoscere i meccanismi neuronali che stanno alla base di tali atteggiamenti potrebbe portare, in un prossimo futuro, alla messa a punto di farmaci che agiscano sulla zona cerebrale.

38 COMMENTI

  1. Right here is the right webpage for anybody
    who wishes to find out about this topic. You know a whole lot its almost tough to
    argue with you (not that I really will need to…HaHa).
    You definitely put a fresh spin on a subject that has been discussed for years.
    Excellent stuff, just wonderful!

  2. Hello this is kinda of off topic but I was wanting to know if blogs use WYSIWYG editors or if you have to manually code with HTML.
    I’m starting a blog soon but have no coding knowledge so I wanted to get guidance from someone
    with experience. Any help would be greatly appreciated!

  3. I’m no longer sure the place you’re getting your info,
    however great topic. I needs to spend a while learning much more or working
    out more. Thanks for excellent info I was looking for this info for my mission.

  4. Hello! This post could not be written any better!

    Reading through this post reminds me of my previous room mate!
    He always kept talking about this. I will forward this post to him.
    Pretty sure he will have a good read. Many thanks for sharing!

  5. Please let me know if you’re looking for a article author for
    your blog. You have some really good posts and I think I would be a good asset.
    If you ever want to take some of the load off, I’d absolutely love to
    write some material for your blog in exchange for a link back to mine.
    Please send me an e-mail if interested. Thank you!

  6. Does your blog have a contact page? I’m having trouble locating it but, I’d like
    to shoot you an email. I’ve got some creative ideas for your blog you might be interested in hearing.

    Either way, great blog and I look forward to seeing it grow over
    time.

  7. What i do not understood is actually how you’re now
    not actually a lot more smartly-liked than you might be right now.
    You are very intelligent. You know therefore considerably in the case of this
    topic, made me individually believe it from numerous varied angles.
    Its like women and men aren’t fascinated unless it is one thing to do
    with Woman gaga! Your own stuffs outstanding.
    At all times deal with it up! natalielise plenty of
    fish

  8. Hmm it looks like your site ate my first comment (it was
    extremely long) so I guess I’ll just sum it up what I submitted and say,
    I’m thoroughly enjoying your blog. I as well am an aspiring blog blogger but I’m still new to everything.
    Do you have any points for rookie blog writers? I’d certainly appreciate it.

  9. Howdy! This is my first comment here so I just wanted to give a quick shout out and tell you I genuinely
    enjoy reading through your articles. Can you
    recommend any other blogs/websites/forums that go over the same subjects?
    Thanks a lot!

  10. I’m not sure where you’re getting your information, but great topic.
    I needs to spend some time learning much more
    or understanding more. Thanks for wonderful info I was looking for this information for my mission.

  11. I’m not sure where you are getting your info, but great topic.
    I needs to spend some time learning much more or understanding more.
    Thanks for magnificent info I was looking for this info for my mission.

  12. You really make it appear so easy with your presentation however I
    to find this topic to be really one thing which I think I might by no means
    understand. It kind of feels too complex and very wide for me.
    I’m taking a look ahead to your subsequent publish,
    I will try to get the dangle of it!

  13. Hello There. I discovered your weblog using msn. This is an extremely well written article.
    I’ll make sure to bookmark it and come back to learn more of your helpful info.
    Thank you for the post. I’ll certainly return.

LASCIA UN COMMENTO

Please enter your comment!
Please enter your name here