Home > Comunicazione, Emozioni, FAQ, Ricerche > FAQ sugli emisferi cerebrali: qual è il loro ruolo?

FAQ sugli emisferi cerebrali: qual è il loro ruolo?

La figura è complicata, lo so, ma l’ho messa perché mi piaceva. Spiegherò a parole ciò che l’immagine fatica a dire :-)

Quanti miti e leggende circolano sulla lateralizzazione emisferica? Tante, tantissime, alcune sembrano vere e proprie favole, ed altre lo sono davvero.
Facciamo un po’ di chiarezza, quindi.
Si dice che varie parti del cervello svolgano funzioni diverse, e questo è vero, per certi versi. In più, è idea diffusa quella che vuole che i due emisferi del cervello, quello destro e quello sinistro, svolgano funzioni differenti, e che uno dei due sia predominante. L’idea che ci sia una dominanza da parte di un emisfero sull’altro deriva dalle scoperte di un famoso neurologo che si chiamava Paul Broca, il quale, durante i suoi studi notò che un suo paziente con una lesione cerebrale sinistra, aveva perso l’uso del linguaggio. Da quì cominciò a prendere piede l’idea che l’emisfero sinistro fosse di gran lunga superiore a quello destro.

La realtà dei fatti, però, non è propriamente questa. I due emisferi cerebrali sono molto diversi tra loro, e più che una dominanza dell’uno sull’altro, possiamo dire che esiste una maggiore competenza dell’uno rispetto all’altro, a seconda della funzione che consideriamo. Infatti, se si verifica una lesione nello stesso punto sia dell’emisfero destro che di quello sinistro, gli effetti saranno differenti. Se, per esempio, c’è una lesione nell’emisfero sinistro, è probabile che avremo un disturbo del linguaggio [come scoprì Paul Broca], mentre se c’è una lesione nello stesso punto, ma dell’emisfero destro, è probabile avere tutt’altro tipo di disturbo.

Ma cosa fanno i due emisferi, precisamente? Quali sono i loro compiti, di cosa si occupano?
Come abbiamo già detto, il linguaggio è una funzione di cui si occupa, solitamente, l’emisfero sinistro. Dico “solitamente” perché può succedere anche il contrario: tra i mancini, per esempio, ovvero coloro che usano la mano sinistra come mano preferita, ce ne sono anche alcuni che hanno le funzioni del linguaggio situate in entrambi gli emisferi, o addirittura in quello destro.

Passiamo al chiarimento di una cosa importantissima, forse la più importante di tutte: il misterioso sistema crociato.
E’ vero che ciascun emisfero controlla la parte opposta del corpo?
Si. Detto in parole semplici, se vediamo un oggetto, o leggiamo una parola nella parte destra del nostro campo visivo -cioè a destra del nostro naso- questa verrà elaborata dall’emisfero sinistro del cervello.E, viceversa, se lo vediamo nella parte sinistra, questo verrà elaborato dall’emisfero destro. Anche se, comunque, ciascun occhio proietta l’immagine ad entrambi gli emisferi cerebrali.

Chiariamo anche quelle leggende che girano sul fatto che l’emisfero sinistro sia quello “razionale” e l’emisfero destro quello “creativo”. L’idea di base in un certo senso è corretta, ma non del tutto, ovviamente. Vediamo perché:
Alcuni esperimenti hanno mostrato che quando una parola veniva presentata a destra, la persona impiegava meno tempo a riconoscerla e discriminarla, perché questa veniva elaborata dall’emisfero sinistro. Quindi, la conseguenza di questo, è naturalmente che l’emisfero sinistro sia maggiormente preposto all’elaborazione del linguaggio.
E l’emisfero destro, cosa fa? L’emisfero destro, invece, dà prestazioni migliori quando si tratta di elaborazioni visuo-spaziali, come per esempio la descrizione di volti umani, o delle forme in genere.
Quindi l’emisfero sinistro viene detto “razionale” semplicemente perché è “più bravo” e più veloce a riconoscere parole, lettere e numeri. Mentre l’emisfero destro viene detto “creativo” perché è più bravo e più veloce nel riconoscere ed elaborare le forme e lo spazio.

E perché si dice che l’emisfero sinistro sia quello “logico” e l’emisfero destro sia quello “emotivo”?
Luoghi comuni sostengono che l’emisfero sinistro sia la parte del cervello razionale, più scientifica, più logica, mentre quello sinistro sia la parte umanistica, più emotiva, più deputata alle sensazioni. E’ vero? No.
O comunque non bisogna assolutizzare. Come ogni cosa, anche questa ha una base di verità, ma che è stata estremamente distorta e riportata alla realtà in modo quasi del tutto nuovo. I due emisferi sono differenti anche per quanto riguarda le emozioni, certo, però il discorso è un po’ più fine: l’emisfero destro è quello che meglio si attiva quando quando c’è un eccitamento emotivo, ma anche l’emisfero sinistro ha a che fare con le emozioni. La differenza non è emozione si/emozione no, ma nel tipo di emozioni con cui hanno a che fare i diversi emisferi:
l’emisfero destro è più specializzato nell’attivazione delle emozioni negative, come la paura; mentre l’emisfero sinistro è più specializzato nelle emozioni positive.

E l’udito? Qual è l’orecchio predominante, tra i due?
Per l’udito, quando si tratta di parole ,lettere, numeri e cose che hanno a che fare con i linguaggio, l’orecchio destro -e quindi l’emisfero sinistro- percepisce più velocemente e più accuratamente. Mentre se si tratta di elementi non verbali, come versi e suoni -il suono del mare, per esempio- l’orecchio sinistro riesce meglio di quello destro.

Riferimenti ed approfondimenti: [x] [x]
David B. Boles. Department of Psychology, University of Illinois, Champaign, IL 61820, U.S.A.
“Global versus local processing: is there a hemispheric dicotomy?”

About these ads
  1. settembre 20, 2012 alle 1:43 pm

    Do you think you’re receiving a lot of visitors to your blog? I’ve truly have been
    searching for tips to get visitors to my website, without much good luck.
    Any information will be really appreciated.

  2. gennaio 6, 2013 alle 12:27 am

    I amongst other reviewers are genuinely happy with the product.
    The course is to regularly raise your workload with each workout so your
    muscle has endurance, resistance and new development is maintained.
    In common the big comparison the truth about abs review comes to with other items is basically; a
    lot of diet programs involve the use of supplements which are typically performing much more harm than very good, you are not essential to stave
    your self to drop weight – it uses foods that are medically confirmed to promote weight
    loss; it will not tell you that you will get outcomes overnight, it promotes a hard perform ethic.
    All the workout routines would be to significantly to match in this review on the
    truth about abs plan.The truth about abs program lets you do
    all the workouts in the privacy of your property.Not only
    will you drop weight, you will get a toned up six pack; that will make you feel great and look excellent.
    Without following the nutritional side of the strategy –
    the exercises will not have the intended effect.It also well documented throughout your six pack will not occur overnight and touches on
    attaining a strong mind plan and considering.Thank you for reading
    my review on the truth about abs program.A
    fantastic selection and range of difficulty is included; from
    a newbie level proper by way of to challenging and advanced.

  3. marzo 20, 2013 alle 6:16 pm

    It’s very trouble-free to find out any matter on net as compared to books, as I found this paragraph at this web page.

  4. marzo 26, 2013 alle 10:11 pm

    Hey There. I found your weblog the use of msn.
    This is an extremely smartly written article. I will be sure to
    bookmark it and return to read more of your useful info.
    Thanks for the post. I will certainly comeback.

  5. aprile 7, 2013 alle 12:10 pm

    That is really attention-grabbing, You are a very skilled blogger.

    I’ve joined your feed and look ahead to seeking extra of your magnificent post. Additionally, I’ve shared your site in my social networks

  6. aprile 8, 2013 alle 8:32 pm

    If some one wishes expert view on the topic of blogging and site-building afterward
    i recommend him/her to go to see this webpage,
    Keep up the pleasant job.

  7. aprile 10, 2013 alle 6:16 am

    It can hurt at first though, so prepare your face
    by running an ice cube over the brow line or other part of the face that will be plucked free of unwanted hair.
    Since the holiday season is approaching, you can rest assured that you might acquire massive reductions on selected designs.
    It can also be utilized in the shower as nicely and fully eradicates scattering hair all over the bathroom.

  8. aprile 15, 2013 alle 9:34 pm

    What’s up, after reading this remarkable article i am also happy to share my knowledge here with mates.

  9. aprile 16, 2013 alle 6:13 am

    Thanks for any other excellent post. Where else may just anybody get that type of information in such an ideal method of writing?
    I’ve a presentation next week, and I’m on the look for such
    info.

  10. aprile 17, 2013 alle 10:06 am

    Fantastic items from you, man. I have take into account your stuff previous to and you’re just extremely fantastic. I really like what you have received here, certainly like what you’re saying and
    the way in which through which you assert it. You are making it entertaining and you still take care of to keep it wise.
    I can’t wait to read far more from you. That is actually a wonderful site.

  11. aprile 18, 2013 alle 1:34 pm

    I know this if off topic but I’m looking into starting my own blog and was wondering what all is needed to get set up? I’m assuming
    having a blog like yours would cost a pretty penny?
    I’m not very web savvy so I’m not 100% certain. Any recommendations or advice would be greatly appreciated. Appreciate it

  12. aprile 20, 2013 alle 8:44 am

    Hmm is anyone else experiencing problems with the pictures on this blog loading?
    I’m trying to figure out if its a problem on my end or if it’s the blog.
    Any responses would be greatly appreciated.

  13. aprile 26, 2013 alle 10:41 pm

    You will have the benefit of better blood flow due
    to turmeric’s ability to prevent clot formation in the blood. Turmeric comes from the ginger family and is found in South Asia, particularly in India. Turmeric is one of the greatest of all natural sources for antioxidants while at the same time being one of the strongest natural pain killers.

  14. aprile 27, 2013 alle 11:11 pm

    Nevertheless, the preservation of food is still a daily affair and therefore,
    I have listed a few top tips on preserving foodstuff underneath, so that you will get the best
    from that which you have bought or grown in your very own garden even if
    it is a long while later. This will ensure that the moisture in them will not
    increase quite as rapidly. Cook crepe, turning over until lightly browned on both
    sides.

  15. maggio 6, 2013 alle 6:36 am

    I’m excited to find this page. I want to to thank you for your time just for this fantastic read!! I definitely appreciated every bit of it and i also have you saved to fav to check out new things on your blog.

  16. maggio 16, 2013 alle 3:07 pm

    Woah! I’m really digging the template/theme of this site. It’s simple,
    yet effective. A lot of times it’s challenging to get that “perfect balance” between usability and appearance. I must say you have done a amazing job with this. In addition, the blog loads super quick for me on Safari. Outstanding Blog!

  17. maggio 17, 2013 alle 9:06 pm

    LDL is said to be harmful and HDL is described as being healthful.
    It also helps detoxify our body effectively and balances our
    digestive tract. If you are buying directly from a farmer, find out if the cows
    are kept mostly on pasture and that the barn is kept clean.

  18. luglio 1, 2013 alle 10:16 am

    Do you have a spam problem on this site; I also am a blogger, and I was wanting to know your situation; many of us have created some nice methods and we are looking to trade strategies with other folks, be sure to shoot me an
    e-mail if interested.

  19. luglio 2, 2013 alle 4:17 am

    When someone writes an paragraph he/she keeps
    the image of a user in his/her brain that how a user can understand it.
    Thus that’s why this article is perfect. Thanks!

  20. luglio 2, 2013 alle 9:51 pm

    Hi there, I wish for to subscribe for this
    webpage to take most recent updates, thus where can i do
    it please help.

  21. luglio 4, 2013 alle 5:28 pm

    I’m curious to find out what blog platform you have been using? I’m
    having some small security issues with my latest blog and I would like to find something more safe.
    Do you have any suggestions?

  22. luglio 15, 2013 alle 2:18 am

    It’s perfect time to make some plans for the longer term and it is time to be happy. I’ve read this submit and if I could I want to counsel you some
    interesting issues or advice. Maybe you can write subsequent articles
    regarding this article. I wish to learn even more things approximately it!

  23. luglio 15, 2013 alle 10:43 am

    The help and advice above is surprisingly informative. I have discovered several ideas.

  24. luglio 23, 2013 alle 3:12 pm

    Thank you for making the honest attempt to write about
    this. It may be extremely useful for me as well as my friends.

  25. luglio 23, 2013 alle 11:38 pm

    What’s Going down i am new to this, I stumbled upon this I have found It positively useful and it has aided me out loads. I am hoping to give a contribution & aid other users like its helped me. Great job.

  26. agosto 8, 2013 alle 7:13 am

    Right now it looks like WordPress is the top blogging platform out there right now.
    (from what I’ve read) Is that what you are using on your blog?

  27. settembre 28, 2013 alle 3:51 pm

    I’ve been browsing online more than three hours nowadays, yet I by no means discovered any fascinating article like yours.
    It’s pretty worth enough for me. In my opinion, if all website owners and bloggers made just right
    content as you probably did, the internet might
    be a lot more helpful than ever before.

  28. settembre 28, 2013 alle 8:18 pm

    Hi, after reading this remarkable article i am
    as well cheerful to share my knowledge here with friends.

  29. settembre 29, 2013 alle 2:24 pm

    I’d like to thank you for the efforts you’ve put
    in penning this blog. I really hope to see the same
    high-grade blog posts by you in the future as well. In truth, your creative writing abilities
    has inspired me to get my own, personal blog now ;)

  30. ottobre 4, 2013 alle 1:18 am

    It’s an remarkable paragraph in favor of all the online visitors; they will
    obtain benefit from it I am sure.

  31. gennaio 5, 2014 alle 9:47 pm

    If you are going for most excellent contents like myself, only visit
    this web site daily since it presents feature contents, thanks

  32. marzo 23, 2014 alle 4:59 am

    This is really interesting, you’re a very professional blogger.
    I’ve joined your rss feed as well as sit up for trying
    to find more of your excellent post.In addition,
    I have shared your site in my social networks!

  33. maggio 7, 2014 alle 8:58 pm

    Your style is very unique in comparison to other folks I’ve
    read stuff from. Thank you for posting when you have the opportunity, Guess I’ll
    just bookmark this web site.

  34. maggio 7, 2014 alle 10:12 pm

    You really make it appear really easy with your presentation however I in finding this topic to be
    really something which I think I might never understand.
    It kind of feels too complex and very wide for me. I’m taking a look
    ahead on your next post, I will attempt to get the hold of it!

  35. giugno 4, 2014 alle 1:30 pm

    Well, I fully believe what you are saying.
    However your post is just way too short to get all the facts over.
    Will there be an approaching part Two or even part 3 of the article ?

  36. giugno 20, 2014 alle 10:48 am

    What’s up, this weekend is fastidious in favor of me,
    for the reason that this moment i am reading this great informative post here at my residence.

  37. giugno 21, 2014 alle 8:37 am

    Spot on with this write-up, I honestly believe that
    this amazing site needs much more attention. I’ll probably be returning to see more,
    thanks for the info!

  38. giugno 25, 2014 alle 8:09 am

    Wonderful beat ! I wish to apprentice while you amend your site,
    how could i subscribe for a blog website? The account aided me a acceptable deal.
    I had been tiny bit acquainted of this your broadcast provided
    bright clear concept

  39. luglio 4, 2014 alle 11:27 am

    I am really enjoying the theme/design of your weblog.
    Do you ever run into any web browser compatibility issues?
    A couple of my blog audience have complained about my blog not operating correctly in Explorer
    but looks great in Opera. Do you have any advice to
    help fix this problem?

  40. luglio 7, 2014 alle 8:50 pm

    I’m impressed, I must say. Seldom do I come across a blog that’s both educative and interesting, and without a doubt, you’ve hit the nail on the head.
    The problem is something that too few folks are
    speaking intelligently about. I am very happy that I stumbled across this in my search for something relating to this.

  41. seo
    luglio 11, 2014 alle 3:30 am

    Hello there I am so glad I found your webpage, I really found you by mistake, while I was researching on Yahoo for something
    else, Nonetheless I am here now and would just like to say cheers for a incredible post and a all round thrilling blog (I also love the theme/design), I don’t have time to look over it all at the moment but I have book-marked it and also added in your RSS
    feeds, so when I have time I will be back to read a lot more,
    Please do keep up the fantastic work.

  42. luglio 14, 2014 alle 5:53 pm

    I’ll immediately grab your rss feed as I can not find your email subscription link or e-newsletter service.

    Do you’ve any? Please allow me realize in order that I may just subscribe.
    Thanks.

  43. luglio 20, 2014 alle 2:52 pm

    I do believe all the concepts you’ve offered to your post.
    They’re really convincing and will definitely work.
    Still, the posts are too quick for beginners. May just you please extend them a
    little from subsequent time? Thanks for the post.

  44. luglio 23, 2014 alle 12:40 pm

    Hey there just wanted to give you a quick heads up and let you know a few of
    the pictures aren’t loading correctly. I’m not sure why but I think its
    a linking issue. I’ve tried it in two different web browsers and
    both show the same outcome.

  45. luglio 29, 2014 alle 5:37 pm

    I’ve been surfing online more than 4 hours today, yet I never found any interesting article like yours.
    It is pretty worth enough for me. In my view, if all web owners
    and bloggers made good content as you did, the web will be a lot more useful than ever before.

  46. luglio 30, 2014 alle 11:25 pm

    Hi! I know this is kinda off topic but I was wondering which
    blog platform are you using for this site?
    I’m getting tired of WordPress because I’ve had issues with hackers and I’m looking at alternatives for another platform.
    I would be awesome if you could point me in the direction of a good
    platform.

  47. agosto 5, 2014 alle 3:53 am

    Very great post. I simply stumbled upon your blog and wanted to
    say that I have truly enjoyed browsing your weblog posts.

    After all I’ll be subscribing on your feed and I hope
    you write once more soon!

  48. agosto 6, 2014 alle 5:33 am

    Very nice post. I just stumbled upon your blog and wished to
    say that I have truly enjoyed browsing your blog posts.

    In any case I will be subscribing to your rss feed
    and I hope you write again very soon!

  49. agosto 6, 2014 alle 1:19 pm

    Spot on with this write-up, I truly believe that this
    website needs a great deal more attention. I’ll probably be returning
    to read through more, thanks for the advice!

  50. agosto 7, 2014 alle 7:35 pm

    I’ve been surfing on-line more than 3 hours lately, but I by no means found any fascinating article like yours.
    It’s lovely value enough for me. Personally, if all site owners
    and bloggers made good content material as you probably did, the net shall be much more useful
    than ever before.

  51. agosto 8, 2014 alle 7:22 am

    Pretty section of content. I simply stumbled upon your weblog and in accession capital
    to say that I get actually loved account your blog posts.
    Anyway I’ll be subscribing in your feeds or even I fulfillment you access constantly rapidly.

  52. agosto 18, 2014 alle 6:12 am

    I do not even know how I finished up here, however I assumed this submit was once good.

    I do not recognize who you’re but definitely you’re going to a
    well-known blogger in the event you aren’t already. Cheers!

  1. maggio 3, 2014 alle 1:51 pm

Rispondi

Inserisci i tuoi dati qui sotto o clicca su un'icona per effettuare l'accesso:

Logo WordPress.com

Stai commentando usando il tuo account WordPress.com. Chiudi sessione / Modifica )

Foto Twitter

Stai commentando usando il tuo account Twitter. Chiudi sessione / Modifica )

Foto di Facebook

Stai commentando usando il tuo account Facebook. Chiudi sessione / Modifica )

Google+ photo

Stai commentando usando il tuo account Google+. Chiudi sessione / Modifica )

Connessione a %s...

Iscriviti

Ricevi al tuo indirizzo email tutti i nuovi post del sito.

%d blogger cliccano Mi Piace per questo: