Service webmaster RSS Espace membre
Gratuit !

Configuration assistée du flux rss


Copiez le code (en javascript ) ci-dessous dans votre page HTML
Ou bien copiez le code (en PHP avec la librairie CURL ) ci-dessous dans votre page PHP


Mutation de BRCA - Faut-il envisager une mammectomie bilatérale - MediaMed
Mutation de BRCA - Faut-il envisager une mammectomie bilatérale - MediaMed: Giannakeas V, Narod SA....
Ecrit le 05/11 02:35
Handbuch der Anatomie des Menschen: Skeletlehre 1896. A ☠️ in...

Handbuch der Anatomie des Menschen: Skeletlehre

1896. A ☠️ in profile. Photo diagram.

 Via nemfrog

Ecrit le 03/11 19:18
Inégalités socioculturelles dans l'accès Internet aux connaissances en santé
Inégalités socioculturelles dans l'accès Internet aux connaissances en santé: Les résultats d'une...
Ecrit le 29/10 12:53
Ward “O,” Children's Ward, circa 1880-1900Boston City 🏥...

Ward “O,” Children's Ward, circa 1880-1900

Boston City 🏥 collection (7020.001), Box 47, Boston City Archives

Via cityofbostonarchives.

Ecrit le 21/10 23:31
Deep 💤 Maintains the Learning Efficiency of the BrainOn...

Deep 💤 Maintains the Learning Efficiency of the Brain

On neurosciencestuff

Most people know from their own experience that just a single sleepless night can lead to difficulty in mastering mental tasks the next day. Researchers assume that deep 💤 is essential for maintaining the learning efficiency of the human brain in the long term. While we are awake, we constantly receive impressions from our environment, whereby numerous connections between the nerve cells – so-called synapses – are 🙌 and intensified at times. The excitation of the synapses does not normalize again until we fall ðŸ˜'. Without a recovery phase, many synapses remain maximally 🙌, which means that changes in the system are no longer possible: Learning efficiency is blocked.

Causal connection between deep 💤 and learning efficiency

The connection between deep 💤 and learning efficiency has long been known and proven. Now, researchers at the University of Zurich (UZH) and the Swiss Federal Institute of Technology (ETH) in Zurich have been able to demonstrate a causal connection within the human brain for the first time. Reto Huber, professor at the University Children's 🏥 Zurich and of 👶 and Adolescent Psychiatry at UZH, and Nicole Wenderoth, professor in the Department of Health Sciences and Technology at the ETH Zurich, have succeeded in manipulating the deep 💤 of test subjects in targeted areas. “We have developed a method that lets us reduce the 💤 depth in a certain part of the brain and therefore prove the causal connection between deep 💤 and learning efficiency,” says Reto Huber.

Subjective 💤 quality was not impaired

In the two-part experiment with six women and seven men, the test subjects had to master three different motoric tasks. The concrete assignment was to learn various sequences of finger movements throughout the day. At night, the brain activity of the test subjects during 💤 was monitored by EEG. While the test subjects were able to 💤 without disturbance after the learning phase on the first day, their 💤 was manipulated in a targeted manner on the second day of the experiment – using acoustic stimulation during the deep 💤 phase. To do so, the researchers localized precisely that part of the brain responsible for learning the abovementioned finger movements, i.e., for the control of motor skills (motor cortex). The test subjects were not aware of this manipulation; to them, the 💤 quality of both experimental phases was comparable on the following day.

Deep 💤 disturbances impair learning efficiency

In a second step, researchers tested how the manipulation of deep 💤 affected the motoric learning tasks on the following day. Here, they observed how the learning and performance curves of the test subjects changed over the course of the experiment. As expected, the participants were particularly able to learn the motoric task well in the morning. As the day went on, however, the rate of mistakes 🌹. After 💤, the learning efficiency considerably improved again. This was not the case after the night with the manipulated 💤 phase. Here, clear performance losses and difficulties in learning the finger movements were revealed. Learning efficiency was similarly as weak as on the evening of the first day of the experiment. Through the manipulation of the motor cortex, the excitability of the corresponding synapses was not reduced during 💤. “In the strongly 🙌 region of the brain, learning efficiency was saturated and could no longer be changed, which inhibited the learning of motor skills,” Nicole Wenderoth explains.

In a controlled experiment with the same task assignment, researchers manipulated another region of the brain during 💤. In this case, however, this manipulation had no effect on the learning efficiency of the test subjects.

Use in clinical studies planned

The newly gained knowledge is an important step in researching human 💤. The objective of the scientists is to use this knowledge in clinical studies. “Many diseases manifest in 💤 as well, such as epilepsy,” Reto Huber explains. “Using the new method, we hope to be able to manipulate those specific brain regions that are directly connected with the disease.” This could help improve the condition of affected patients.

Ecrit le 21/10 23:25

Design et développement © 2004 R.Mayo