Penelitian gambar tentang tidur resolusi tinggi menunjukkan bagaimana otak mengulang selama tidur-T-REC semarang--komunitas reptil-semarang--KSE-komunitas satwa eksotik—komunitas semarang—komunitas reptil—komunitas reptil semarang—komunitas satwa—komunitas satwa semarang--berita artikel terkait tentang tidur,otak,rekam otak

Penelitian gambar tentang tidur resolusi tinggi menunjukkan bagaimana otak mengulang selama tidur

Tanggal:

2 Februari 2017

Sumber:

University of Wisconsin-Madison

Ringkasan:

gambar mencolok dari mikroskop elektron dari dalam otak tikus menunjukkan apa yang terjadi di otak kita sendiri setiap hari: sinapsis kita- persimpangan antara sel-sel saraf - tumbuh kuat dan besar selama stimulasi di siang hari, kemudian menyusut hampir 20 persen sementara kita tidur , menciptakan ruang untuk pertumbuhan yang lebih dan belajar pada hari berikutnya.

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Proyek penelitian empat tahun yang diterbitkan di Science menawarkan bukti visual langsung dari "sinaptik homeostasis hipotesis" (SHY) yang diusulkan oleh Drs. Chiara Cirelli dan Giulio Tononi dari the Wisconsin Center for Sleep and Consciousness

Hipotesis ini menyatakan bahwa tidur adalah harga yang kita bayar untuk otak yang plastik dan dapat terus belajar hal-hal baru.

Ketika sinaps berulang kali diaktifkan selama terjaga, tumbuh dalam kekuatan, dan pertumbuhan ini diyakini penting untuk belajar dan memori. Menurut SHY, namun, pertumbuhan ini perlu diimbangi untuk menghindari kejenuhan sinapsis dan pemusnahan sinyal saraf dan kenangan. Tidur diyakini menjadi waktu terbaik untuk proses renormalization, karena ketika tidur kita membayar banyak sedikitnya memperhatikan dunia luar dan bebas dari "di sini dan sekarang."

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Sleep research high-resolution images show how the brain resets during sleep,Penelitian gambar tentang tidur resolusi tinggi menunjukkan bagaimana otak memgulang selama tidur

,synaptic homeostasis hypothesis,SHY,3-D,cerebral cortex

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Sleep research high-resolution images show how the brain resets during sleep

Date:

February 2, 2017

Source:

University of Wisconsin-Madison

Summary:

Striking electron microscope pictures from inside the brains of mice suggest what happens in our own brain every day: Our synapses -- the junctions between nerve cells -- grow strong and large during the stimulation of daytime, then shrink by nearly 20 percent while we sleep, creating room for more growth and learning the next day.

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The four-year research project published today in Science offers a direct visual proof of the "synaptic homeostasis hypothesis" (SHY) proposed by Drs. Chiara Cirelli and Giulio Tononi of the Wisconsin Center for Sleep and Consciousness.

This hypothesis holds that sleep is the price we pay for brains that are plastic and able to keep learning new things.

When a synapse is repeatedly activated during waking, it grows in strength, and this growth is believed to be important for learning and memory. According to SHY, however, this growth needs to be balanced to avoid the saturation of synapses and the obliteration of neural signaling and memories. Sleep is believed to be the best time for this process of renormalization, since when asleep we pay much less attention to the external world and are free from the "here and now."

When synapses get stronger and more effective they also become bigger, and conversely they shrink when they weaken. Thus, Cirelli and Tononi reasoned that a direct test of SHY was to determine whether the size of synapses changes between sleep and wake. To do so, they used a method with extremely high spatial resolution called serial scanning 3-D electron microscopy.

The research itself was a massive undertaking, with many research specialists working for four years to photograph, reconstruct, and analyze two areas of cerebral cortex in the mouse brain. They were able to reconstruct 6,920 synapses and measure their size.

The team deliberately did not know whether they were analyzing the brain cells of a well-rested mouse or one that had been awake. When they finally "broke the code" and correlated the measurements with the amount of sleep the mice had during the six to eight hours before the image was taken, they found that a few hours of sleep led on average to an 18 percent decrease in the size of the synapses. These changes occurred in both areas of the cerebral cortex and were proportional to the size of the synapses.

The scaling occurred in about 80 percent of the synapses but spared the largest ones, which may be associated with the most stable memory traces.

"This shows, in unequivocal ultrastructural terms, that the balance of synaptic size and strength is upset by wake and restored by sleep," Cirelli says. "It is remarkable that the vast majority of synapses in the cortex undergo such a large change in size over just a few hours of wake and sleep.

Tononi adds, "Extrapolating from mice to humans, our findings mean that every night trillions of synapses in our cortex could get slimmer by nearly 20 percent."

The study was published today in Science along with research from Dr. Richard Huganir's laboratory at Johns Hopkins University in Baltimore. This study, using biochemical and molecular methods, confirms SHY's prediction that synapses undergo a process of scaling down during sleep, and identifies genes important for this process.

Story Source:

Materials provided by University of Wisconsin-Madison. Note: Content may be edited for style and length.

Journal Reference:

1. Luisa De Vivo, Michele Bellesi, William Marshall, Eric A. Bushong, Mark H. Ellisman, Giulio Tononi, Chiara Cirelli.Ultrastructural evidence for synaptic scaling across the wake/sleep cycle. Science, 2017 DOI:10.1126/science.aah5982

https://www.sciencedaily.com/releases/2017/02/170202141913.htm

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