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Bekasi, Saco-Indonesia.com - Tidak Bedanya seperti tubuh, otak juga membutuhkan nutrisi. Untuk energi, otak perlu glukosa yang mudah dimetabolisme dari karbohidrat. Untuk perlindungan, otak perlu berbagai vitamin dan antioksidan. Sementara itu untuk performanya, otak perlu asam lemak.
Dapatkan berbagai nutrisi yang diperlukan otak dari sumber-sumber terbaik berikut.

Karbohidrat
Pilihlah serelia utuh seperti tepung gandum, oatmeal, dan jewawut yang merupakan karbohidrat sehat yang cepat dicerna untuk menghasilkan glukosa. Cara yang paling banyak digunakan untuk mengkonsumsi padi-padian adalah melalui nasi dan roti, walaupun biskuit dan sereal juga sama bernutrisinya.

Berdasarkan "Advanced Nutrition and Human Metabolism," glukosa adalah bahan bakar utama otak. Sedikitnya 100 gram karbohidrat perlu dimakan setiap hari untuk menyediakan cukup glukosa sebagai kekuatan otak. Gandum utuh juga sumber vitamin B, selenium, dan serat larut. Serat larut bisa mengatur kadar kolesterol dalam darah, yang mengurangi risiko penyakit kardiovaskular dan stroke.

Lemak ikan
Ikan berlemak seperti salmom, makarel, tuna, herring, dan sardin tidak hanya kaya protein. Ikan ini juga sumber vitamin B, kalsium, dan asam lemak. Salah satunya asam lemak omega 3 yang penting untuk fungsi otak dan sistem saraf.

Dalam "Biochemical, Physiological and Molecular Aspects of Human Nutrition," disebutkan asam lemak omega 3 penting untuk pembentukan mielin, lapisan pelindung saraf yang memungkinkan aliran cepat impuls otak. Asam lemak omega 3 juga berperan penting  dalam perilaku dan kecerdasan. Kekurangan omega 3 menyebabkan gangguan seperti depresi dan disleksia.

Buah berry yang kaya antioksidan
Blueberry adalah buah yang kaya antioksidan, yang bekerja untuk melindungi pembuluh darah dan otak dari stres oksidatif yang dihasilkan radikal bebas.

Salah satu antioksidan adalah vitamin E  yang mencegah penurunan kognitif karena faktor usia. Penelitian yang terbit dalam "Nutritional Neuroscience"  edisi 2005 mennyebutkan, rutin makan bluberry akan meningkatkan kapasitas belajar, memori dan kemampuan motorik pada tikus yang semakin tua. Anthocyanin pada blueberry juga meningkatkan pertumbuhan neuron baru pada area amigdala di otak.

Kacang dan biji-bijian
Beberapa kacang dan biji-bijian adalah sumber yang baik untuk protein, mineral, vitamin E, asam lemak omega 6 dan beberapa asam amino penting. Contohnya, labu dan wijen yang kaya tirosin.

Tirosin adalah asam amino yang dibutuhkan untuk pembentukan sintesis dopamine. Dopamine adalah neurotranmitter yang mengatur mood dan mengkoordinasikan gerakan.

Beberapa kacang dan biji-bijian adalah sumber vitamin B yang baik. Misalnya walnuts, almonds, cashews, hazelnuts, flaxseeds dan biji bunga matahari.

Vitamin B-6 diperlukan untuk produksi dopamine dan serotonin yang penting untuk komunikasi antar neuron. Sedangkan kekurangan vitamin B 12 berdampak pada gejala yang sama dengan Alzheimer. Sementara asam folat diperlukan otak untuk memperbaiki memori dan konsentrasi.

Sumber :LiveStrong/kompas.com
Editor :  Maulana Lee
Beberapa Makanan untuk Kesehatan Otak

Though Robin and Joan Rolfs owned two rare talking dolls manufactured by Thomas Edison’s phonograph company in 1890, they did not dare play the wax cylinder records tucked inside each one.

The Rolfses, longtime collectors of Edison phonographs, knew that if they turned the cranks on the dolls’ backs, the steel phonograph needle might damage or destroy the grooves of the hollow, ring-shaped cylinder. And so for years, the dolls sat side by side inside a display cabinet, bearers of a message from the dawn of sound recording that nobody could hear.

In 1890, Edison’s dolls were a flop; production lasted only six weeks. Children found them difficult to operate and more scary than cuddly. The recordings inside, which featured snippets of nursery rhymes, wore out quickly.

Yet sound historians say the cylinders were the first entertainment records ever made, and the young girls hired to recite the rhymes were the world’s first recording artists.

Year after year, the Rolfses asked experts if there might be a safe way to play the recordings. Then a government laboratory developed a method to play fragile records without touching them.

Audio

The technique relies on a microscope to create images of the grooves in exquisite detail. A computer approximates — with great accuracy — the sounds that would have been created by a needle moving through those grooves.

In 2014, the technology was made available for the first time outside the laboratory.

“The fear all along is that we don’t want to damage these records. We don’t want to put a stylus on them,” said Jerry Fabris, the curator of the Thomas Edison Historical Park in West Orange, N.J. “Now we have the technology to play them safely.”

Last month, the Historical Park posted online three never-before-heard Edison doll recordings, including the two from the Rolfses’ collection. “There are probably more out there, and we’re hoping people will now get them digitized,” Mr. Fabris said.

The technology, which is known as Irene (Image, Reconstruct, Erase Noise, Etc.), was developed by the particle physicist Carl Haber and the engineer Earl Cornell at Lawrence Berkeley. Irene extracts sound from cylinder and disk records. It can also reconstruct audio from recordings so badly damaged they were deemed unplayable.

“We are now hearing sounds from history that I did not expect to hear in my lifetime,” Mr. Fabris said.

The Rolfses said they were not sure what to expect in August when they carefully packed their two Edison doll cylinders, still attached to their motors, and drove from their home in Hortonville, Wis., to the National Document Conservation Center in Andover, Mass. The center had recently acquired Irene technology.

Audio

Cylinders carry sound in a spiral groove cut by a phonograph recording needle that vibrates up and down, creating a surface made of tiny hills and valleys. In the Irene set-up, a microscope perched above the shaft takes thousands of high-resolution images of small sections of the grooves.

Stitched together, the images provide a topographic map of the cylinder’s surface, charting changes in depth as small as one five-hundredth the thickness of a human hair. Pitch, volume and timbre are all encoded in the hills and valleys and the speed at which the record is played.

At the conservation center, the preservation specialist Mason Vander Lugt attached one of the cylinders to the end of a rotating shaft. Huddled around a computer screen, the Rolfses first saw the wiggly waveform generated by Irene. Then came the digital audio. The words were at first indistinct, but as Mr. Lugt filtered out more of the noise, the rhyme became clearer.

“That was the Eureka moment,” Mr. Rolfs said.

In 1890, a girl in Edison’s laboratory had recited:

There was a little girl,

And she had a little curl

Audio

Right in the middle of her forehead.

When she was good,

She was very, very good.

But when she was bad, she was horrid.

Recently, the conservation center turned up another surprise.

In 2010, the Woody Guthrie Foundation received 18 oversize phonograph disks from an anonymous donor. No one knew if any of the dirt-stained recordings featured Guthrie, but Tiffany Colannino, then the foundation’s archivist, had stored them unplayed until she heard about Irene.

Last fall, the center extracted audio from one of the records, labeled “Jam Session 9” and emailed the digital file to Ms. Colannino.

“I was just sitting in my dining room, and the next thing I know, I’m hearing Woody,” she said. In between solo performances of “Ladies Auxiliary,” “Jesus Christ,” and “Dead or Alive,” Guthrie tells jokes, offers some back story, and makes the audience laugh. “It is quintessential Guthrie,” Ms. Colannino said.

The Rolfses’ dolls are back in the display cabinet in Wisconsin. But with audio stored on several computers, they now have a permanent voice.

Ghostly Voices From Thomas Edison’s Dolls Can Now Be Heard

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