Los abrazos activan la química cerebral del bienestar, la calma y la alegría, a corto y largo plazo

Los niños “tocan base” cuando están corriendo alegremente y, de repente, se sientan en el regazo de mamá o de papá, se apoyan en ellos o buscan algún tipo de contacto. Esta actitud puede durar segundos, o apenas unos minutos. Enseguida vuelven a sus juegos. Esto se llama “reabastecimiento emocional” y sirve para crear un precioso equilibrio químico en sus cerebros. Si tu hija o hijo se comporta así contigo, te hace un gran cumplido: te considera una fuente natural de opioides cerebrales.

Tanto nuestro cuerpo como nuestro cerebro secretan hormonas, poderosas sustancias químicas que nos pueden hacer sentir muy bien o muy mal. Normalmente, pensamos en las hormonas solo en relación con nuestra sexualidad, pero existen muchos tipos que nos afectan de muchas maneras en nuestros sentimientos, percepciones y comportamientos.
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The Fearful Mind

Fear is a hardwired response, but it doesn’t have to rule our emotions.

Nearly one fifth of the U.S. adult population suffers from an anxiety disorder, according to 2018 data. At their core, the worry and panic that make up general anxiety stem from an overactive fear response in the brain. And indeed, that primordial reaction is one of the most examined topics in neuroscience— investigated in rodents, humans, other apes and even invertebrates.

But how much do those automatic feelings relate to the emotions that humans associate with fear and, subsequently, their experience in the world? To sort out the issue, as six neuroscientists discuss in a fascinating Q&A in these pages, step one is for the field to come to agreement over an exact definition of fear and how best to study it (see “Embracing Our Fear”).

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Os suplementos de magnésio podem ser uma alternativa aos antidepressivos

Um recente ensaio clínico realizado nos Estados Unidos descobriu que os suplementos de magnésio são eficazes no tratamento da depressão leve ou moderada. Publicado no jornal PLoS One, os pesquisadores mostraram que

a suplementação diária com magnésio leva a uma diminuição significativa nos sintomas de depressão e ansiedade, independentemente da idade, do gênero, da gravidade da depressão ou do uso de drogas antidepressivas do paciente. Observando que o mineral funciona rapidamente e é bem tolerado, o estudo concluiu que pode ser uma alternativa segura à medicação farmacêutica.

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Human Skulls Follow da Vinci’s Golden Ratio

The Golden Ratio, described by Leonardo da Vinci and Luca Pacioli as the Divine Proportion, is an infinite number often found in nature, art and mathematics. It’s a pattern in pinecones, seashells, galaxies and hurricanes.

In a new study investigating whether skull shape follows the Golden Ratio (1.618 … ), Johns Hopkins researchers compared 100 human skulls to 70 skulls from six other animals, and found that the human skull dimensions followed the Golden Ratio. The skulls of less related species such as dogs, two kinds of monkeys, rabbits, lions and tigers, however, diverged from this ratio.

“The other mammals we surveyed actually have unique ratios that approach the Golden Ratio with increased species sophistication,” says Rafael Tamargo, M.D., professor of neurosurgery at the Johns Hopkins University School of Medicine. “We believe that this finding may have important anthropological and evolutionary implications.”

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Dancing can reverse the signs of aging in the brain

 

 

 

 

 

 

As we grow older we suffer a decline in mental and physical fitness, which can be made worse by conditions like Alzheimer’s disease. A new study, published in the open-access journal Frontiers in Human Neuroscience, shows that older people who routinely partake in physical exercise can reverse the signs of aging in the brain, and dancing has the most profound effect.

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