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By Oliver Sacks

Oliver Sacks vuelve a hacer gala de su singular talento como narrador, su sentido del humor y su inmensa cultura para plantear cuestiones que ponen en entredicho nuestra percepción del mundo y, muchas veces, nuestra propia identidad. Desde las visiones religiosas y su explicación fisiológica hasta el uso de drogas psicodélicas como puerta a una percepción inside que los sentidos nos niegan, los relatos del healthcare professional Sacks van más allá del mero historial médico y constituyen una auténtica historia cultural de l. a. percepción, un estudio antropológico de una supuesta anormalidad que no es, en el fondo, más que el reverso de lo que normalmente conocemos como realidad. «Fascinante. l. a. comprensión del physician Sacks hacia sus pacientes y su perspectiva filosófica transforman simples casos clínicos en relatos que iluminan las complejidades del cerebro humano y los misterios de los angeles mente humana» (Michiko Kakutani, ny Times).

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For instance, a child who is abused physically or sexually may constantly be in a state of fear. This could cause some memory problems if the hippocampus has been physically damaged. Such a condition may also cause damage to neurons (Khalsa, 1997). Your students walk into your room, busily talking to each other about the carnival this evening. The girls are discussing what they are going to wear; the boys are bragging about how much money they have to spend on the games. Getting them to settle down is difficult.

He is no longer a top student. Johnny is also under stress. He feels threatened by the new environment and by his fellow students. His cortisol levels are rising as he perceives himself in a “fight or flight” situation. Because of the increased amount of cortisol, Johnny may not be thinking straight. If the cortisol is interrupting transmission between neurons, he probably feels even more threatened. The lower serotonin level may be affecting his norepinephrine level, causing him to be more aggressive.

This structure does not house all of your memories. It simply catalogs them and sends them for permanent placement in other longterm memory storage units (see Sylwester, 1997a). Without a hippocampus you cannot form new long-term factual memories. The hippocampus is comparable to a receptionist in a busy office. When you call the office and ask to speak to someone, the receptionist pushes buttons that connect you. If the receptionist is unavailable, you can dial the number and listen endlessly to the ringing.

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