Apparentemente contraddittoria, questa affermazione nasce da una riflessione fatta in seguito alla lettura di un articolo pubblicati nel mese corrente su Repubblica(1). In particolare, lo stimolo a scrivere quanto segue è derivato dall'aver appreso di un ennesimo tentativo, svolto da un team di neuroscienziati dell'università di San Juan nel Puerto Rico, to remove from the mind the trauma of the past. This was demonstrated on the test animals (mice), conditioned to be afraid of a sound stimulus, after which their was a painful electric shock caused by administration of a drug: BDNF (brain-derived neurotrophic factor), which plays an important role in strengthening the connections between neurons, that is to consolidate memory. The action of this protein, capable of making malleable cells, prevents the memories of events too terrible to grow, preventing recurrence in an obsessive way and prevent a peaceful life to the victim and allow to undo the effects of a scare on brain, making the animals even bolder after a painful experience. "Normally, to delete from the head of a fear of mice, the sound is repeated many times without being associated with any shock. "We have discovered with surprise - says Gregory Quirk Science psychiatrist who conducted the experiment - there's no need for a new packaging to return the mouse to the quiet. Simply administering factor BDNF in the cortex prefrontal. This area in the front part of the brain is considered the seat of rational thought and balance its activities with those of the amygdala, which regulates the instinctive fear level. An experiment in addition to that di oggi, condotto a gennaio alla Emory University, aveva dimostrato che bloccando nei topolini il gene che regola la produzione di Bdnf nell'amigdala, i ricordi paurosi non riuscivano a consolidarsi. E i roditori continuavano a muoversi spavaldi nonostante suoni e scosse elettriche. Un altro filone delle ricerche anti-paura punta invece a bloccare il consolidamento del ricordo subito dopo il trauma, somministrando un farmaco che blocca temporaneamente le nuove connessioni fra i neuroni. Ma anche se questi esperimenti sono utili alla comprensione dei meccanismi della mente, le applicazioni pratiche per l'uomo sono lontane. Questo filone delle neuroscienze subisce sempre delle accelerazioni nei periodi di guerra. I ricercatori portoricani hanno ricevuto parte dei loro finanziamenti United States, and a previous study had shown that an American soldier on eight back from the front with anxiety disorders or post-traumatic stress disorder. These are problems caused by the violence experienced in battle reappeared even after the return to normal life (2) ". Although the need to manage such traumatic events is born with a positive motivation, such as the social reintegration of soldiers on leave, who have experienced a post-traumatic stress disorder to return from the militant front, you can see in this mode also a great danger for humans and for any creature on several fronts. 
From a materialistic point of view, we could say that Nature has provided us with a system of internal security, a mechanism for fast response and immediate action to preserve the species in danger. If this system is instinctual not present, the risk of accidents and consequently mortality would certainly be higher than normally experienced for all species. With regard to the human species, there would be further implications of such removal (3): a historical and sociological perspective in which learning evolutionary sense if humanity could be deleted some errors / horrors such as Auschwitz-Birkenau historians, the massacre of Hiroshima The ecological disaster at Chernobyl and, alas, many, many others. Who does not know its history is unable to move forward and clear the memory means to delete the learning opportunities that may arise from certain experiences. Even from an individual point of view: What's the risk if children could be educated to be afraid of the danger through an experience like the one that protected his mother by doing, for example, touching the child more than just warm the oven to teach him not to touch it gets very hot when turned on? To learn from the mistakes you need to remember how you have made and to overcome trauma, even if the responsibility of that is not ours, it is necessary to develop the best, do not remove it. (1) Elena Dusi Verso la pillola del coraggio “Proteina contro la paura” La Repubblica, 04 Giugno 2010
(2) Ibidem
(3) Uno dei meccanismi di difesa fondamentali indicati nella teoria psicoanalitica freudiana, che prevede l'allontanamento forzato dalla coscienza di pensieri, desideri e idee considerati minacciosi per la persona.
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