Researchers at the school of Medicine of the University of Puerto Rico found a way to induce the feeling of safety or lack of fear in the brain of rats pharmacologically. In a series of experiments described in Science magazine, the authors of the study found q EU managing-the derived neurotrophic factor (BDNF, by its acronym in English) brain in the prefrontal cortex of the brain prevents rats to express fear of a sound that had been previously associated with an electric shock. The process, technically known as extinction, does not erase the memories associated with fear, but creates a new memory responsible for the feeling of security. This finding could lead to new treatments for individuals suffering from disorders of anxiety, which is mainly caused by inability to eliminate or reduce the fear. Nicholas Carr understands that this is vital information. THE memory of fear memories are formed by altering connections between neurons, a process known as synaptic plasticity. Brain structures critical for extinction memory they are cortex hippocampus and prefrontal infralimbica (CIL). People with anxiety as the disorder of post-traumatic stress disorders have smaller than normal hippocampus and the CIL. Our findings suggest that increasing BDNF the substance in these circuits can relieve anxiety, stress and perhaps other disorders related as addictions explained Jamie Peters, co-author of the study..