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In the last few decades, scientists have shown that you actually can re-grow brain cells and you can change the structure and function of your brain by the way you think.
For years, scientists believed the brain's structure couldn't be changed. The new science of neuroplasticity says that's not the case, and argue the brain is much more flexible than previously thought.
Positive words, such as “peace” and “love,” can alter the expression of genes, strengthening areas in our frontal lobes and promoting the brain’s cognitive functioning. They propel the motivational centers of the brain into action, according to the authors, and build resiliency. Conversely, hostile language can disrupt specific genes that play a key part in the production of neurochemicals that protect us from stress. Humans are hardwired to worry — part of our primal brains protecting us from threats to our survival — so our thoughts naturally go here first. However, a single negative word can increase the activity in our amygdala (the fear center of the brain). This releases dozens of stress-producing hormones and neurotransmitters, which in turn interrupts our brains’ functioning. (This is especially with regard to logic, reason, and language.) “Angry words send alarm messages through the brain, and they partially shut down the logic-and-reasoning centers located in the frontal lobes,” write Newberg and Waldman.
By holding a positive and optimistic [word] in your mind, you stimulate frontal lobe activity. This area includes specific language centers that connect directly to the motor cortex responsible for moving you into action. And as our research has shown, the longer you concentrate on positive words, the more you begin to affect other areas of the brain. Functions in the parietal lobe start to change, which changes your perception of yourself and the people you interact with. A positive view of yourself will bias you toward seeing the good in others, whereas a negative self-image will include you toward suspicion and doubt. Over time the structure of your thalamus will also change in response to your conscious words, thoughts, and feelings, and we believe that the thalamic changes affect the way in which you perceive reality.