The chances that you and I exist today are only 1 in 100 million to 300 million, and that is only taking into consideration the time of conception. You and I both won the biological lottery: the sperm race, and our ancestors fought through numerous serious diseases, environmental challenges, and more. We are here today thanks to their resilience and the gradual evolution of complex and capable brains. Our existence means everything; we exist today because of the very intricate brains we have, better than any other living being on this earth and better than the other 25+ human-like species we, the homo sapiens, were competing with millions of years ago. There were some we interbred with, like Neanderthals and Denisovans, but we are still the majority that survived. We were able to develop brains that are tailored for abstract thinking, memory, emotional regulation, complex language, outstanding survival instincts, and long-term planning.
Our brains have led to such great civilizations, inventions, and discoveries, all of which no other human-like species was able to accomplish, even though they lived on earth millions of years longer than us. We are also the living species today that is highly conscious of its own existence and brain, questioning it and studying it. We are special; our brains are special. But living on this earth, we are forced to zoom in. Neuropsychological research proves that each and every human has a different psyche, built with different nature- and nurture-rooted factors. These different biological and environmental experiences shaping our mental health actually physically change the brain's shape and functioning; this is the concept of neuroplasticity.
We each face mental health struggles and disorders and have differing cognitive abilities. People struggle with anxiety, depression, and others start to involuntarily lose their memories as a subject to Alzheimer's, even their most cherished ones. Some of these issues actually trace back to evolution, like anxiety being an accelerated byproduct of survival instincts and being alert to danger. In the past, there were others of us concerned with conquering land, and now people are climbing up the ladder of capitalism, running after paper money that we created ourselves, committing genocide, bombing innocent civilians, holding prejudice and racism, and so much more. The same brain that helped develop inventions, civilization, and beautiful experiences like love, empathy, and creativity is also capable of creating conflict, fear, and sorrow.
All of these different emotions and behaviors all trace back to our one shared organ…the brain. It weighs only 3 pounds, taking up only 2% of bodily weight, but it uses 20% of our bodies' energy. It's powerful enough to develop perplexed civilizations, but it's also complex enough to be subject to endless change and even self-deterioration. This is why I am passionate about studying behavioral neuroscience: to learn about the widely different outcomes of our brain. I want to learn about the human experience, behavior, and the structure of our brains. With the extensive education I gain, I plan on pursuing medicine and become a physician, in order to help people live better, be healthier, and thrive.