The Human Brain's 'Risky Gamble': Choosing Flexible Adaptation Over Rapid Growth

The human brain demonstrates remarkable adaptability in a constantly changing environment. This is the fundamental reason why humans have been able to survive and develop in the face of various challenges, from ancient agricultural societies to the modern information age. At the core of the human brain's ability to adapt across eras is 'brain plasticity.'

Most animals are born with their brain functions almost fully developed. This allows them to immediately perform the functions necessary for survival right after birth, providing an advantage for rapid maturation and survival. However, the human brain chose a different evolutionary path.

The human brain shows an astonishing ability to reassign brain regions that were responsible for a certain part of the body when that part is damaged or lost. Research results clearly demonstrate this neural reorganization. When observing the brain of a person who had an arm amputated, it was found that the brain region previously responsible for the arm began to be encroached upon by other senses or functions.

Unlike other animals, the human brain is born in an incomplete state. This is why a newborn baby has little knowledge of the outside world and cannot even properly move its limbs. Instead, the human brain chooses to learn and grow by studying and experiencing the outside world for itself.

Research into brain plasticity has revealed the intriguing fact that different parts of the brain are not predetermined at birth for specific functions. Instead, each part of the brain takes on the role of processing whatever information it is given. For example, a region that processes visual information can change to process other sensory information if exposed to it.

The speed of brain reorganization was much faster than expected. While it's easy to think of brain plasticity as a long-term phenomenon, actual research observed changes in brain function at a surprising speed. These findings suggest that the brain can react and reorganize very flexibly to environmental changes.

Brain plasticity is actively at work even while we sleep. Especially during REM sleep, the brain uses a unique strategy to maintain the function of its visual processing areas. Even in the absence of external visual information during the day, the brain provides virtual information to the visual areas through dreams, activating and maintaining their function. This shows that the brain constantly processes new information and tries to reuse existing functions even while sleeping.