In this blog post, we’ll explore the characteristics of neuroscience—where various disciplines intersect—as well as its research methods and future potential.
Why is neuroscience a field where researchers from diverse disciplines collaborate?
It’s easy to assume that medical school has a more predetermined career path than other academic programs, given that graduates become doctors. However, medicine—which explores the human body—is divided into a wide variety of subfields, and because it actively interacts with other disciplines, the range of career paths available is actually quite diverse. Among the body’s organs, the brain is one of the least understood yet most important. Commonly referred to as neuroscience, this field brings together various disciplines—centered on medicine but also including chemistry, physics, engineering, and pharmacy—to uncover the principles governing the human mind and the brain’s functioning. So, let’s examine what neuroscience studies and how this research is conducted, building on a foundation of basic knowledge about the brain.
In the past, it was believed that the human mind and emotions originated in the heart. However, it has now been established that most mental activities—including thought, emotion, and personality—are the result of electrochemical processes occurring in the brain. The brain consists of nerve cells called neurons, glial cells that support their functions, and surrounding tissue. As the most vital organ, the brain receives a continuous and sufficient supply of blood through blood vessels, and the skull that protects it is also a structure of extremely high strength. These characteristics alone give us an idea of just how crucial a role the brain plays in the human body.
What is the structure of the brain, and how does it function?
First, let’s divide the brain into major sections and examine the functions of each part. The large, highly folded region that typically comes to mind is called the cerebrum. The relatively small, folded structure located at the back of the cerebrum is called the cerebellum, and the cerebrum is also connected to the midbrain, pons, and medulla oblongata. Most cognitive processes, emotions, and the storage of long-term memory take place in the cerebrum. In contrast, the cerebellum plays a crucial role in precisely controlling movement and maintaining the body’s balance. The midbrain is involved in eye movements and reflexes, while the pons and medulla oblongata are responsible for basic physiological functions essential for sustaining life, such as breathing and heartbeat.
The neurons described earlier are the ones that actually perform these functions in each region. Compared to the brain’s complex functions, the basic operating principle of neurons is relatively simple. Neurons receive external stimuli and transmit them as electrical signals. If a stimulus exceeds a certain threshold, an action potential is generated to transmit the signal; otherwise, no signal is sent. Because of this characteristic, the operating principle of neurons is sometimes compared to the binary system used in computers. Neurons form a highly complex network with one another, and the electrical signals generated within this network give rise to our thoughts and behaviors. Furthermore, by analyzing the level of neuronal activity in specific brain regions, it is possible to infer which functions are being performed at that moment.
How is neuroscience studied, and in what direction will it develop in the future?
The most direct method of studying the brain is to observe its structure and investigate the changes that occur when electrical stimulation is applied to specific areas. However, modern neuroscience allows us to study the brain using various imaging techniques without opening the skull. One of the most widely used devices is CT, which utilizes X-rays. CT is a technology that uses the differing X-ray transmission rates of various tissues to reconstruct cross-sectional images taken from multiple angles using a computer. MRI precisely visualizes the brain’s structure by analyzing the signals from hydrogen atoms within the body using strong magnetic fields and radio waves. In addition, various research tools are utilized, such as NIRS, which measures changes in cerebral blood flow using near-infrared light, and EEG, which measures electrical signals generated by the brain. Most brain science research involves comparing the state of a specific brain region when it is activated versus when it is not, or analyzing functional differences based on changes in the distribution of specific substances.
The brain was once considered a realm of the unknown, with far more remaining to be discovered than had already been revealed, and extensive research is still ongoing today. As various disciplines collaborate to study the brain, brain science has established itself as a leading interdisciplinary field.
Basic sciences such as chemistry, biology, and physics play a crucial role in understanding the microscopic phenomena occurring in the brain, while pharmacology contributes to the development of various substances that act on the brain and therapeutic agents. Furthermore, engineering, through the field of neuroengineering, is making significant contributions to the development of brain-mimicking models and the analysis of the brain’s structure and function. This research extends beyond basic science. It is widely applied not only to the treatment of neurodegenerative diseases such as Alzheimer’s and Parkinson’s but also to the development of various medical devices—including artificial retinas and cochlear implants—as well as brain-computer interface (BCI) technology. As such, neuroscience is rapidly advancing, attracting interest and investment from diverse fields, and is expected to continue playing a vital role as a central discipline where multiple disciplines grow together.
