Definition: The word "neurology" refers to the study of the nervous system, which is composed of nerves that carry signals from the brain to various parts of the body. The word "neurologist" refers to a person who specializes in treating neurological disorders such as Alzheimer's disease, Parkinson's disease, and multiple sclerosis. Neurologists use a variety of diagnostic methods to identify and treat diseases related to the nervous system, including neuroimaging (such as MRI or CT scans) and brain scans. The word "neurofeedback" refers to the process of using sensors and software to monitor and improve neurological function in individuals with neurological disorders such as Alzheimer's disease, Parkinson's disease, and multiple sclerosis. Neurofeedback uses a variety of techniques such as electrical stimulation and biofeedback to stimulate brain activity, improve motor coordination, and reduce symptoms. The word "neuroscientist" refers to a person who specializes in studying the behavior of the nervous system at a cellular level, including how different parts of the nervous system work together to process information. Neuroscientists use computer simulations and experiments to understand how neurons communicate with each other, how signals are transmitted across the nervous system, and how diseases such as Alzheimer's disease affect the brain. The word "neurotransmitter" refers to a chemical substance that is released by nerve cells in response to an electrical or mechanical stimulus. Neurotransmitters play a critical role in regulating the activity of neurons and promoting their function. For example, dopamine is a neurotransmitter that is released by certain cells in the brain and helps to regulate reward and pleasure centers. The word "neurodegeneration" refers to the loss of nerve cells and tissue in the brain as a result of degeneration or injury from various causes such as age-related diseases, smoking, alcoholism, or radiation. Neurodegenerative disorders include Alzheimer's disease, Parkinson's disease, multiple sclerosis, and Huntington's disease. The word "neurogenesis" refers to the process by which new neurons are created in the brain when a cell has died. This process is essential for the normal function of the nervous system and is involved in the development of new neurons during childhood and adolescence. Neurogenesis includes the growth and proliferation of neural tissue, such as myelination (the process of connecting nerve cells together) and gliogenesis (the process of forming new brain tissue). The word "neurosurgeon" refers to a person who specializes in treating neurological disorders using surgical techniques and other therapies, including minimally invasive surgery. Neurosurgeons use a variety of instruments and techniques such as endoscopic surgeries (such as laser surgery or radiofrequency ablation) and microsurgery (using small incisions or tiny needles) to treat brain tumors, strokes, and other neurological disorders. The word "neurologist" refers to a person who specializes in treating neurological disorders using diagnostic methods and treatment plans. Neurologists use a variety of diagnostic tools and procedures such as neuroimaging (such as MRI), blood tests, electroencephalogram (EEG) measurements, and computerized tomography (CT scans). They also provide individualized care for patients with specific neurological conditions, including Alzheimer's disease and Parkinson's disease.