Movement disorders are a group of neurological conditions that affect a person's ability to control their voluntary movements. These disorders can involve either too much movement (hyperkinesias) or too little movement (hypokinesias), and can result in symptoms such as tremors, muscle rigidity, and difficulty coordinating movements. Some common examples of movement disorders include Parkinson's disease, essential tremor, dystonia, and Huntington's disease. These disorders can be caused by a variety of factors, including genetics, brain injuries, infections, and exposure to toxins. Research in the field of movement disorders focuses on developing treatments to alleviate symptoms, understanding the underlying causes of these disorders, and improving the quality of life for individuals living with these conditions. This research often involves studying the brain and nervous system, conducting clinical trials of new medications or therapies, and exploring the potential of emerging technologies, such as deep brain stimulation, to improve movement disorders.