There are 56 other employees, including doctors, psychologists, nutritionists, cooks and physiologists. In the modern age, psychologists and physiologists explored female sexuality. Following her discovery, Genie was followed by scientists, physiologists, and linguists. In recent years, plant physiologists have examined the physiology of plant behavior and cognition. Echocardiography is performed by cardiac sonographers, cardiac physiologists (UK), or physicians trained in echocardiography. It has around 50 employees including scientists and physiologists. However, anti-vitalist experimental physiologists and embryologists, especially in Europe, were increasingly influential. Environmental physiologists also examine plant response to biological factors. Water hammer also interested physiologists who were studying the circulatory system. Non-REM and REM sleep are so different that physiologists identify them as distinct behavioral states. He was one of the first experimental physiologists through his vivisection experiments on animals. In the United States, physiologists Drs. Peristalsis was discovered in 1899 by the work of physiologists William Bayliss and Ernest Starling. They were removed from their mother's custody at birth to be studied by Soviet physiologists. He was also among the first experimental physiologists.