Echographie (from lat. actus - action and Greek. grapho - write) - automatic registration of motor activity. The most widely used ecografia for studying motor activity of animals during periods of sleep and wakefulness. In addition, actigraphy is used to register movements during sleep, or movements of patients with bed regime. Ecografia animals carried out with a help of hectographs. Actigraph - cell with a moving floor. Fluctuations sex, induced by the movements of animals that are caught are located under the floor of the perceiver sensors (mechanical, pneumatic or electric). In the most simple constructions fluctuations floor through a system of levers or through the air transfer register on low speed moving the ribbon daily kymograph (barograph). In echographie Seipelt and wolf floor cells is a tough membrane, whose vibrations in the form of sound waves is captured by the microphone and converted into electrical impulses that drive the anchor of the solenoid, connected with the pen of a drum. Obtained with the help of such actigraphs curves do not reflect the shape of the motor activity, although give an idea of the distribution of General motor activity of the animal in time and intensity. In some cases apply registration methods, allows to divide the movement of the animal vertical and horizontal movement to food, etc. for short experiments on small animals are used motile cells, the offset of which is caused by the movements of the animal, are transmitted to a recording device. In the first echographie Stewart was used rotary drum-cell. The movement of the animal in the cage was measured by the speed of the drum respectively distance. Currently apply motile cells suspended on corrugated hose or on the springs by which to measure the displacement of the cell. Registration of a person's movements during sleep, usually carried out using a pneumatic sensors placed in the bed under the mattress or pillow (Fig). Cm. also Movement.