A sensor, for measuring an electrical signal, includes a compressible body portion defining a longitudinal axis and having a foldable wall extending from a first end of the body portion to a second end of the body portion. The body portion is movable from a decompressed state to a compressed state by moving the first end along the longitudinal axis relative to the second end. The wall includes fold lines formed therein such that, during movement of the body portion from the decompressed state to the compressed state, the wall is folded along the fold lines. The sensor further includes an electrode portion connected to the body portion and comprising an electrode for measuring the electrical signal.

The presently disclosed subject matter relates to a play environment for children and infants for detecting motor delays or impairments, evaluating neurological development, and for diagnosing developmental disorders, and methods and systems of using the same.

A robot that can naturally acquire highly reliable biological information is provided. The robot according to one aspect of the present invention is a robot configured to acquire, in contact with or in proximity to a user, biological information of the user, and including an exterior member, a detector configured to acquire the biological information, using an electromagnetic wave, and a controller configured to control an operation of at least one of the robot or the detector such that at least one of an orientation, position, or pose of the detector relative to the user changes based on the biological information acquired by the detector.

A sleep system including an analysis unit configured to be in data communication with a plurality of sensors, the sensors being selected from one or more sound sensors, biological sensors, environmental sensors, motion sensors, or a combination thereof.