Glossary U

Glossary U

Ultradian rhythm refer to the 90-minute cycles of heightened and lowered brain Arousal observed throughout the wake/sleep c

Ultrasonography refers to a procedure for imaging the internal structures of the body by introducing and recording the reflection of high-frequency sound waves.

Ultraviolet (UV) light refers to the radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays.Ultraviolet light is a wavelength that is above violet in the

Ultraviolet A is one of the three types of invisible light rays (together with ultraviolet B and ultraviolet C) given off by the sun. Although ultraviolet C is the most dangerous type of ultraviolet light in terms of its potential to harm life on earth, it cannot penetrate earth's protective ozone layer.

The Ultraviolet Forensic Imaging is the use of ultraviolet lights to enhance details in photographs.

Ultraviolet (UV) rays refer to sunrays associated with skin cancer.

Umwelt is Binswanger's term for the physical world, relating to the environment, the objects and living beings within it; attending to the biological and physical aspects of the world.

Unaided recall refers to a questioning approach in which the respondent is asked to remember an object of interest without the assistance of clues from the researcher.