Feeling was originally used to describe the physical sensation of touch through either experience or perception. The word is also used to describe other experiences, such as "a feeling of warmth" and of sentience in general. In psychology, the term feeling is closely related to emotion, and usually refers to the conscious subjective experience of emotions. The study of subjective experiences is referred to as phenomenology, whereas psychotherapy refers to a process whereby a therapist helps a client understand their own feelings and experiences. Feelings are also known as a state of consciousness.