
In Lacanian Psychoanalysis the term desire designates the impossible relation that a subject has with object petit a . "Object petit a" means unattainable object of desire. It is sometimes called the object cause of desire. According to French psychoanalyst and psychiatrist Jaques Lacan(1901 – 1981), desire proper (in contrast with demand) can never be fulfilled.
Lacan argues that desire first occurs during a "mirror phase" of a baby's development, when the baby sees an image of wholeness in a mirror which gives them a desire for that being. As a person matures, Lacan claims that they still feel separated from themselves by language, which is incomplete, and so a person continually strives to become whole. He uses the term "jouissance" to refer to the lost object or feeling of absence which a person believes to be unobtainable.