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In psychology, the psyche is the totality of the human mind, conscious and unconscious. Psychology is the scientific or objective study of the psyche. The word has a long history of use in psychology and philosophy, dating back to ancient times, and represents one of the fundamental concepts for understanding human nature from a scientific point of view. The English word soul is sometimes used synonymously, especially in older texts.
The basic meaning of the Greek word ? (psyche) was "life" in the sense of "breath", formed from the verb ? (psycho, "to blow"). Derived meanings included "spirit", "soul", "ghost", and ultimately "self" in the sense of "conscious personality" or "psyche". Interestingly, associating "spirit" and "breath" is not unique to Greek or western cultures. The Chinese character for "spirit", "soul" is ? (h?n, simplified) which is the merging of ? (y?n) and ? (gu?). ? is commonly used as "clouds" but also as "breath" in expressions such as ? (smoking or vaping). ? is simply "ghost" or "spirit". The linkages between "spirit" and "breath" were formed independently by ancient peoples who at the time did not have any real contact with one another.
The idea of the psyche is central to the philosophy of Plato. In his Phaedo, Plato has Socrates give four arguments for the immortality of the soul and life after death following the separation of the soul from the body. Plato's Socrates also states that after death the Psyche is better able to achieve wisdom and experience the Platonic forms since it is unhindered by the body.
The Greek philosopher Aristotle wrote an influential treatise on the psyche, called in Greek ? (Peri Psyches), in Latin De Anima and in English On the Soul. Aristotle's theory of the "three souls (psyches)" (vegetal, animal, and rational) would rule the field of psychology until the 19th century. Prior to Aristotle, a number of Greek writings used the term psyche in a less precise sense. In late antiquity, Galenic medicine developed the idea of three "spirits" (pneuma) corresponding to Aristotle's three souls. The pneuma psychikon corresponded to the rational soul. The other two pneuma were the pneuma physicon and the pneuma zoticon.
The term psyche was Latinized to anima, which became one of the basic terms used in medieval psychology. Anima would have traditionally been rendered in English as "soul" but in modern usage the term "psyche" is preferable.
19th century psychologists such as Franz Brentano developed the concept of the psyche in a more subjective direction.
Freud's original terms for the three components of the psyche, in German, were das Es (lit. the 'It'), das Ich (lit. the 'I'), and das Über-Ich (lit. the 'Over-I' or 'Upper-I'). According to Bruno Bettelheim, the Latin terms were proposed by Freud's English translators, probably to make them seem more 'medical' since, at the time, Latin was prevalent in medical terminology. Bettelheim deplores what he sees as pseudoscientific, Latin terms.
Carl Jung wrote much of his work in German. Difficulties for translation arise because the German word Seele means both psyche and soul. Jung was careful to define what he meant by psyche and by soul.
I have been compelled, in my investigations into the structure of the unconscious, to make a conceptual distinction between soul and psyche. By psyche, I understand the totality of all psychic processes, conscious as well as unconscious. By soul, on the other hand, I understand a clearly demarcated functional complex that can best be described as a "personality". (Jung, 1971: Def. 48 par. 797)
[The translation of the German word Seele presents almost insuperable difficulties on account of the lack of a single English equivalent and because it combines the two words "psyche" and "soul" in a way not altogether familiar to the English reader. For this reason some comment by the Editors will not be out of place.]
[In previous translations, and in this one as well, psyche--for which Jung in the German original uses either Psyche or Seele--has been used with reference to the totality of all psychic processes (cf. Jung, Psychological Types, Def. 48); i.e., it is a comprehensive term. Soul, on the other hand, as used in the technical terminology of analytical psychology, is more restricted in meaning and refers to a "function complex" or partial personality and never to the whole psyche. It is often applied specifically to "anima" and "animus"; e.g., in this connection it is used in the composite word "soul-image" (Seelenbild). This conception of the soul is more primitive than the Christian one with which the reader is likely to be more familiar. In its Christian context it refers to "the transcendental energy in man" and "the spiritual part of man considered in its moral aspect or in relation to God." ... -- Editors.] (Jung, 1968: note 2 par. 9)
In recent decades cognitive psychology has replaced psychoanalysis as the dominant school of psychology in academic centres. The word "mind" is preferred by cognitive scientists to "psyche".