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In [[psychology]], [[psychodynamics]] is the study of the interrelationship of various parts of the [[mind]], [[personality]], or [[psyche ]] as they relate to [[mental]], emotional, or motivational forces especially at the [[subconscious ]] level. Roughly [[speaking]], "[[psycho]]-dynamics" is a blend of [[psychology]] and [[thermodynamics]]. A focus in psychodynamics is the connection between the energetics of emotional states in the id, ego, and [[superego ]] as they relate to early [[childhood ]] developments and [[processes]]. Psychodynamics attempts to explain or [[interpret ]] [[behavior ]] or mental states in [[terms ]] of innate emotional forces or processes.

Psychodynamics was [[born ]] with the 1874 publication of ''Lectures on [[Physiology]]'' by [[German ]] [[scientist ]] [[Ernst Wilhelm von Brücke|Ernst von Brucke]] who supposed that all [[living ]] organisms are [[energy]]-systems governed by the [[principle ]] of the conservation of energy. During this year, at the [[University ]] of [[Vienna]], Brucke was also coincidentally the supervisor for first-year medical student [[Sigmund Freud]] who [[naturally ]] adopted this new “dynamic” physiology. Later, the [[theory ]] of psychodynamics was developed further by those such as [[Carl Jung]], [[Alfred Adler]], and [[Melanie Klein]].

The central premise of psychodynamics is based on the [[first law of thermodynamics]], which states that the [[total ]] amount of matter and energy in any [[system ]] under study, which undergoes any transformation or [[process]], is conserved; [[meaning]], essentially, that experiences, especially early childhood experiences, in theory, are conserved in the [[unconscious]]. Subsequently, conserved experiences later in [[life ]] must either remain buried in the mind or find their way to the surface, i.e. the “conscious” level. This, in the former [[case]], results in [[psychological ]] states as [[neurosis]] and [[psychosis]].

Building on the [[work ]] of [[Freud]], [[Carl Jung]] advanced the framework of psychodynamics. According to [[Jung]], the mental sphere, having [[conscious ]] and unconscious parts, is [[divided ]] up into a [[number ]] of interactive relatively [[closed system]]s. The total set of such mental systems takes in energy via sensor input, which energizes the person; however, the [[dynamic ]] distribution of these inputs among the various systems is governed by two principles:{{ref|hall}}

#'''Principle of Equivalence''' – if the amount of energy consigned to a given [[psychic ]] element decreases or [[disappears]], that amount of energy will appear in [[another ]] psychic element.#'''Principle of Entropy''' – the distribution of energy in the psyche seeks equilibrium or [[balance ]] among all the [[structures ]] of the psyche.

Jung modeled these psychological energetic principles on the [[first law of thermodynamics]] and the [[second law of thermodynamics]], respectively. The key [[concepts ]] in Jungian psychodynamics are [[psychic energy]] or [[libido]], [[value]], [[equivalence]], [[entropy]], [[progression]] and [[regression]], and [[canalization]].{{ref|hall2}}

Presently, psychodynamics is an evolving multi-disciplinary field which analyzes and studies [[human ]] [[thought ]] process, response patterns, and influences. Research in this field provides insights into a number of areas, including:

#[[Understanding ]] and anticipating the range of specific conscious and unconscious responses to specific sensory inputs, as [[images]], colors, textures, sounds, etc. #Utilizing the communicative [[nature ]] of movement and [[primal ]] [[physiological ]] gestures to [[affect ]] and study specific mind-[[body ]] states.#Examining the capacity for the mind and senses to directly affect physiological response and [[biological ]] [[change]].