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"Fundamental to the psychodynamic approach to psychology is the manifestation and nature
of the unconscious psyche. It consists of repressed memories such as traumatic events that are
rarely accessible to awareness, and which have a prolific influence on behaviour (Weston,
1999). Freud (1896) formulated the hydraulic model of the psyche, by which these repressed
memories operate by the first law of thermodynamics. They cannot be created nor destroyed,
only later discharged in the process of energetic reaction, by which one might colloquially
‘blow off steam’. However, by recourse to biopsychology, Bucci (1997) finds no
physiological evidence for this process. More specifically, as a development of the hydraulic
model, Freud (1915) formulated the topographical model of the psyche by dividing the
unconscious into three parts: the subconscious, the preconscious and the unconscious, which
Erdelyi (1985) notes are later defined as the dynamic, descriptive and systemic unconscious.
However, Alfred Adler, a contemporary of Freud, rejected the Freudian interpretation of the
descriptive and systemic unconscious, but accepted the dynamic unconscious, believing that
the unconscious is not repressed in the Freudian sense; it is simply unnoticed (Jarvis, 2010).
Like Adler, Carl Jung also accepted the dynamic conscious but rejected the Freudian
interpretation of a single unconscious as having too many generalisations, and instead divided
it into two parts: the individual and collective, with the latter being strongly influenced by
religious doctrine. Therefore, certain aspects of psychoanalytic theory are more favoured
amongst the contemporaries of Freud than others, and while the hydraulic model may have
validity by recourse to a metaphorical interpretation, there is no evidence to suggest it is
scientifically valid."