The idea that all psychological events have an underlying cause is better known as

- Psychic determinism.

Explanation:

'Psychic determinism' is illustrated as the idea which states that 'all the psychological or mental events do not occur accidentally or by chance but instead have a fundamental cause that could be revealed or determined by the analysis of the complexities of the unconscious and pre-existing mental thoughts or instincts. It describes that human conduct is the consequence of previous(childhood) experiences and intrinsic drives. It attempts to disclose to the unconscious affiliations that are associated with a particular behavior or conduct.

answer; affirm trail court findings of fact;