<unk>  is a neurobiological theory of dreams. In 1983, in a paper published in the science journal Nature, Crick and Mitchison's<unk>  model likened the process of dreaming to a computer in that it was "off-line" during dreaming or the REM phase of sleep. During this phase, the brain sifts through information gathered throughout the day and throws out all unwanted material. According to the model, we dream in order to forget and this involves a process of<unk> ' or 'unlearning'. The cortex cannot cope with the vast amount of information received throughout the day without developing "parasitic" thoughts that would disrupt the efficient organisation of memory. During REM sleep, these unwanted connections in cortical networks are wiped out or damped down by the Crick-Mitchison process making use of impulses bombarding the cortex from sub-cortical areas. The Crick-Mitchison theory is a variant upon Hobson and McCarley's activation-synthesis hypothesis, published in December 1977. Hobson and McCarley hypothesized that a brain stem neuronal mechanism sends pontine-geniculo-occipital (or PGO) waves that automatically activate the mammalian forebrain. By comparing information generated in specific brain areas with information stored in memory, the forebrain synthesizes dreams during REM sleep.
Reverse learning
Functional integration 
Concept creep
Structural competency
Source control 
Interdisciplinarity
Therapeutic relationship
Time trade-off