Reverse learning is a neurobiological theory of dreams. In 1983, in a paper[1] published in the science journal Nature, Crick and Mitchison's reverse learning 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 supposedly 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 'reverse learning' or 'unlearning'. Reverse learning eliminates unwanted modes of neural network interaction acquired in the adult mammal's learning and also in the process of fetal brain growth; therefore, there is a possibility that abnormalities of reverse learning in the fetal brain might explain some aspects of the autistic syndromes or other neurodevelopmental disorders.[2]
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 supposedly 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,[3] 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.