Divided consciousness is a term coined by Ernest Hilgard to define a psychological state in which one's consciousness is split into distinct components, possibly during hypnosis.
The theory of a division of consciousness was touched upon by Carl Jung in 1935 when he stated, "The so-called unity of consciousness is an illusion... we like to think that we are one but we are not." Ernest Hilgard believed that hypnosis causes a split in awareness and a vivid form of everyday mind splits. Drawing themes from Pierre Janet, Hilgard viewed hypnosis from this perspective as a willingness to divide the main systems of consciousness into different sectors. He argued that this split in consciousness can not only help define the state of mind reached during hypnosis, but can also help to define a vast range of psychological issues such as dissociative identity disorder.
In Hilgard's Divided Consciousness Reconsidered, he offers many examples of "dissociated" human behavior. With regard to theory, he does state that it is useful to assign two modes of consciousness, a receptive mode and an active mode—that is, a bimodal consciousness. In other places he mentions the concept of coconsciousness, wherein two or more states of consciousness may be equally receptive or active, as, for example, in some types of dissociative personalities.
Many psychological studies assume a unity of consciousness. Doubt is cast on this assumption by psychophysical studies in normal subjects and those with blindsight showing the simultaneous dissociation of different modes of reporting of a sensation, and by clinical studies of anosognosic patients showing dissociations of awareness of their own states. These and other phenomena are interpreted to imply two kinds of division of consciousness: the separation of phenomenal experience from reflexive consciousness and the non-unity of reflexive consciousness. Reflexive consciousness is taken to be necessary for report and is associated with ‘the self’ as the subject of experience and its own agent of reporting.
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Bicameral mentality is a hypothesis introduced by Julian Jaynes who argued human ancestors as late as the Ancient Greeks did not consider emotions and desires as stemming from their own minds but as the consequences of actions of gods external to themselves. The theory posits that the human mind once operated in a state in which cognitive functions were divided between one part of the brain which appears to be "speaking", and a second part which listens and obeys—a bicameral mind, and that the breakdown of this division gave rise to consciousness in humans.
Alien hand syndrome (AHS) or Dr. Strangelove syndrome is a category of conditions in which a person experiences their limbs acting seemingly on their own, without conscious control over the actions. There are a variety of clinical conditions that fall under this category, which most commonly affects the left hand. There are many similar terms for the various forms of the condition, but they are often used inappropriately.
The lateralization of brain function (or hemispheric dominance/ latralisation ) is the tendency for some neural functions or cognitive processes to be specialized to one side of the brain or the other. The median longitudinal fissure separates the human brain into two distinct cerebral hemispheres, connected by the corpus callosum. Although the macrostructure of the two hemispheres appears to be almost identical, different composition of neuronal networks allows for specialized function that is different in each hemisphere.