Consciousness, at its simplest, is awareness of internal and external existence. However, its nature has led to millennia of analyses, explanations and debate by philosophers, theologians, and all of science. Opinions differ about what exactly needs to be studied or even considered consciousness. In some explanations, it is synonymous with the mind, and at other times, an aspect of mind. In the past, it was one's "inner life", the world of introspection, of private thought, imagination and volition. Today, it often includes any kind of cognition, experience, feeling or perception. It may be awareness, awareness of awareness, or self-awareness either continuously changing or not. The disparate range of research, notions and speculations raises a curiosity about whether the right questions are being asked.
Julian Jaynes was an American researcher in psychology at Yale and Princeton for nearly 25 years, best known for his 1976 book The Origin of Consciousness in the Breakdown of the Bicameral Mind. His career was dedicated to the problem of consciousness: "the difference between what others see of us and our sense of our inner selves and the deep feelings that sustain it. ... Men have been conscious of the problem of consciousness almost since consciousness began." Jaynes's solution touches on many disciplines, including neuroscience, linguistics, psychology, archeology, history, religion and analysis of ancient texts.
The Origin of Consciousness in the Breakdown of the Bicameral Mind is a 1976 book by the Princeton psychologist, psychohistorian and consciousness theorist Julian Jaynes (1920-1997). It explores the nature of consciousness – particularly "the ability to introspect" – and its evolution in ancient human history. Jaynes proposes that consciousness is a learned behavior rooted in language and culture rather than being innate. He distinguishes consciousness from sensory awareness and cognition. Jaynes introduces the concept of the "bicameral mind", a non-conscious mentality prevalent in early humans that relied on auditory hallucinations.
Cognitive neuroscience is the scientific field that is concerned with the study of the biological processes and aspects that underlie cognition, with a specific focus on the neural connections in the brain which are involved in mental processes. It addresses the questions of how cognitive activities are affected or controlled by neural circuits in the brain. Cognitive neuroscience is a branch of both neuroscience and psychology, overlapping with disciplines such as behavioral neuroscience, cognitive psychology, physiological psychology and affective neuroscience. Cognitive neuroscience relies upon theories in cognitive science coupled with evidence from neurobiology, and computational modeling.
Consciousness Explained is a 1991 book by the American philosopher Daniel Dennett, in which the author offers an account of how consciousness arises from interaction of physical and cognitive processes in the brain. Dennett describes consciousness as an account of the various calculations occurring in the brain at close to the same time. He compares consciousness to an academic paper that is being developed or edited in the hands of multiple people at one time, the "multiple drafts" theory of consciousness. In this analogy, "the paper" exists even though there is no single, unified paper. When people report on their inner experiences, Dennett considers their reports to be more like theorizing than like describing. These reports may be informative, he says, but a psychologist is not to take them at face value. Dennett describes several phenomena that show that perception is more limited and less reliable than we perceive it to be.
Greedy reductionism, identified by Daniel Dennett, in his 1995 book Darwin's Dangerous Idea, is a kind of erroneous reductionism. Whereas "good" reductionism means explaining a thing in terms of what it reduces to, greedy reductionism occurs when "in their eagerness for a bargain, in their zeal to explain too much too fast, scientists and philosophers ... underestimate the complexities, trying to skip whole layers or levels of theory in their rush to fasten everything securely and neatly to the foundation". Using the terminology of "cranes" and "skyhooks" built up earlier in the chapter, Dennett recapitulates his initial definition of the term in the chapter summary on p. 83: "Good reductionists suppose that all Design can be explained without skyhooks; greedy reductionists suppose it can all be explained without cranes."
Eliminative materialism is a materialist position in the philosophy of mind. It is the idea that the majority of mental states in folk psychology do not exist. Some supporters of eliminativism argue that no coherent neural basis will be found for many everyday psychological concepts such as belief or desire, since they are poorly defined. The argument is that psychological concepts of behavior and experience should be judged by how well they reduce to the biological level. Other versions entail the nonexistence of conscious mental states such as pain and visual perceptions.
Split-brain or callosal syndrome is a type of disconnection syndrome when the corpus callosum connecting the two hemispheres of the brain is severed to some degree. It is an association of symptoms produced by disruption of, or interference with, the connection between the hemispheres of the brain. The surgical operation to produce this condition involves transection of the corpus callosum, and is usually a last resort to treat refractory epilepsy. Initially, partial callosotomies are performed; if this operation does not succeed, a complete callosotomy is performed to mitigate the risk of accidental physical injury by reducing the severity and violence of epileptic seizures. Before using callosotomies, epilepsy is instead treated through pharmaceutical means. After surgery, neuropsychological assessments are often performed.
In the philosophy of mind, the user illusion is a metaphor for a proposed description of consciousness that argues that conscious experience does not directly expose objective reality, but instead provides a simplified version of reality that allows humans to make decisions and act in their environment, akin to a computer desktop. According to this picture, our experience of the world is not immediate, as all sensation requires processing time. It follows that our conscious experience is less a perfect reflection of what is occurring, and more a simulation produced subconsciously by the brain. Therefore, there may be phenomena that exist beyond our peripheries, beyond what consciousness could create to isolate or reduce them.
Hearing Voices Networks, closely related to the Hearing Voices Movement, are peer-focused national organizations for people who hear voices and supporting family members, activists and mental health practitioners. Members may or may not have a psychiatric diagnosis. Networks promote an alternative approach, where voices are not necessarily seen as signs of mental illness and regard hearing voices as a meaningful and understandable, although unusual, human variation. Voices are not seen as the problem, rather it is the relationship the person has with their voices that is regarded as the main issue.
Michael S. Gazzaniga is a professor of psychology at the University of California, Santa Barbara in the USA, where he heads the new SAGE Center for the Study of the Mind. He is one of the leading researchers in cognitive neuroscience, the study of the neural basis of mind. He is a member of the American Academy of Arts & Sciences, the Institute of Medicine, and the National Academy of Sciences.
Joseph E. Bogen was an American neurophysiologist who specialized in split brain research and focused on theories of consciousness. He was a clinical professor of neurosurgery at the University of Southern California, Adjunct Professor of Psychology at UCLA, and a visiting professor at Caltech.
The lateralization of brain function 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.
Ernest Ropiequet "Jack" Hilgard was an American psychologist and professor at Stanford University. He became famous in the 1950s for his research on hypnosis, especially with regard to pain control. Along with André Muller Weitzenhoffer, Hilgard developed the Stanford Hypnotic Susceptibility Scales. A Review of General Psychology survey, published in 2002, ranked Hilgard as the 29th most cited psychologist of the 20th century.
Brian J. McVeigh is an American scholar of Asia who specializes in Japanese pop art, education, politics, and history. He is also a theorist of cultural psychology and historical changes in human mentality. He received his doctorate in 1991 from Princeton University's Department of Anthropology. While a graduate student, he studied under Julian Jaynes whose influence is apparent in his research. He taught at the University of Arizona until 2013 and is a licensed mental health counselor. Currently he is researching how a Jaynesian psychology can be developed for therapeutic purposes, as seen in his The Self-healing Mind: Harnessing the Active Ingredients of Psychotherapy.
The Master and His Emissary: The Divided Brain and the Making of the Western World is a 2009 book written by psychiatrist Iain McGilchrist that deals with the specialist hemispheric functioning of the brain. The differing world views of the right and left brain have, according to the author, shaped Western culture since the time of the ancient Greek philosopher Plato, and the growing conflict between these views has implications for the way the modern world is changing. In part, McGilchrist's book, which is the product of twenty years of research, reviews the evidence of previous related research and theories, and based on this and cultural evidence, the author arrives at his own conclusions.
Terence Hawkins is an American author of numerous short stories and two novels, American Neolithic, published by C&R Press, and The Rage of Achilles, a recounting of The Iliad in the form of a novel. In 2016, Hawkins pleaded guilty to one count of larceny for embezzling almost half a million dollars that had belonged to the clients of his law office. He has since been released from prison.
The left-brain interpreter is a neuropsychological concept developed by the psychologist Michael S. Gazzaniga and the neuroscientist Joseph E. LeDoux. It refers to the construction of explanations by the left brain hemisphere in order to make sense of the world by reconciling new information with what was known before. The left-brain interpreter attempts to rationalize, reason and generalize new information it receives in order to relate the past to the present.
The collective cognitive imperative is an internal command or obligation felt by suggestible people that often drives their joining some group. Besides requiring the person accept the group’s belief system, it outlines culturally agreed on behavioral constraints and roles to be acted out. While the group is usually thought of as a formally well-defined one such as a tribe, church, cult, or commune, this imperative can be less rigorously connected to peer pressure—in which case it can apply to ill-defined groups like being "a cool person". It can likewise be related to joining the "winners" through "The Bandwagon Effect".
Dual consciousness is a hypothetical concept in neuroscience. It is proposed that it is possible that a person may develop two separate conscious entities within their one brain after undergoing a corpus callosotomy. The idea first began circulating in the neuroscience community after some split-brain patients exhibited the alien hand syndrome, which led some scientists to believe that there must be two separate consciousnesses within the brain's left and right hemispheres in competition with one another once the corpus callosum is severed.
