Posts Tagged ‘global workspace theory’

A Needed Post on Consciousness

July 9, 2018

This post is inspired by an article in the 23 June 2018 issue of the New Scientist by Per Snaprud titled “Consciousness: How We’re Solving a Mystery Bigger than Our Minds.” The truth is that they are not solving a mystery. Unfortunately there are scientists who regard themselves as being rigorous who are strict determinists and who cannot abide the notion of free will. They are trying to solve consciousness as something that we do not control and in which we view our lives in a deterministic manner.

First of all, they need to accept the concept of free will. Entering “free will” into the search block of the healthymemory blog will yield many previous posts on this topic. The post titled “Free Will” is a review of a book by the same title by the philosopher Mark Ballagher. The book is in MIT’s Essential Knowledge Series, and HM would certainly agree that this knowledge is essential.

Consciousness is something we all experience, and we can experience consciousness in a passive mode. As long as we’re awake, we have a conscious experience. And even during sleep we dream. The Global Workspace Theory states that specialized modules send messages into a vast network where they compete for dominance. The winner is broadcast globally and enters consciousness. This is an accurate description of consciousness in its passive mode. What it does not explain is consciousness in the active mode

We can focus consciousness on particular topics. A failure to do so would lead to incoherent, disastrous lives. One of the goals of meditation is to focus and control our consciousness. There are many benefits to meditation. Accordingly, there are many posts on meditation and mindfulness. Undoubtedly our ability to focus and to meditate is one of our executive functions that is found in the prefrontal cortex.

Please review the numerous posts on meditation and mindfulness to review the many benefits of gaining control of our conscious minds. One post of special importance is titled “The Genetic Breakthrough—Your Ultimate Mind Body Connection.” Enter [Mind Body Connection] in the healthymemory blog search block to access this post.

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Theorizing Consciousness

April 6, 2016

“Theorizing Consciousness” is the fifth chapter of “Consciousness and the Brain:  Deciphering How the Brain Codes our Thoughts” an outstanding book by the French neuroscientist Stanislas Dehaene who is the Chair of Experimental Psychology at the College of France.  This is the sixth consecutive post on this outstanding book.   At this point a theory is needed to explain how subjective introspection relates to objective measurements.  Dr. Dehaene does this  by introducing the notion of a global neuronal workspace.  This global workspace theory was developed along with the psychologist Bernard Baars.

The notion is simple.  Consciousness is brain-wide information sharing.  The human brain has developed efficient long-distance networks, particularly in the prefrontal cortex, to select relevant information and disseminate it throughout the brain.  Consciousness has evolved  to allow us to attend to a piece of information and disseminate it throughout the brain.  Once the information is conscious, it can be flexibly be routed  to other areas according to our current goals.  We can name this information, evaluate it, memorize it, and use it to plan for the future.  We can use it to simulate the prospects of different courses of action.  Computer simulations of neural networks have been run and shown that the global neuronal workspace hypothesis generates precisely the signatures we see in experimental brain recordings.

Many neurons  in the brain differ substantially from other cells in the body.  These are the neurons with exceptionally long axons.   These neurons are most abundant in the prefrontal cortex.   Moreover, each human prefrontal neuron  may host fifteen thousand spines or more. This allows these neurons to transmit information to distant parts of the brain, making the global neuronal workspace truly global.   The prefrontal cortex is the area responsible for decision making and executive control.

The global neuronal workspace hypothesis also explains why vast amounts of knowledge remain inaccessible to our consciousness, namely, there is too much of it. Global workspace theory helps bring order to this jungle of information.  It leads us to pigeonhole our unconscious feats in distinct bins whose brain mechanisms differ radically. There is only a limited amount of attentional resources that can be devoted to conscious processing.  One can argue that the judicious selection of what information to attend to and to devote conscious thought is one of the primary determinant of a happy and successful life.  This is a primary reason why meditation is important.  Contemplation and meditative exercises provide practice in training our attention.