Out-of-body experiences: Neuroscience or the paranormal?
By Tim Newman / Medical News Today
As you lie in slumber, your spirit body snaps free and drifts upward while your physical shell is left lonely on the bed below, connected only by a fragile, silvery cord. You turn and observe yourself peacefully sleeping. Could this be evidence of the soul? Could it be proof of life after death?
In the 19th century, for instance, OBEs became a popular topic of the romantic literary movement, and unsurprisingly, they were eagerly discussed by early psychical researchers.
Although, historically, most research into OBEs has come from the unkempt fringes of science, it has attracted a little more serious attention over recent years. In this article, we will discuss some of these findings.
When do OBEs occur?
Sleep: Spontaneous OBEs are most commonly reported as occurring just before falling asleep or just prior to waking. They are more likely to occur when sleep is not particularly deep - due to noise, stress, or illness, for example.
Physical effort: OBEs have also been reported following or during extreme exertion.
Near-death experiences (NDEs): OBEs sometimes occur alongside "light at the end of the tunnel" visions.
Other spontaneous OBEs have been reported during meditation, non-life-threatening accidents, anesthesia, hypnosis, child birth, when suffocating, after being shot, while dancing or talking, or, as one 36-year-old police officer relates, during her first night at work.
Drugs: Hallucinogenic drugs, and dissociative hallucinogenics in particular - such as DMT, MDA, LSD, and ketamine - can give rise to induced OBEs.
Sensory deprivation or overload: Either too little sensory information (floatation tanks or listening to white noise) or too much (torture) can also trigger them.
Strong G-forces: Pilots and astronauts occasionally experience OBEs. For instance, when extreme G-forces are encountered, blood can partially drain from certain parts of the brain. This, it seems, has the power to induce an OBE.
In this instance, OBEs occur as part of a phenomenon called "gravity-induced loss of consciousness." The more surreal parts of this experience are not freely discussed by most pilots, but some give vivid accounts.
SD is considered one of the most common factors contributing to aviation accidents. Fatigue, stress, drugs, low light levels, and sensory overload or deprivation are among the factors potentially involved.
Verifying veridical perception
A well-known example is the case of Pam Reynolds, a brain surgery patient who underwent a highly invasive operation to remove a brain tumor.
Although skepticism abounds, proponents of the afterlife have repeatedly used this story as "evidence" of an ability to float beyond the body.
Some of these stories are intriguing and compelling. But at this stage, they are nothing more than unverifiable stories.
A study from 2014, titled Awareness during Resuscitation (AWARE), was the first serious large-scale investigation to look at NDEs. The study addressed the possibility of veridical perception during OBEs.
The research involved multiple hospitals and hundreds of interviews with cardiac arrest survivors. To investigate whether any individuals had genuinely floated above themselves and viewed their surroundings, researchers placed pictures on shelves that would only be viewable from above. In this way, they could test whether people experiencing OBEs really could leave their bodies.
Although there were only two veridical OBEs during the study, neither could accurately relate the images from the shelves. We eagerly await the next phase, known as AWARE II. As the authors write, "Another veridical recall is a real possibility in the 1,000+ monitored cases, and who knows, that ever elusive visual recall may yet be found."
Direct brain stimulation
The patient relayed a sensation of "falling from a height." As they increased the current, she said, "I see myself lying in bed, from above, but I only see my legs and lower trunk."
Our brains do such a wonderful job of pinning us in reality that we often forget that the pins are an illusion and can, therefore, sometimes be shaken loose. Blanke, one of the scientists involved in the Swiss experiment, believes, "OBEs are related to a failure to integrate multisensory information from one's own body at the temporoparietal junction (TPJ)."
In another study conducted by Blanke, he and his team studied six neurological patients with brain lesions that caused them to experience occasional OBEs. They found "the angular gyrus to be involved in all five patients in whom lesion analysis could be performed."
What does the temporoparietal junction do?
The TPJ is an area that collates a range of information. It is a hub of activity, with inputs from the thalamus (which relays sensory information) and the limbic system (which is important in emotion and memory). It also takes data from the visual, auditory, and somatosensory (bodily sensations) systems.
The TPJ integrates information from the external environment as well as from within the body. It is thought to play a part in the distinction between self and other, which makes the TPJ a prime contender for the seat of OBEs.
Why OBEs should happen to people who are otherwise healthy is still a mystery. But perhaps the illusion is, physiologically, no more significant than many other tricks of the mind that we take in our stride, such as déjà vu. The difference with OBEs is that they attack our sense of self, something that we hold dear yet take for granted.
We have all seen ourselves from outside, in mediums such as photos and mirrors. We have all seen rooms from above, and weaved fairytales in our minds. Therefore, it is not such a push to imagine that our brains could manufacture an OBE and present it to us as a fleeting reality.
Our brain does a mighty job of hiding the truth from us. We feel as though we are a solid, singular entity, with our mind and body combined and secure in their rightful places, a monolith in the cosmos. OBEs unravel this sense of self, proving that we are little more than a skillful neurological illusion after all.
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