Scientific American
In 2015, doctors in Germany reported the extraordinary case of a woman who suffered from what has traditionally been called “multiple personality disorder” and today is known as “dissociative identity disorder” (DID). The woman exhibited a variety of dissociated personalities (“alters”), some of which claimed to be blind. Using EEGs, the doctors were able to ascertain that the brain activity normally associated with sight wasn’t present while a blind alter was in control of the woman’s body, even though her eyes were open. Remarkably, when a sighted alter assumed control, the usual brain activity returned.
This was a compelling demonstration of the literally blinding power of extreme forms of dissociation, a condition in which the psyche gives rise to multiple, operationally separate centers of consciousness, each with its own private inner life.
Modern neuroimaging techniques have demonstrated that DID is real: in a 2014 study, doctors performed functional brain scans on both DID patients and actors simulating DID. The scans of the actual patients displayed clear differences when compared to those of the actors, showing that dissociation has an identifiable neural activity fingerprint. In other words, there is something rather particular that dissociative processes look like in the brain.
There is also compelling clinical data showing that different alters can be concurrently conscious and see themselves as distinct identities. One of us has written an extensive treatment of evidence for this distinctness of identity and the complex forms of interactive memory that accompany it, particularly in those extreme cases of DID that are usually referred to as multiple personality disorder.
The history of this condition dates back to the early 19th century, with a flurry of cases in the 1880s through the 1920s, and again from the 1960s to the late 1990s. The massive literature on the subject confirms the consistent and uncompromising sense of separateness experienced by the alter personalities. It also displays compelling evidence that the human psyche is constantly active in producing personal units of perception and action that might be needed to deal with the challenges of life.
Although we may be at a loss to explain precisely how this creative process occurs (because it unfolds almost totally beyond the reach of self-reflective introspection) the clinical evidence nevertheless forces us to acknowledge something is happening that has important implications for our views about what is and is not possible in nature.
Now, a newly published paper by one of us posits that dissociation can offer a solution to a critical problem in our current understanding of the nature of reality. This requires some background, so bear with us.
Read more
In 2015, doctors in Germany reported the extraordinary case of a woman who suffered from what has traditionally been called “multiple personality disorder” and today is known as “dissociative identity disorder” (DID). The woman exhibited a variety of dissociated personalities (“alters”), some of which claimed to be blind. Using EEGs, the doctors were able to ascertain that the brain activity normally associated with sight wasn’t present while a blind alter was in control of the woman’s body, even though her eyes were open. Remarkably, when a sighted alter assumed control, the usual brain activity returned.
This was a compelling demonstration of the literally blinding power of extreme forms of dissociation, a condition in which the psyche gives rise to multiple, operationally separate centers of consciousness, each with its own private inner life.
Modern neuroimaging techniques have demonstrated that DID is real: in a 2014 study, doctors performed functional brain scans on both DID patients and actors simulating DID. The scans of the actual patients displayed clear differences when compared to those of the actors, showing that dissociation has an identifiable neural activity fingerprint. In other words, there is something rather particular that dissociative processes look like in the brain.
There is also compelling clinical data showing that different alters can be concurrently conscious and see themselves as distinct identities. One of us has written an extensive treatment of evidence for this distinctness of identity and the complex forms of interactive memory that accompany it, particularly in those extreme cases of DID that are usually referred to as multiple personality disorder.
The history of this condition dates back to the early 19th century, with a flurry of cases in the 1880s through the 1920s, and again from the 1960s to the late 1990s. The massive literature on the subject confirms the consistent and uncompromising sense of separateness experienced by the alter personalities. It also displays compelling evidence that the human psyche is constantly active in producing personal units of perception and action that might be needed to deal with the challenges of life.
Although we may be at a loss to explain precisely how this creative process occurs (because it unfolds almost totally beyond the reach of self-reflective introspection) the clinical evidence nevertheless forces us to acknowledge something is happening that has important implications for our views about what is and is not possible in nature.
Now, a newly published paper by one of us posits that dissociation can offer a solution to a critical problem in our current understanding of the nature of reality. This requires some background, so bear with us.
Read more
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