Neuro-imaging – Healing the wounded spirit

January 28, 2014January 29, 2014

Where the imaginal appears real: a positron emission tomography study of auditory hallucinations

Abstract

An auditory hallucination shares with imaginal hearing the property of being self-generated and with real hearing the experience of the stimulus being an external one. To investigate where in the brain an auditory event is “tagged” as originating from the external world, we used positron emission tomography to identify neural sites activated by both real hearing and hallucinations but not by imaginal hearing. Regional cerebral blood flow was measured during hearing, imagining, and hallucinating in eight healthy, highly hypnotizable male subjects prescreened for their ability to hallucinate under hypnosis (hallucinators). Control subjects were six highly hypnotizable male volunteers who lacked the ability to hallucinate under hypnosis (nonhallucinators). A region in the right anterior cingulate (Brodmann area 32) was activated in the group of hallucinators when they heard an auditory stimulus and when they hallucinated hearing it but not when they merely imagined hearing it. The same experimental conditions did not yield this activation in the group of nonhallucinators. Inappropriate activation of the right anterior cingulate may lead self-generated thoughts to be experienced as external, producing spontaneous auditory hallucinations.

PMID:: 9465124; [PubMed – indexed for MEDLINE]
PMCID:: PMC19222

Free PMC Article

January 14, 2014January 29, 2014

Implications of spiritual experiences to the understanding of mind-brain relationship.

OBJECTIVE:

While there has been a large increase in scientific studies on spirituality, there has been too few of studies of the core of spirituality: spiritual experiences (SE), which often involve altered states of consciousness, reports of anomalous experiences and of consciousness beyond the body. This paper argues that SE, although usually neglected in debates regarding mind-brain relationship (MBR), may provide the much needed enlargement of the empirical basis for advancing the understanding of the MBR.

METHODS:

This paper briefly presents and discusses recent scientific investigations on some types of SE (meditative states, end of life and near death experiences, mediumship and alleged memories of previous lives) and their implications to MBR.

RESULTS:

Neurofunctional studies of SE have shown that they are related to but not necessarily caused by complex functional patterns in several brain areas. The study of meditative states, as voluntarily induced mind states that influence brain states has been a privileged venue to investigate top-down (mind over brain) causation. End of life and near death experiences offer cases of unexpected adequate mental function under severe brain damage and/or dysfunction. Scientific investigations of several types of SE have provided evidence against materialistic reductionist views of mind.

CONCLUSIONS:

The recent trend to scientifically investigate SE has already produced interesting and thought-provoking findings that deserve careful further exploration. Because of their potential implication, these findings may also contribute to the understanding of MBR, which remains an important, yet poorly explored way to investigate human nature.

KEYWORDS:

Consciousness, Mind, Mind–brain problem, Mind–brain relationship, Spiritual experiences, Spirituality

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January 14, 2014January 29, 2014

Neuroimaging during trance state: a contribution to the study of dissociation.

Abstract

Despite increasing interest in pathological and non-pathological dissociation, few researchers have focused on the spiritual experiences involving dissociative states such as mediumship, in which an individual (the medium) claims to be in communication with, or under the control of, the mind of a deceased person. Our preliminary study investigated psychography – in which allegedly “the spirit writes through the medium’s hand” – for potential associations with specific alterations in cerebral activity. We examined ten healthy psychographers – five less expert mediums and five with substantial experience, ranging from 15 to 47 years of automatic writing and 2 to 18 psychographies per month – using single photon emission computed tomography to scan activity as subjects were writing, in both dissociative trance and non-trance states. The complexity of the original written content they produced was analyzed for each individual and for the sample as a whole. The experienced psychographers showed lower levels of activity in the left culmen, left hippocampus, left inferior occipital gyrus, left anterior cingulate, right superior temporal gyrus and right precentral gyrus during psychography compared to their normal (non-trance) writing. The average complexity scores for psychographed content were higher than those for control writing, for both the whole sample and for experienced mediums. The fact that subjects produced complex content in a trance dissociative state suggests they were not merely relaxed, and relaxation seems an unlikely explanation for the underactivation of brain areas specifically related to the cognitive processing being carried out. This finding deserves further investigation both in terms of replication and explanatory hypotheses.

PMID:: 23166648; [PubMed – indexed for MEDLINE]
PMCID:: PMC3500298

Free PMC Article

January 14, 2014January 29, 2014

Neuroimaging and mediumship: a promising research line

ABSTRACT

The mind-body relationship has prompted debate from the times of millennial religious traditions and the ancient Greeks through to contemporary neuroscience, and although these questions have yet to be decisively answered, therapeutic interventions today are guided by assumptions made in this respect. Research on the neural correlates of consciousness and mental expressions has made progress over the last 15 years by developing functional brain imaging methods. This approach may open up new perspectives for studies of the expression of presumed instances of spiritual consciousness, which would have major ethical, social and philosophical implications. We pose a promising new line of research in the neurosciences and discuss certain issues pertaining to the effective use of neuroimaging to investigate mediumship and advance the consensus comprehension of consciousness, alleged spiritual communication and its relations with the brain. We highlight methodological challenges and lessons gleaned from our neurofunctional study of mediumship to be considered for further research in this field when formulating hypotheses to address these phenomena, and discuss useful guidelines for neuroimaging studies of spiritual experiences in general.

Keywords: Mediumship, consciousness, dissociation, neuroimaging, SPECT.

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December 6, 2012January 29, 2014

Physiological study of Brazilian mediums

Posted on December 5, 2012 by carlosalvarado

Carlos S. Alvarado, Ph.D., Atlantic University

For years there have been speculations about a variety of processes underlying mediumship. The study reported here is a pioneering effort in the study of the physiology of mediumship through the use of neuroimaging techniques. The authors of the paper investigated the performance of Brazilian automatic writing mediums.

http://carlossalvarado