Relative right temporal-lobe theta activity correlates with Vingiano's hemispheric quotient and the "sensed presence"

Methodological guidelines to investigate altered states of consciousness and anomalous experiences

Anomalous experiences (AE) (uncommon experiences or one that is believed to deviate from the usually accepted explanations of reality: hallucinations, synesthesia, experiences interpreted as telepathic…) and altered states of consciousness (ASC) have been described in all societies of all ages. Even so, scientists have long neglected the studies on this theme. To study AE and ASC is not necessary to share the beliefs we explore, they can be investigated as subjective experiences and correlated with other data, like any other human experience. This article presents some methodological guidelines to investigate these experiences, among them: to avoid dogmatic prejudice and to 'pathologize' the unusual; the value of a theory and a comprehensive literature review; to utilize a variety of criteria for pathology and normality; the investigation of clinical and non-clinical populations; development of new appropriate research instruments; to be careful to choose the wording to describe the AE; to distinguished the lived experience from its interpretations; to take into account the role of culture; to evaluate the validity and reliability of reports and, last but not least, creativity and diversity in choosing methods.

Enhanced incidence of "the sensed presence" in people who have learned to meditate: support for the right hemispheric intrusion hypothesis

If the "sensed presence" is the transient intrusion of the right hemispheric equivalent of the left hemispheric (and highly linguistic) sense of self, then any process that facilitates interhemispheric electrical coherence should enhance these experiences. As predicted, the "ego-alien intrusion" (sensed presence) factor was specifically and significantly elevated in 221 people who had learned to meditate (65 to 70% were involved in Transcendental Meditation) compared to 860 nonmeditators. Variants of a sensed presence were more frequent in female than in male meditators and were particularly evident in left-handers who had learned to mediate. The effect size suggests that learning a meditation technique is counterindicated for subpopulations, such as borderline, schizotypal, or dissociative personalities, who display very fragile self-concepts.

Experimental stimulation by burst-firing weak magnetic fields over the right temporal lobe may facilitate apprehension in women

Intermittent bursts of weak magnetic fields whose patterns simulate normal amygdaloidal-hippocampal activity were generated by computer over the right or left temporal regions of men and women during partial sensory deprivation. As predicted, women but not men reported greater apprehension during right-hemispheric but not left-hemispheric stimulation. Intrusions of right-hemispheric processes have been hypothesized to affect self-esteem adversely. These results also support the role of the right parahippocampal region in the production of panic attacks.