Psychobiology of altered states of consciousness

The article reviews the current knowledge regarding altered states of consciousness (ASC) (a) occurring spontaneously, (b) evoked by physical and physiological stimulation, (c) induced by psychological means, and (d) caused by diseases. The emphasis is laid on psychological and neurobiological approaches. The phenomenological analysis of the multiple ASC resulted in 4 dimensions by which they can be characterized: activation, awareness span, self-awareness, and sensory dynamics. The neurophysiological approach revealed that the different states of consciousness are mainly brought about by a compromised brain structure, transient changes in brain dynamics (disconnectivity), and neurochemical and metabolic processes. Besides these severe alterations, environmental stimuli, mental practices, and techniques of self-control can also temporarily alter brain functioning and conscious experience.     

Functional neuroanatomy of altered states of consciousness: the transient hypofrontality hypothesis

It is the central hypothesis of this paper that the mental states commonly referred to as altered states of consciousness are principally due to transient prefrontal cortex deregulation. Supportive evidence from psychological and neuroscientific studies of dreaming, endurance running, meditation, daydreaming, hypnosis, and various drug-induced states is presented and integrated. It is proposed that transient hypofrontality is the unifying feature of all altered states and that the phenomenological uniqueness of each state is the result of the differential viability of various frontal circuits. Using an evolutionary approach, consciousness is conceptualized as hierarchically ordered cognitive function. Higher-order structures perform increasingly integrative functions and thus contribute more sophisticated content. Although this implies a holistic approach to consciousness, such a functional hierarchy localizes the most sophisticated layers of consciousness in the zenithal higher-order structure: the prefrontal cortex. The hallmark of altered states of consciousness is the subtle modification of behavioral and cognitive functions that are typically ascribed to the prefrontal cortex. The theoretical framework presented yields a number of testable hypotheses.     

Glossolalia and altered states of consciousness in two New Zealand religious movements

This article examines the prevalence of altered states of consciousness among Christian tongue speakers and compares it to experiences of glossolalia among meditators in a yoga‐based purificatory group called the Golden Light. The article is based on close interaction and interviews with participants over an eight‐year period. The results showed that, by self‐report, most Pentecostals and Charismatics did not experience altered states except during the baptism of the Spirit and that those who did constructed a meaning for their glossolalia. In contrast, all of the meditators described frequent intense altered states, of which speaking in tongues was an occasional manifestation. I suggest that there are two types of glossolalia—spontaneous glossolalia and context‐dependent glossolalia—and that the former is more likely to occur in groups that are radical, experiential, and charismatically led.     

Altered states of consciousness

This commentary dwells on the intellectual, methodological, and stylistic characteristics that constitute the novelty of Robert Yelle's approach to the semiotics of religion. While praising Yelle's refreshing approach and his ability to combine a semiotic mindset with accurate comparative perspective, deep contextual knowledge, and historical sensibility, the commentary raises the issue of the extent to which semioticians can, and should, acknowledge the transient, historical nature of their point of view. This acknowledgment, it is argued, does not necessarily result in a self-deconstruction of the semiotic method itself but in the somewhat paradoxical awareness of the semiotic ideology underpinning it.     

Brain mechanisms of altered consciousness in generalised seizures

In spite of the inherent difficulties in achieving a biologically meaningful definition of consciousness, recent neurophysiological studies are starting to provide some insight in fundamental mechanisms associated with impaired consciousness in neurological disorders. Generalised seizures are associated with disruption of the default state network, a functional network of discrete brain areas, which include the fronto-parietal cortices. Subcortical contribution through activation of thalamocortical structures, as well as striate nuclei are also crucial to produce impaired consciousness in generalised seizures.     

Brain mechanisms of altered consciousness in focal seizures

Consciousness is a central concept in epileptology, relevant to the understanding of both focal and generalized seizures. Within focal seizures, impairment of consciousness has long been considered as the main criterion differentiating complex partial seizures (CPS) from simple partial seizures With the development of improved tools for investigating human brain function, new insights into the brain mechanisms of altered consciousness in CPS have become available. This paper reviews the existing literature on how the currently available methods can be used to address the fundamental issue of how CPS alter consciousness.     

催眠和变更意识状态的探索与思考

如今一般大众,甚至许多心理学专业人员都把催眠状态下的意识和各种变更的意识状态统称为潜意识状态,这种提法存在着很大弊端。本文举实例论述了单就催眠状态来说也有不相同的表现利性质;同时阐述了研究具体的各种变更意识状态的表现、性质、特点及分类的重要性。     

The experience of altered states of consciousness in shamanic ritual: The role of pre-existing beliefs and affective factors

Much attention has been paid recently to the role of anomalous experiences in the aetiology of certain types of psychopathology, e.g. in the formation of delusions. We examine, instead, the top-down influence of pre-existing beliefs and affective factors in shaping an individual’s characterisation of anomalous sensory experiences. Specifically we investigated the effects of paranormal beliefs and alexithymia in determining the intensity and quality of an altered state of consciousness (ASC). Fifty five participants took part in a sweat lodge ceremony, a traditional shamanic ritual which was unfamiliar to them. Participants reported significant alterations in their state of consciousness, quantified using the ‘APZ’ questionnaire, a standardized measure of ASC experience. Participants endorsing paranormal beliefs compatible with shamanic mythology, and those showing difficulty identifying feelings scored higher on positive dimensions of ASC experience. Our findings demonstrate that variation in an individual’s characterisation of anomalous experiences is nuanced by pre-existing beliefs and affective factors.     

The default mode network and altered consciousness in epilepsy

The default mode network has been hypothesized based on the observation that specific regions of the brain are consistently activated during the resting state and deactivated during engagement with task. The primary nodes of this network, which typically include the precuneus/posterior cingulate, the medial frontal and lateral parietal cortices, are thought to be involved in introspective and social cognitive functions. Interestingly, this same network has been shown to be selectively impaired during epileptic seizures associated with loss of consciousness. Using a wide range of neuroimaging and electrophysiological modalities, decreased activity in the default mode network has been confirmed during complex partial, generalized tonic-clonic, and absence seizures. In this review we will discuss these three seizure types and will focus on possible mechanisms by which decreased default mode network activity occurs. Although the specific mechanisms of onset and propagation differ considerably across these seizure types, we propose that the resulting loss of consciousness in all three types of seizures is due to active inhibition of subcortical arousal systems that normally maintain default mode network activity in the awake state. Further, we suggest that these findings support a general "network inhibition hypothesis", by which active inhibition of arousal systems by seizures in certain cortical regions leads to cortical deactivation in other cortical areas. This may represent a push-pull mechanism similar to that seen operating between cortical networks under normal conditions.     

Phenomenality,conscious states,and consciousness inessentialism

I draw attention to an ambiguity of the expression ‘phenomenal consciousness’ that is an avoidable yet persistent source of conceptual confusio     

Altered states of consciousness are related to higher sexual responsiveness

Altered states of consciousness lead to profound changes in the sense of self, time and space. We assessed how these changes were related to sexual responsiveness during sex. 116 subjects reported (a) intensity of awareness concerning body, space and time, and (b) satisfaction, desire, arousal, and orgasm occurrence. We differentiated vaginal intercourse orgasm from noncoital orgasm. Female vaginal intercourse orgasm was further differentiated as with or without concurrent clitoral masturbation. Overall, sexual responsiveness was related to greater body awareness and lesser time and space awareness. Satisfaction, desire, and arousal were especially associated with less time awareness in women. Female orgasms during vaginal intercourse were related to greater body awareness and lesser time awareness, but noncoital orgasms were unrelated. Our findings provide empirical support for the hypotheses that altered states of consciousness with attentional absorption are strongly related to sexual responsiveness in women, and to a lesser extent in men.     

Altered states of consciousness, dissociation, and dream recall

In a sample of 71 medical students, dream recall frequency was positively correlated with proneness to altered states of consciousness (r = .26) measured by the State of Mind and Consciousness Questionnaire and dissociation (r = .29) measured by the Dissociative Experiences Scale II. A regression analysis, however, yielded neither altered states of consciousness nor dissociation, sex, or age to be significant predictors of dream recall frequency. Among women dream recall frequency was associated with proneness to dissociation; among men it was correlated with proneness to altered states of consciousness.     

Dyadically expanded states of consciousness and the process of therapeutic change

This paper addresses an intersubjective issue that arises out of our model of therapeutic change: Why do humans so strongly seek states of emotional connectedness and intersubjectivity and why does the failure to achieve connectedness have such a damaging effect on the mental health of the infant? A hypothesis is offered—the Dyadic Expansion of Consciousness Hypothesis—as an attempt to explain these phenomena. This hypothesis is based on the Mutual Regulation Model (MRM) of infant–adult interaction. The MRM describes the microregulatory social-emotional process of communication that generates (or fails to generate) dyadic intersubjective states of shared consciousness. In particular, the Dyadic Consciousness hypothesis argues that each individual, in one case the infant and mother or in another the patient and the therapist, is a self-organizing system that creates his or her own states of consciousness (states of brain organization), which can be expanded into more coherent and complex states in collaboration with another self-organizing system. Critically understanding how the mutual regulation of affect functions to create dyadic states of consciousness also can help us understand what produces change in the therapeutic process. © 1998 Michigan Association for Infant Mental Health