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19Neural Correlates of the Shamanic State of ConsciousnessFrontiers in Human Neuroscience 15 610466. 2021.Psychedelics have been recognized as model interventions for studying altered states of consciousness. However, few empirical studies of the shamanic state of consciousness, which is anecdotally similar to the psychedelic state, exist. We investigated the neural correlates of shamanic trance using high-density electroencephalography (EEG) in 24 shamanic practitioners and 24 healthy controls during rest, shamanic drumming, and classical music listening, followed by an assessment of altered states…Read more
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20Estimating the Integrated Information Measure Phi from High-Density Electroencephalography during States of Consciousness in HumansFrontiers in Human Neuroscience 12. 2018.
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122Protocol for the Reconstructing Consciousness and Cognition StudyFrontiers in Human Neuroscience 11. 2017.
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47Integrating the science of consciousness and anesthesiaAnesthesia and Analgesia 103 975-982. 2006.
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63The temporal organization of functional brain connectivity is abnormal in schizophrenia but does not correlate with symptomatologyConsciousness and Cognition 20 (4): 1050-1054. 2011.Previous work employing graph theory and nonlinear analysis has found increased spatial and temporal disorder, respectively, of functional brain connectivity in schizophrenia. We present a new method combining graph theory and nonlinear techniques that measures the temporal disorder of functional brain connections. Multichannel electroencephalographic data were windowed and functional networks were reconstructed using the minimum spanning trees of correlation matrices. Using a method based on Sh…Read more
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50Normal Brain Response to Propofol in Advance of Recovery from Unresponsive Wakefulness SyndromeFrontiers in Human Neuroscience 10. 2016.
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144Inverse zombies, anesthesia awareness, and the hard problem of unconsciousnessConsciousness and Cognition 17 (4): 1163-1168. 2008.Philosophical (p-) zombies are constructs that possess all of the behavioral features and responses of a sentient human being, yet are not conscious. P-zombies are intimately linked to the hard problem of consciousness and have been invoked as arguments against physicalist approaches. But what if we were to invert the characteristics of p-zombies? Such an inverse (i-) zombie would possess all of the behavioral features and responses of an insensate being yet would nonetheless be conscious. W…Read more
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62Propofol induction reduces the capacity for neural information integration: Implications for the mechanism of consciousness and general anesthesiaConsciousness and Cognition 18 (1): 56-64. 2009.The cognitive unbinding paradigm suggests that the synthesis of neural information is attenuated by general anesthesia. Here, we analyzed the functional organization of brain activities in the conscious and anesthetized states, based on functional segregation and integration. Electroencephalography recordings were obtained from 14 subjects undergoing induction of general anesthesia with propofol. We quantified changes in mean information integration capacity in each band of the EEG. After induct…Read more
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121Schizophrenia, dissociation, and consciousnessConsciousness and Cognition 20 (4): 1042-1049. 2011.Current thinking suggests that dissociation could be a significant comorbid diagnosis in a proportion of schizophrenic patients with a history of trauma. This potentially may explain the term “schizophrenia” in its original definition by Bleuler, as influenced by his clinical experience and personal view. Additionally, recent findings suggest a partial overlap between dissociative symptoms and the positive symptoms of schizophrenia, which could be explained by inhibitory deficits. In this contex…Read more
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Nietzsche's Zarathustra: A New Dimension in Freud's Structural Theory of MindPhilosophy Pathways 63. 2003.
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54The directionality and functional organization of frontoparietal connectivity during consciousness and anesthesia in humansConsciousness and Cognition 18 (4): 1069-1078. 2009.Frontoparietal connectivity has been suggested to be important in conscious processing and its interruption is thought to be one mechanism of general anesthesia. Data in animals demonstrate that feedforward processing of information may persist during the anesthetized state, while feedback processing is inhibited. We investigated the directionality and functional organization of frontoparietal connectivity in 10 human subjects anesthetized with propofol on two separate occasions. Multichannel el…Read more
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83Subcortical consciousness: Implications for fetal anesthesia and analgesiaBehavioral and Brain Sciences 30 (1): 86-87. 2007.In this commentary we discuss the possibility of subcortical consciousness and its implications for fetal anesthesia and analgesia. We review the neural development of structural and functional elements that may participate in conscious representation, with a particular focus on the experience of pain. (Published Online May 1 2007).
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16Toward a General Theory of Unconscious Processes in Psychoanalysis and AnesthesiologyJournal of the American Psychoanalytic Association 56 (1): 203-222. 2008.
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University of Michigan, Ann ArborRegular Faculty
Ann Arbor, Michigan, United States of America
Areas of Interest
Natural Sciences |
Cognitive Sciences |
Professional Areas |