Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 110, Issue -, Pages 10357-10364Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1301188110
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Funding
- National Institutes of Health [1R01 GM098578]
- James S. McDonnell Foundation
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Are animals conscious? If so, when did consciousness evolve? We address these long-standing and essential questions using a modern neuroscientific approach that draws on diverse fields such as consciousness studies, evolutionary neurobiology, animal psychology, and anesthesiology. We propose that the stepwise emergence from general anesthesia can serve as a reproducible model to study the evolution of consciousness across various species and use current data from anesthesiology to shed light on the phylogeny of consciousness. Ultimately, we conclude that the neurobiological structure of the vertebrate central nervous system is evolutionarily ancient and highly conserved across species and that the basic neurophysiologic mechanisms supporting consciousness in humans are found at the earliest points of vertebrate brain evolution. Thus, in agreement with Darwin's insight and the recent Cambridge Declaration on Consciousness in Non-Human Animals, a review of modern scientific data suggests that the differences between species in terms of the ability to experience the world is one of degree and not kind.
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