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Measures of differentiation and integration: One step closer to consciousness

Published online by Cambridge University Press:  23 March 2022

Marcello Massimini
Affiliation:
Department of Biomedical and Clinical Sciences “L. Sacco”, University of Milan, 20157Milan, [email protected]://www.unimi.it/en/ugov/person/[email protected]://www.unimi.it/en/ugov/person/[email protected]://www.unimi.it/en/ugov/person/mario-rosanova IRCCS Fondazione Don Carlo Gnocchi ONLUS, 20122Milan, [email protected]://www.unimi.it/en/ugov/person/silvia-casarotto Canadian Institute for Advanced Research (CIFAR), Toronto, ONM5G 1M1, Canada.
Simone Sarasso
Affiliation:
Department of Biomedical and Clinical Sciences “L. Sacco”, University of Milan, 20157Milan, [email protected]://www.unimi.it/en/ugov/person/[email protected]://www.unimi.it/en/ugov/person/[email protected]://www.unimi.it/en/ugov/person/mario-rosanova
Silvia Casarotto
Affiliation:
Department of Biomedical and Clinical Sciences “L. Sacco”, University of Milan, 20157Milan, [email protected]://www.unimi.it/en/ugov/person/[email protected]://www.unimi.it/en/ugov/person/[email protected]://www.unimi.it/en/ugov/person/mario-rosanova IRCCS Fondazione Don Carlo Gnocchi ONLUS, 20122Milan, [email protected]://www.unimi.it/en/ugov/person/silvia-casarotto
Mario Rosanova
Affiliation:
Department of Biomedical and Clinical Sciences “L. Sacco”, University of Milan, 20157Milan, [email protected]://www.unimi.it/en/ugov/person/[email protected]://www.unimi.it/en/ugov/person/[email protected]://www.unimi.it/en/ugov/person/mario-rosanova

Abstract

Interpreting empirical measures of integration and differentiation as indices of cortical performance and memory consolidation during wakefulness rather than consciousness per se is inconsistent with the literature. Recent studies show that these theory-inspired measures can dissociate from such processes and reliably index the brain's capacity for experience. We consider this as a positive trend in consciousness research.

Type
Open Peer Commentary
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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References

Aubinet, C., Murphy, L., Bahri, M. A., Larroque, S. K., Cassol, H., Annen, J., … Gosseries, O. (2018). Brain, behavior, and cognitive interplay in disorders of consciousness: A multiple case study. Frontiers in Neurology 9, 665. doi: 10.3389/fneur.2018.00665CrossRefGoogle ScholarPubMed
Bai, Y., Lin, Y., & Ziemann, U. (2020). Managing disorders of consciousness: The role of electroencephalography. Journal of Neurology, 268, 40334065. https://doi.org/10.1007/s00415-020-10095-zCrossRefGoogle ScholarPubMed
Bayne, T., Seth, A. K., & Massimini, M. (2020). Are there islands of awareness? Trends in Neurosciences 43(1), 616. doi: 10.1016/j.tins.2019.11.003CrossRefGoogle ScholarPubMed
Bodien, Y. G., Martens, G., Ostrow, J., Sheau, K., & Giacino, J. T. (2020). Cognitive impairment, clinical symptoms and functional disability in patients emerging from the minimally conscious state. NeuroRehabilitation 46(1), 6574. doi: 10.3233/NRE-192860CrossRefGoogle ScholarPubMed
Casali, A. G., Gosseries, O., Rosanova, M., Boly, M., Sarasso, S., Casali, K. R., … Massimini, M. (2013). A theoretically based Index of consciousness independent of sensory processing and behavior. Science Translational Medicine 5(198), 198ra105198ra105. doi: 10.1126/scitranslmed.3006294CrossRefGoogle ScholarPubMed
Casarotto, S., Comanducci, A., Rosanova, M., Sarasso, S., Fecchio, M., Napolitani, M., … Massimini, M. (2016). Stratification of unresponsive patients by an independently validated index of brain complexity. Annals of Neurology 80(5), 718729. doi: 10.1002/ana.24779CrossRefGoogle ScholarPubMed
Comanducci, A., Boly, M., Claassen, J., De Lucia, M., Gibson, R. M., Juan, E., … Massimini, M. (2020). Clinical and advanced neurophysiology in the prognostic and diagnostic evaluation of disorders of consciousness: Review of an IFCN-endorsed expert group. Clinical Neurophysiology 131(11), 27362765. doi: 10.1016/j.clinph.2020.07.015CrossRefGoogle ScholarPubMed
Comolatti, R., Pigorini, A., Casarotto, S., Fecchio, M., Faria, G., Sarasso, S., … Casali, A. G. (2019). A fast and general method to empirically estimate the complexity of brain responses to transcranial and intracranial stimulations. Brain Stimulation 12(5), 12801289. doi: 10.1016/j.brs.2019.05.013CrossRefGoogle ScholarPubMed
Cousins, J. N., El-Deredy, W., Parkes, L. M., Hennies, N., & Lewis, P. A. (2014). Cued memory reactivation during slow-wave sleep promotes explicit knowledge of a motor sequence. Journal of Neuroscience 34(48), 1587015876. doi: 10.1523/JNEUROSCI.1011-14.2014CrossRefGoogle ScholarPubMed
Esposito, M. J., Nielsen, T. A., & Paquette, T. (2004). Reduced alpha power associated with the recall of mentation from stage 2 and stage REM sleep. Psychophysiology 41(2), 288297. https://doi.org/10.1111/j.1469-8986.00143.xCrossRefGoogle ScholarPubMed
Frankland, P. W., & Bontempi, B. (2005). The organization of recent and remote memories. Nature Reviews Neuroscience 6(2), 119130. doi: 10.1038/nrn1607CrossRefGoogle ScholarPubMed
Frohlich, J., Toker, D., & Monti, M. M. (2021). Consciousness among delta waves: A paradox? Brain, 144(8), 22572277. https://doi.org/10.1093/brain/awab095CrossRefGoogle ScholarPubMed
Giacino, J. T., Ashwal, S., Childs, N., Cranford, R., Jennett, B., Katz, D. I., … Zasler, N. D. (2002). The minimally conscious state: Definition and diagnostic criteria. Neurology 58(3), 349353. doi: 10.1212/WNL.58.3.349CrossRefGoogle ScholarPubMed
Laventure, S., Fogel, S., Lungu, O., Albouy, G., Sévigny-Dupont, P., Vien, C., … Doyon, J. (2016). NREM2 and sleep spindles are instrumental to the consolidation of motor sequence memories. PLoS Biology 14(3), e1002429. doi: 10.1371/journal.pbio.1002429CrossRefGoogle Scholar
Marshall, L., Helgadóttir, H., Mölle, M., & Born, J. (2006). Boosting slow oscillations during sleep potentiates memory. Nature 444(7119), 610613. doi: 10.1038/nature05278CrossRefGoogle ScholarPubMed
Massimini, M., Ferrarelli, F., Murphy, M. J., Huber, R., Riedner, B. A., Casarotto, S., & Tononi, G. (2010). Cortical reactivity and effective connectivity during REM sleep in humans. Cognitive Neuroscience 1(3), 176183. doi: 10.1080/17588921003731578CrossRefGoogle ScholarPubMed
Merker, B. (2004). Cortex, countercurrent context, and dimensional integration of lifetime memory. Cortex 40(3), 559576. doi: 10.1016/S0010-9452(08)70148-5CrossRefGoogle ScholarPubMed
Rasch, B., & Born, J. (2013). About sleep's role in memory. Physiological Reviews 93(2), 681766. doi: 10.1152/physrev.00032.2012CrossRefGoogle ScholarPubMed
Rasch, B., Büchel, C., Gais, S., & Born, J. (2007). Odor cues during slow-wave sleep prompt declarative memory consolidation. Science (New York, N.Y.) 315(5817), 14261429. doi: 10.1126/science.1138581CrossRefGoogle ScholarPubMed
Rasch, B., Pommer, J., Diekelmann, S., & Born, J. (2009). Pharmacological REM sleep suppression paradoxically improves rather than impairs skill memory. Nature Neuroscience 12(4), 396397. doi: 10.1038/nn.2206CrossRefGoogle ScholarPubMed
Rosanova, M., Fecchio, M., Casarotto, S., Sarasso, S., Casali, A. G., Pigorini, A., … Massimini, M. (2018). Sleep-like cortical OFF-periods disrupt causality and complexity in the brain of unresponsive wakefulness syndrome patients. Nature Communications 9(1), 4427. doi: 10.1038/s41467-018-06871-1CrossRefGoogle ScholarPubMed
Sarasso, S., Boly, M., Napolitani, M., Gosseries, O., Charland-Verville, V., Casarotto, S., … Massimini, M. (2015). Consciousness and complexity during unresponsiveness induced by propofol, xenon, and ketamine. Current Biology 25(23), 30993105. doi: 10.1016/j.cub.2015.10.014CrossRefGoogle ScholarPubMed
Sarasso, S., Casali, A. G., Casarotto, S., Rosanova, M., Sinigaglia, C., & Massimini, M. (2021). Consciousness and complexity: A consilience of evidence. Neuroscience of Consciousness, niab023. https://doi.org/10.1093/nc/niab023Google Scholar
Schönauer, M., Geisler, T., & Gais, S. (2014). Strengthening procedural memories by reactivation in sleep. Journal of Cognitive Neuroscience 26(1), 143153. doi: 10.1162/jocn_a_00471CrossRefGoogle ScholarPubMed
Sergent, C., Corazzol, M., Labouret, G., Stockart, F., Wexler, M., King, J.-R., … Pressnitzer, D. (2021). Bifurcation in brain dynamics reveals a signature of conscious processing independent of report. Nature Communications 12(1), 1149. doi: 10.1038/s41467-021-21393-zCrossRefGoogle ScholarPubMed
Sinitsyn, D. O., Poydasheva, A. G., Bakulin, I. S., Legostaeva, L. A., Iazeva, E. G., Sergeev, D. V., … Piradov, M. A. (2020). Detecting the potential for consciousness in unresponsive patients using the perturbational complexity index. Brain Sciences 10(12), 917. doi: 10.3390/brainsci10120917CrossRefGoogle ScholarPubMed
Westmoreland, B. F., Klass, D. W., Sharbrough, F. W., & Reagan, T. J. (1975). Alpha-coma: Electroencephalographic, clinical, pathologic, and etiologic correlations. Archives of Neurology 32(11), 713718. doi: 10.1001/archneur.1975.00490530035001CrossRefGoogle ScholarPubMed