Brain complexities and anesthesia: Their meaning and measurement
A complex system is often associated with emergence of new phenomena from the interactions between the system’s components. General anesthesia reduces brain complexity and so inhibits the emergence of consciousness. An understanding of complexity is necessary for the interpretation of brain monitori...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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Wolters Kluwer Health
2022
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| _version_ | 1826310491580923904 |
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| author | Li, D Fabus, MS Sleigh, JW |
| author_facet | Li, D Fabus, MS Sleigh, JW |
| author_sort | Li, D |
| collection | OXFORD |
| description | A complex system is often associated with emergence of new phenomena from the interactions between the system’s components. General anesthesia reduces brain complexity and so inhibits the emergence of consciousness. An understanding of complexity is necessary for the interpretation of brain monitoring algorithms. Complexity indices capture the “difficulty” of understanding brain activity over time and/or space. Complexity–entropy plots reveal the types of complexity indices and their balance of randomness and structure. Lempel–Ziv complexity is a common index of temporal complexity for single-channel electroencephalogram containing both power spectral and nonlinear effects, revealed by phase-randomized surrogate data. Computing spatial complexities involves forming a connectivity matrix and calculating the complexity of connectivity patterns. Spatiotemporal complexity can be estimated in multiple ways including temporal or spatial concatenation, estimation of state switching, or integrated information. This article illustrates the concept and application of various complexities by providing working examples; a website with interactive demonstrations has also been created. |
| first_indexed | 2024-03-07T07:52:48Z |
| format | Journal article |
| id | oxford-uuid:4b1ef1b3-00d9-4849-927b-dcdbae73a2b6 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:52:48Z |
| publishDate | 2022 |
| publisher | Wolters Kluwer Health |
| record_format | dspace |
| spelling | oxford-uuid:4b1ef1b3-00d9-4849-927b-dcdbae73a2b62023-08-04T08:47:51ZBrain complexities and anesthesia: Their meaning and measurementJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:4b1ef1b3-00d9-4849-927b-dcdbae73a2b6EnglishSymplectic ElementsWolters Kluwer Health2022Li, DFabus, MSSleigh, JWA complex system is often associated with emergence of new phenomena from the interactions between the system’s components. General anesthesia reduces brain complexity and so inhibits the emergence of consciousness. An understanding of complexity is necessary for the interpretation of brain monitoring algorithms. Complexity indices capture the “difficulty” of understanding brain activity over time and/or space. Complexity–entropy plots reveal the types of complexity indices and their balance of randomness and structure. Lempel–Ziv complexity is a common index of temporal complexity for single-channel electroencephalogram containing both power spectral and nonlinear effects, revealed by phase-randomized surrogate data. Computing spatial complexities involves forming a connectivity matrix and calculating the complexity of connectivity patterns. Spatiotemporal complexity can be estimated in multiple ways including temporal or spatial concatenation, estimation of state switching, or integrated information. This article illustrates the concept and application of various complexities by providing working examples; a website with interactive demonstrations has also been created. |
| spellingShingle | Li, D Fabus, MS Sleigh, JW Brain complexities and anesthesia: Their meaning and measurement |
| title | Brain complexities and anesthesia: Their meaning and measurement |
| title_full | Brain complexities and anesthesia: Their meaning and measurement |
| title_fullStr | Brain complexities and anesthesia: Their meaning and measurement |
| title_full_unstemmed | Brain complexities and anesthesia: Their meaning and measurement |
| title_short | Brain complexities and anesthesia: Their meaning and measurement |
| title_sort | brain complexities and anesthesia their meaning and measurement |
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