Stabilizing Circadian Rhythms in Bipolar Disorder by Chaos Control Methods
Bipolar disorder (BD), which involves mood swings between mania and depression, is associated with multiple relapses during long-term treatment and high suicide and morbidity rates. In BD, the circadian rhythms, which are measured by daily mood scores and actigraphic records, are disturbed. Chronoth...
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| Format: | Article |
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Frontiers Media S.A.
2020-10-01
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| Series: | Frontiers in Applied Mathematics and Statistics |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fams.2020.562929/full |
| _version_ | 1819162639695085568 |
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| author | Sou Nobukawa Haruhiko Nishimura Hirotaka Doho Hirotaka Doho Tetsuya Takahashi Tetsuya Takahashi Tetsuya Takahashi |
| author_facet | Sou Nobukawa Haruhiko Nishimura Hirotaka Doho Hirotaka Doho Tetsuya Takahashi Tetsuya Takahashi Tetsuya Takahashi |
| author_sort | Sou Nobukawa |
| collection | DOAJ |
| description | Bipolar disorder (BD), which involves mood swings between mania and depression, is associated with multiple relapses during long-term treatment and high suicide and morbidity rates. In BD, the circadian rhythms, which are measured by daily mood scores and actigraphic records, are disturbed. Chronotherapy has emerged as a potential treatment for BD because it stabilizes the disturbed circadian rhythms and improves BD symptoms. Concrete treatments include light therapy and combination therapy (light therapy and drugs). However, some patients have difficulty adjusting to light therapy; inappropriate light and duration of treatment increase risks for inducing mixed states and the emergence of conditions, such as hypomania and autonomic hyperactivation. Therefore, it is important to devise methods for optimizing chronotherapy for BD. We aimed to develop feedback signals for the frontal cortex, which were based on the delayed feedback method as one of the chaos control methods, to stabilize the disturbed circadian rhythms of BD. Concrete procedures of this study are indicated as follows: first, circadian rhythms of BD are reproduced using the frontal cortex and hypothalamus neural system, which has been previously proposed. Second, the delayed feedback signal is developed by using bifurcation analysis. Third, the effect of delayed feedback signal is evaluated by index for complexity, and power spectrum under the condition with/without stochastic noise in feedback term. We found that application of the delayed feedback signal to the frontal cortical neural activity induces the periodic state of circadian rhythms from the disturbed complex and is feasible for treating BD. However, when increasing the influence of noise in feedback term, the stabilizing effect is diminished. In conclusion, we developed a stabilizing method for disturbed circadian rhythms of BD using the circadian neural systems. The present study highlights the potential usefulness of the chaos control method for treating BD. |
| first_indexed | 2024-12-22T17:31:26Z |
| format | Article |
| id | doaj.art-1aaa460431b049e0bf3ee846c704b60c |
| institution | Directory Open Access Journal |
| issn | 2297-4687 |
| language | English |
| last_indexed | 2024-12-22T17:31:26Z |
| publishDate | 2020-10-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Applied Mathematics and Statistics |
| spelling | doaj.art-1aaa460431b049e0bf3ee846c704b60c2022-12-21T18:18:37ZengFrontiers Media S.A.Frontiers in Applied Mathematics and Statistics2297-46872020-10-01610.3389/fams.2020.562929562929Stabilizing Circadian Rhythms in Bipolar Disorder by Chaos Control MethodsSou Nobukawa0Haruhiko Nishimura1Hirotaka Doho2Hirotaka Doho3Tetsuya Takahashi4Tetsuya Takahashi5Tetsuya Takahashi6Department of Computer Science, Chiba Institute of Technology, Narashino, JapanGraduate School of Applied Informatics, University of Hyogo, Kobe, JapanGraduate School of Applied Informatics, University of Hyogo, Kobe, JapanFaculty of Education, Teacher Training Division, Kochi University, Kochi, JapanResearch Center for Child Mental Development, Kanazawa University, Kanazawa, JapanDepartment of Neuropsychiatry, University of Fukui, Eiheiji, JapanResearch Center for Child Mental Development, Kanazawa University, Kanazawa, JapanBipolar disorder (BD), which involves mood swings between mania and depression, is associated with multiple relapses during long-term treatment and high suicide and morbidity rates. In BD, the circadian rhythms, which are measured by daily mood scores and actigraphic records, are disturbed. Chronotherapy has emerged as a potential treatment for BD because it stabilizes the disturbed circadian rhythms and improves BD symptoms. Concrete treatments include light therapy and combination therapy (light therapy and drugs). However, some patients have difficulty adjusting to light therapy; inappropriate light and duration of treatment increase risks for inducing mixed states and the emergence of conditions, such as hypomania and autonomic hyperactivation. Therefore, it is important to devise methods for optimizing chronotherapy for BD. We aimed to develop feedback signals for the frontal cortex, which were based on the delayed feedback method as one of the chaos control methods, to stabilize the disturbed circadian rhythms of BD. Concrete procedures of this study are indicated as follows: first, circadian rhythms of BD are reproduced using the frontal cortex and hypothalamus neural system, which has been previously proposed. Second, the delayed feedback signal is developed by using bifurcation analysis. Third, the effect of delayed feedback signal is evaluated by index for complexity, and power spectrum under the condition with/without stochastic noise in feedback term. We found that application of the delayed feedback signal to the frontal cortical neural activity induces the periodic state of circadian rhythms from the disturbed complex and is feasible for treating BD. However, when increasing the influence of noise in feedback term, the stabilizing effect is diminished. In conclusion, we developed a stabilizing method for disturbed circadian rhythms of BD using the circadian neural systems. The present study highlights the potential usefulness of the chaos control method for treating BD.https://www.frontiersin.org/article/10.3389/fams.2020.562929/fullbipolar disordercircadian rhythmschaos controldelayed feedback controlchaos–chaos intermittencychronotherapy |
| spellingShingle | Sou Nobukawa Haruhiko Nishimura Hirotaka Doho Hirotaka Doho Tetsuya Takahashi Tetsuya Takahashi Tetsuya Takahashi Stabilizing Circadian Rhythms in Bipolar Disorder by Chaos Control Methods Frontiers in Applied Mathematics and Statistics bipolar disorder circadian rhythms chaos control delayed feedback control chaos–chaos intermittency chronotherapy |
| title | Stabilizing Circadian Rhythms in Bipolar Disorder by Chaos Control Methods |
| title_full | Stabilizing Circadian Rhythms in Bipolar Disorder by Chaos Control Methods |
| title_fullStr | Stabilizing Circadian Rhythms in Bipolar Disorder by Chaos Control Methods |
| title_full_unstemmed | Stabilizing Circadian Rhythms in Bipolar Disorder by Chaos Control Methods |
| title_short | Stabilizing Circadian Rhythms in Bipolar Disorder by Chaos Control Methods |
| title_sort | stabilizing circadian rhythms in bipolar disorder by chaos control methods |
| topic | bipolar disorder circadian rhythms chaos control delayed feedback control chaos–chaos intermittency chronotherapy |
| url | https://www.frontiersin.org/article/10.3389/fams.2020.562929/full |
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