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Zohdi H, Märki J, Scholkmann F, Wolf U. Cerebral, systemic physiological and behavioral responses to colored light exposure during a cognitive task: A SPA-fNIRS study. Behav Brain Res 2024; 462:114884. [PMID: 38296201 DOI: 10.1016/j.bbr.2024.114884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 01/25/2024] [Accepted: 01/26/2024] [Indexed: 02/10/2024]
Abstract
Colored light has important implications for human health and well-being, as well as for the aesthetics and function of various environments. In addition to its effects on visual function, colored light has significant effects on cognitive performance, behavior and systemic physiology. The aim of the current study was to comprehensively investigate how colored light exposure (CLE) combined with a cognitive task (2-back) affects performance, cerebral hemodynamics, oxygenation, and systemic physiology as assessed by systemic physiology augmented functional near-infrared spectroscopy (SPA-fNIRS). 36 healthy subjects (22 female, 14 male, age 26.3 ± 5.7 years) were measured twice on two different days. They were exposed to the sequence of blue and red light or vice versa in a randomized crossover design. During the CLE, the subjects were asked to perform a 2-back task. The 2-back task performance was correlated with changes in the concentration of oxygenated hemoglobin in the prefrontal cortex (red: r = -0.37, p = 0.001; blue: r = -0.33, p = 0.004) and the high-frequency component of the heart rate variability (red: r = 0.35, p = 0.003; blue: r = 0.25, p = 0.04). These changes were independent of the CLE. Sequence-dependent effects were observed for fNIRS signals at the visual cortex (VC) and for electrodermal activity (EDA). While both colors caused relatively similar changes in the VC and EDA at the position of the first exposure, blue and red light caused greater changes in the VC and EDA, respectively, in the second exposure. There was no significant difference in the subjects' 2-back task performance between the CLE (p = 0.46). The results of this study provide new insights into how human physiology and behavior respond to colored light exposure. Our findings are important for understanding the impact of colored light in our daily lives and its potential applications in a variety of settings, including education, the workplace and healthcare.
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Affiliation(s)
- Hamoon Zohdi
- Institute of Complementary and Integrative Medicine, University of Bern, 3012 Bern, Switzerland; Biomedical Optics Research Laboratory, Department of Neonatology, University Hospital Zurich, University of Zurich, 8091 Zurich, Switzerland.
| | - Josefa Märki
- Institute of Complementary and Integrative Medicine, University of Bern, 3012 Bern, Switzerland
| | - Felix Scholkmann
- Institute of Complementary and Integrative Medicine, University of Bern, 3012 Bern, Switzerland; Biomedical Optics Research Laboratory, Department of Neonatology, University Hospital Zurich, University of Zurich, 8091 Zurich, Switzerland
| | - Ursula Wolf
- Institute of Complementary and Integrative Medicine, University of Bern, 3012 Bern, Switzerland
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Zohdi H, Amez-Droz V, Scholkmann F, Wolf U. Differences Between Good, Moderate and Poor Performers of a Verbal Fluency Task under Blue Light Exposure: An SPA-fNIRS Study. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1438:69-74. [PMID: 37845442 DOI: 10.1007/978-3-031-42003-0_12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2023]
Abstract
Individuals have different performance levels for cognitive tasks. Are these performance levels reflected in physiological parameters? The aim of this study was to address this question by systemic physiology augmented functional near-infrared spectroscopy (SPA-fNIRS). We aimed to investigate whether different verbal fluency task (VFT) performances under blue light exposure were associated with different changes in cerebrovascular oxygenation and systemic physiological activity. The VFT performance of 32 healthy subjects (17 female, 15 male, age: 25.5 ± 4.3 years) was investigated under blue light exposure (120 lux). The VFT, which contained letter and category fluency tasks, lasted 9 min. There were rest periods without light exposure before and after the VFT for 8 min and 15 min, respectively. Based on their number of correct responses, subjects were classified into three groups, i.e., good, moderate, and poor performers. During the entire experiment, we simultaneously measured changes in cerebral and systemic physiological parameters using the SPA-fNIRS approach. We found that the better the subject's performance was, the smaller the task-evoked changes in cerebrovascular hemodynamics and oxygenation in the prefrontal cortex. Performance-dependent changes were also evident for skin conductance, arterial oxygen saturation and mean arterial pressure. This is the first VFT study that applies the comprehensive SPA-fNIRS approach to determine the relationship between task performance and changes in cerebral oxygenation and systemic physiology. Our study shows that these parameters are indeed related and the performance is reflected in the task-evoked cerebrovascular and systemic physiological changes.
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Affiliation(s)
- Hamoon Zohdi
- Institute of Complementary and Integrative Medicine, University of Bern, Bern, Switzerland.
- Biomedical Optics Research Laboratory, Department of Neonatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.
| | - Vanessa Amez-Droz
- Institute of Complementary and Integrative Medicine, University of Bern, Bern, Switzerland
| | - Felix Scholkmann
- Institute of Complementary and Integrative Medicine, University of Bern, Bern, Switzerland
- Biomedical Optics Research Laboratory, Department of Neonatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Ursula Wolf
- Institute of Complementary and Integrative Medicine, University of Bern, Bern, Switzerland
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Scholkmann F, Zohdi H, Wolf M, Wolf U. Infradian Rhythms in Cerebrovascular Oxygenation and Blood Volume in Humans at Rest: A 5-Year Study. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1438:37-44. [PMID: 37845437 DOI: 10.1007/978-3-031-42003-0_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2023]
Abstract
BACKGROUND All parameters of human physiology show chronobiological variability. While circadian (cycle length ~ 24 h) rhythms of the neuronal, hemodynamic and metabolic aspects of human brain activity are increasingly being explored, infradian (cycle length > 24 h) rhythms are largely unexplored. AIM We investigated if cerebrovascular oxygen saturation (StO2) and blood volume ([tHb]) values measured over many years in many subjects during resting show infradian rhythmicity. SUBJECTS AND METHODS Absolute StO2 and [tHb] values (median over a 5 min resting-phase while sitting) were measured in 220 healthy subjects (age: 24.7 ± 3.6 years, 87 males, 133 females) 2-4 times on different days over the right and left frontal lobe (FL) and occipital lobe (OL) by employing frequency-domain NIRS as part of different systemic physiology augmented functional near-infrared spectroscopy, SPA-fNIRS, studies. The data set consisted of 708 single measurements performed over a timespan of 5 years (2017-2021). General additive models (GAM) and cosinor modelling were used to analyze the data. RESULTS The GAM analysis revealed (i) a non-linear trend in the StO2 and [tHb] values over the 5-year span, (ii) a circannual (cycle length ~ 12 months) rhythm in StO2 at the FL (amplitude (A): 3.4%, acrophase (φ): June) and OL (A: 1.5%, φ: May) as well as in [tHb] at the OL (A: 1.2 μM, bathyphase (θ): June), and (iii) a circasemiannual (cycle length ~ 6 months) rhythm in [tHb] at the FL (A: 2.7 μM, φ: March and September, respectively). Furthermore, the circannual oscillations of StO2 (at the FL) and [tHb] (at the OL) were statistically significantly correlated with the day length, outdoor temperature, humidity and air pressure. DISCUSSION AND CONCLUSION We conclude that absolute values of StO2 and [tHb] show chronobiological variability on the group-level with a long-term nonlinear trend as well as circannual/circasemiannual rhythmicity. These rhythms need to be taken into account when defining reference values for StO2 and [tHb] and may correlate with the variability of cerebrovascular disease incidents over the year.
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Affiliation(s)
- Felix Scholkmann
- Institute of Complementary and Integrative Medicine, University of Bern, Bern, Switzerland.
- Biomedical Optics Research Laboratory, Department of Neonatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.
| | - Hamoon Zohdi
- Institute of Complementary and Integrative Medicine, University of Bern, Bern, Switzerland
- Biomedical Optics Research Laboratory, Department of Neonatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Martin Wolf
- Biomedical Optics Research Laboratory, Department of Neonatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Ursula Wolf
- Institute of Complementary and Integrative Medicine, University of Bern, Bern, Switzerland
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Kim YH, Kim Y, Yoon J, Cho YS, Kym D, Hur J, Chun W, Kim BJ. Frontal lobe hemodynamics detected by functional near-infrared spectroscopy during head-up tilt table tests in patients with electrical burns. Front Hum Neurosci 2022; 16:986230. [PMID: 36158619 PMCID: PMC9493373 DOI: 10.3389/fnhum.2022.986230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Accepted: 08/11/2022] [Indexed: 11/13/2022] Open
Abstract
Significance Electrical burns can cause severe damage to the nervous system, resulting in autonomic dysfunction with reduced cerebral perfusion. However, few studies have investigated these consequences. Aim To elucidate changes in prefrontal cerebral hemodynamics using functional near-infrared spectroscopy (fNIRS) during the head-up tilt table test (HUT) for patients with electrical burns. Approach We recruited 17 patients with acute electrical burns within 1 week after their accidents and 10 healthy volunteers. The NIRS parameters acquired using an fNIRS device attached to the forehead were analyzed in five distinct HUT phases. Results Based on their HUT response patterns, patients with electrical burns were classified into the group with abnormal HUT results (APG, n = 4) or normal HUT results (NPG, n = 13) and compared with the healthy control (HC, n = 10) participants. We found trends in hemodynamic changes during the HUT that distinguished HC, NPG, and APG. Reduced cerebral perfusion and decreased blood oxygenation during the HUT were found in both the NPG and APG groups. Patients with electrical burns had autonomic dysfunction compared to the HC participants. Conclusions Using fNIRS, we observed that acute-stage electrical burn injuries could affect cerebral perfusion.
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Affiliation(s)
- Yoo Hwan Kim
- Department of Neurology, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, South Korea
- Department of Neurology, Graduate School, Korea University, Seoul, South Korea
| | - Youngmin Kim
- Department of Surgery, Burn and Trauma Center, Daein Surgery and Medical Hospital, Seongnam, South Korea
| | - Jaechul Yoon
- Department of Surgery, Hangang Sacred Heart Hospital, Hallym University College of Medicine, Seoul, South Korea
| | - Yong Suk Cho
- Department of Surgery, Hangang Sacred Heart Hospital, Hallym University College of Medicine, Seoul, South Korea
| | - Dohern Kym
- Department of Surgery, Hangang Sacred Heart Hospital, Hallym University College of Medicine, Seoul, South Korea
| | - Jun Hur
- Department of Surgery, Hangang Sacred Heart Hospital, Hallym University College of Medicine, Seoul, South Korea
| | - Wook Chun
- Department of Surgery, Hangang Sacred Heart Hospital, Hallym University College of Medicine, Seoul, South Korea
| | - Byung-Jo Kim
- Department of Neurology, Korea University Anam Hospital, Korea University College of Medicine, Seoul, South Korea
- BK21FOUR R&E Center for Learning Health Systems, Korea University, Seoul, South Korea
- *Correspondence: Byung-Jo Kim
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Scholkmann F, Tachtsidis I, Wolf M, Wolf U. Systemic physiology augmented functional near-infrared spectroscopy: a powerful approach to study the embodied human brain. NEUROPHOTONICS 2022; 9:030801. [PMID: 35832785 PMCID: PMC9272976 DOI: 10.1117/1.nph.9.3.030801] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Accepted: 06/07/2022] [Indexed: 05/15/2023]
Abstract
In this Outlook paper, we explain why an accurate physiological interpretation of functional near-infrared spectroscopy (fNIRS) neuroimaging signals is facilitated when systemic physiological activity (e.g., cardiorespiratory and autonomic activity) is measured simultaneously by employing systemic physiology augmented functional near-infrared spectroscopy (SPA-fNIRS). The rationale for SPA-fNIRS is twofold: (i) SPA-fNIRS enables a more complete interpretation and understanding of the fNIRS signals measured at the head since they contain components originating from neurovascular coupling and from systemic physiological sources. The systemic physiology signals measured with SPA-fNIRS can be used for regressing out physiological confounding components in fNIRS signals. Misinterpretations can thus be minimized. (ii) SPA-fNIRS enables to study the embodied brain by linking the brain with the physiological state of the entire body, allowing novel insights into their complex interplay. We envisage the SPA-fNIRS approach will become increasingly important in the future.
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Affiliation(s)
- Felix Scholkmann
- University of Bern, Institute of Complementary and Integrative Medicine, Bern, Switzerland
- University Hospital Zurich, University of Zurich, Biomedical Optics Research Laboratory, Neonatology Research, Department of Neonatology, Zurich, Switzerland
| | - Ilias Tachtsidis
- University College London, Biomedical Optics Research Laboratory, Department of Medical Physics and Biomedical Engineering, London, United Kingdom
| | - Martin Wolf
- University Hospital Zurich, University of Zurich, Biomedical Optics Research Laboratory, Neonatology Research, Department of Neonatology, Zurich, Switzerland
| | - Ursula Wolf
- University of Bern, Institute of Complementary and Integrative Medicine, Bern, Switzerland
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