Search Results - "Heta, Helakari"

Spectral analysis of physiological brain pulsations affecting the BOLD signal by Raitamaa, Lauri, Huotari, Niko, Korhonen, Vesa, Helakari, Heta, Koivula, Anssi, Kananen, Janne, Kiviniemi, Vesa

“…Physiological pulsations have been shown to affect the global blood oxygen level dependent (BOLD) signal in human brain. While these pulsations have previously…”
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The variability of functional MRI brain signal increases in Alzheimer's disease at cardiorespiratory frequencies by Tuovinen, Timo, Kananen, Janne, Rajna, Zalan, Lieslehto, Johannes, Korhonen, Vesa, Rytty, Riikka, Mattila, Heli, Huotari, Niko, Raitamaa, Lauri, Helakari, Heta, Elseoud, Ahmed Abou, Krüger, Johanna, LeVan, Pierre, Tervonen, Osmo, Hennig, Juergen, Remes, Anne M., Nedergaard, Maiken, Kiviniemi, Vesa

“…Biomarkers sensitive to prodromal or early pathophysiological changes in Alzheimer’s disease (AD) symptoms could improve disease detection and enable timely…”
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Synchronous functional magnetic resonance eye imaging, video ophthalmoscopy, and eye surface imaging reveal the human brain and eye pulsation mechanisms by Ebrahimi, Seyed-Mohsen, Tuunanen, Johanna, Saarela, Ville, Honkamo, Marja, Huotari, Niko, Raitamaa, Lauri, Korhonen, Vesa, Helakari, Heta, Järvelä, Matti, Kaakinen, Mika, Eklund, Lauri, Kiviniemi, Vesa

“…The eye possesses a paravascular solute transport pathway that is driven by physiological pulsations, resembling the brain glymphatic pathway. We developed…”
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Sampling Rate Effects on Resting State fMRI Metrics by Huotari, Niko, Raitamaa, Lauri, Helakari, Heta, Kananen, Janne, Raatikainen, Ville, Rasila, Aleksi, Tuovinen, Timo, Kantola, Jussi, Borchardt, Viola, Kiviniemi, Vesa J, Korhonen, Vesa O

“…Low image sampling rates used in resting state functional magnetic resonance imaging (rs-fMRI) may cause aliasing of the cardiorespiratory pulsations over the…”
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Cardiovascular and vasomotor pulsations in the brain and periphery during awake and NREM sleep in a multimodal fMRI study by Tuunanen, Johanna, Helakari, Heta, Huotari, Niko, Väyrynen, Tommi, Järvelä, Matti, Kananen, Janne, Kivipää, Annastiina, Raitamaa, Lauri, Ebrahimi, Seyed-Mohsen, Kallio, Mika, Piispala, Johanna, Kiviniemi, Vesa, Korhonen, Vesa

“…The cerebrospinal fluid dynamics in the human brain are driven by physiological pulsations, including cardiovascular pulses and very low-frequency (< 0.1 Hz)…”
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Effect of sleep deprivation and NREM sleep stage on physiological brain pulsations by Helakari, Heta, Järvelä, Matti, Väyrynen, Tommi, Tuunanen, Johanna, Piispala, Johanna, Kallio, Mika, Ebrahimi, Seyed Mohsen, Poltojainen, Valter, Kananen, Janne, Elabasy, Ahmed, Huotari, Niko, Raitamaa, Lauri, Tuovinen, Timo, Korhonen, Vesa, Nedergaard, Maiken, Kiviniemi, Vesa

“…Sleep increases brain fluid transport and the power of pulsations driving the fluids. We investigated how sleep deprivation or electrophysiologically different…”
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Cardiovascular Pulsatility Increases in Visual Cortex Before Blood Oxygen Level Dependent Response During Stimulus by Huotari, Niko, Tuunanen, Johanna, Raitamaa, Lauri, Raatikainen, Ville, Kananen, Janne, Helakari, Heta, Tuovinen, Timo, Järvelä, Matti, Kiviniemi, Vesa, Korhonen, Vesa

“…The physiological pulsations that drive tissue fluid homeostasis are not well characterized during brain activation. Therefore, we used fast magnetic resonance…”
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Association of body-mass index with physiological brain pulsations across adulthood – a fast fMRI study by Raitamaa, Lauri, Kautto, Joona, Tuunanen, Johanna, Helakari, Heta, Huotari, Niko, Järvelä, Matti, Korhonen, Vesa, Kiviniemi, Vesa

“…Background/objective Obesity is a risk factor for several brain-related health issues, and high body-mass index (BMI) is associated with an increased risk for…”
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Human NREM Sleep Promotes Brain-Wide Vasomotor and Respiratory Pulsations by Helakari, Heta, Korhonen, Vesa, Holst, Sebastian C, Piispala, Johanna, Kallio, Mika, Väyrynen, Tommi, Huotari, Niko, Raitamaa, Lauri, Tuunanen, Johanna, Kananen, Janne, Järvelä, Matti, Tuovinen, Timo, Raatikainen, Ville, Borchardt, Viola, Kinnunen, Hannu, Nedergaard, Maiken, Kiviniemi, Vesa

“…The physiological underpinnings of the necessity of sleep remain uncertain. Recent evidence suggests that sleep increases the convection of cerebrospinal fluid…”
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Increased interictal synchronicity of respiratory related brain pulsations in epilepsy by Kananen, Janne, Järvelä, Matti, Korhonen, Vesa, Tuovinen, Timo, Huotari, Niko, Raitamaa, Lauri, Helakari, Heta, Väyrynen, Tommi, Raatikainen, Ville, Nedergaard, Maiken, Ansakorpi, Hanna, Jacobs, Julia, LeVan, Pierre, Kiviniemi, Vesa

“…Respiratory brain pulsations have recently been shown to drive electrophysiological brain activity in patients with epilepsy. Furthermore, functional…”
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Breath hold effect on cardiovascular brain pulsations – A multimodal magnetic resonance encephalography study by Raitamaa, Lauri, Korhonen, Vesa, Huotari, Niko, Raatikainen, Ville, Hautaniemi, Taneli, Kananen, Janne, Rasila, Aleksi, Helakari, Heta, Zienkiewicz, Aleksandra, Myllylä, Teemu, Borchardt, Viola, Kiviniemi, Vesa

“…Ultra-fast functional magnetic resonance encephalography (MREG) enables separate assessment of cardiovascular, respiratory, and vasomotor waves from brain…”
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Infra-slow fluctuations in cortical potentials and respiration drive fast cortical EEG rhythms in sleeping and waking states by Väyrynen, Tommi, Helakari, Heta, Korhonen, Vesa, Tuunanen, Johanna, Huotari, Niko, Piispala, Johanna, Kallio, Mika, Raitamaa, Lauri, Kananen, Janne, Järvelä, Matti, Matias Palva, J., Kiviniemi, Vesa

“…•Infra-slow fluctuations (ISF) and respiration are both coupled with fast neuronal oscillation amplitudes.•ISF and respiration drive amplitude dynamics of fast…”
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The relative brain signal variability increases in the behavioral variant of frontotemporal dementia and Alzheimer's disease but not in schizophrenia by Tuovinen, Timo, Häkli, Jani, Rytty, Riikka, Krüger, Johanna, Korhonen, Vesa, Järvelä, Matti, Helakari, Heta, Kananen, Janne, Nikkinen, Juha, Veijola, Juha, Remes, Anne M, Kiviniemi, Vesa

“…Overlapping symptoms between Alzheimer's disease (AD), behavioral variant of frontotemporal dementia (bvFTD), and schizophrenia (SZ) can lead to misdiagnosis…”
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Inverse correlation of fluctuations of cerebral blood and water concentrations in humans by Borchardt, Viola, Korhonen, Vesa, Helakari, Heta, Nedergaard, Maiken, Myllylä, Teemu, Kiviniemi, Vesa

“…Near-infrared spectroscopy (fNIRS) measures concentrations of oxygenated (HbO) and deoxygenated (HbR) hemoglobin in the brain. Recently, we demonstrated its…”
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Dynamic lag analysis reveals atypical brain information flow in autism spectrum disorder by Raatikainen, Ville, Korhonen, Vesa, Borchardt, Viola, Huotari, Niko, Helakari, Heta, Kananen, Janne, Raitamaa, Lauri, Joskitt, Leena, Loukusa, Soile, Hurtig, Tuula, Ebeling, Hanna, Uddin, Lucina Q., Kiviniemi, Vesa

“…This study investigated whole‐brain dynamic lag pattern variations between neurotypical (NT) individuals and individuals with autism spectrum disorder (ASD) by…”
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Altered physiological brain variation in drug‐resistant epilepsy by Kananen, Janne, Tuovinen, Timo, Ansakorpi, Hanna, Rytky, Seppo, Helakari, Heta, Huotari, Niko, Raitamaa, Lauri, Raatikainen, Ville, Rasila, Aleksi, Borchardt, Viola, Korhonen, Vesa, LeVan, Pierre, Nedergaard, Maiken, Kiviniemi, Vesa

“…Introduction Functional magnetic resonance imaging (fMRI) combined with simultaneous electroencephalography (EEG‐fMRI) has become a major tool in mapping…”
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Respiratory-related brain pulsations are increased in epilepsy—a two-centre functional MRI study by Kananen, Janne, Helakari, Heta, Korhonen, Vesa, Huotari, Niko, Järvelä, Matti, Raitamaa, Lauri, Raatikainen, Ville, Rajna, Zalan, Tuovinen, Timo, Nedergaard, Maiken, Jacobs, Julia, LeVan, Pierre, Ansakorpi, Hanna, Kiviniemi, Vesa

“…Abstract Resting-state functional MRI has shown potential for detecting changes in cerebral blood oxygen level-dependent signal in patients with epilepsy, even…”
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Hypertension Does Not Alter the Increase in Cardiac Baroreflex Sensitivity Caused by Moderate Cold Exposure by Hintsala, Heidi E, Kiviniemi, Antti M, Tulppo, Mikko P, Helakari, Heta, Rintamäki, Hannu, Mäntysaari, Matti, Herzig, Karl-Heinz, Keinänen-Kiukaanniemi, Sirkka, Jaakkola, Jouni J K, Ikäheimo, Tiina M

“…Exposure to cold increases blood pressure and may contribute to higher wintertime cardiovascular morbidity and mortality in hypertensive people, but the…”
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Synchronous functional magnetic resonance eye imaging, video ophthalmoscopy, and eye surface imaging reveal the human brain and eye pulsation mechanisms by Seyed-Mohsen, Ebrahimi, Johanna, Tuunanen, Ville, Saarela, Marja, Honkamo, Niko, Huotari, Lauri, Raitamaa, Vesa, Korhonen, Heta, Helakari, Mika, Kaakinen, Lauri, Eklund, Vesa, Kiviniemi

“…Recent research shows the eye has a paravascular solute transport pathway driven by physiological pulsations resembling the brain. we developed synchronous…”
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