Search Results - "Lauri, Raitamaa"

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…”
Get full text

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…”
Get full text

3D Multi-Resolution Optical Flow Analysis of Cardiovascular Pulse Propagation in Human Brain by Rajna, Zalan, Raitamaa, Lauri, Tuovinen, Timo, Heikkila, Janne, Kiviniemi, Vesa, Seppanen, Tapio

“…The brain is cleaned from waste by glymphatic clearance serving a similar purpose as the lymphatic system in the rest of the body. Impairment of the glymphatic…”
Get full text

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…”
Get full text

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…”
Get full text

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)…”
Get full text

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…”
Get full text

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…”
Get full text

Combined spatiotemporal ICA (stICA) for continuous and dynamic lag structure analysis of MREG data by Raatikainen, Ville, Huotari, Niko, Korhonen, Vesa, Rasila, Aleksi, Kananen, Janne, Raitamaa, Lauri, Keinänen, Tuija, Kantola, Jussi, Tervonen, Osmo, Kiviniemi, Vesa

“…This study investigated lag structure in the resting-state fMRI by applying a novel independent component (ICA) method to magnetic resonance encephalography…”
Get full text

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…”
Get full text

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…”
Get full text

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…”
Get full text

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…”
Get full text

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…”
Get full text

Physiological instability is linked to mortality in primary central nervous system lymphoma: A case–control fMRI study by Poltojainen, Valter, Kemppainen, Janette, Keinänen, Nina, Bode, Michaela, Isokangas, Juha‐Matti, Kuitunen, Hanne, Nikkinen, Juha, Sonkajärvi, Eila, Korhonen, Vesa, Tuovinen, Timo, Järvelä, Matti, Huotari, Niko, Raitamaa, Lauri, Kananen, Janne, Korhonen, Tommi, Tetri, Sami, Kuittinen, Outi, Kiviniemi, Vesa

“…Primary central nervous system lymphoma (PCNSL) is an aggressive brain disease where lymphocytes invade along perivascular spaces of arteries and veins. The…”
Get full text

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…”
Get full text

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…”
Get full text

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…”
Get full text

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…”
Get full text