A5012665716- Non-Invasive Vital Sign Monitoring
- Optical Imaging and Spectroscopy Techniques
- Functional Brain Connectivity Studies
- EEG and Brain-Computer Interfaces
- Neural dynamics and brain function
- Hemodynamic Monitoring and Therapy
- Heart Rate Variability and Autonomic Control
- Neural and Behavioral Psychology Studies
- Paranormal Experiences and Beliefs
- Language, Metaphor, and Cognition
- Neuroscience and Neural Engineering
- Psychosomatic Disorders and Their Treatments
- Categorization, perception, and language
- Cardiovascular and Diving-Related Complications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Balance, Gait, and Falls Prevention
- Olfactory and Sensory Function Studies
- Neural Networks and Applications
- Motor Control and Adaptation
- Neuroscience, Education and Cognitive Function
- Cardiovascular Health and Disease Prevention
- Multisensory perception and integration
Radboud University Nijmegen
2013-2023
Centre for Medical Systems Biology
2021
Maastricht University
2009
We propose the signal quality index (SQI) algorithm as a novel tool for quantitatively assessing functional near infrared spectroscopy (fNIRS) in numeric scale from 1 (very low quality) to 5 high quality). The comprises two preprocessing steps followed by three consecutive rating stages. results on dataset annotated independent fNIRS experts showed SQI performed significantly better (p<0.05) than PHOEBE (placing headgear optodes efficiently before experimentation) and SCI (scalp coupling...
World knowledge influences how we perceive the world. This study shows that this influence is at least partly mediated by declarative memory. Dutch and German participants categorized hues from a yellow-to-orange continuum on stimuli were prototypically orange or yellow also associated with these color labels. Both groups gave more "yellow" responses if an ambiguous hue occurred stimulus. The language tested stimulus (traffic light) label in German, even though objective same for both...
Continuous measurements of haemodynamic and oxygenation changes in free living animals remain elusive. However, developments biomedical technologies may help to fill this knowledge gap. One such technology is continuous-wave near-infrared spectroscopy (CW-NIRS)—a wearable non-invasive optical technology. Here, we develop a marinized CW-NIRS system deploy it on elite competition freedivers test its capacity function during deep freediving 107 m depth. We use the oxyhaemoglobin...
Recent studies have established that cardiac and respiratory phases can modulate perception related neural dynamics. While heart rate sinus arrhythmia possibly affect interoception biomarkers, such as heartbeat-evoked potentials, the relative changes in cardiorespiratory dynamics interoceptive processes not yet been investigated. In this study, we investigated variation breathing rates, well higher functional including correlation frontal hemodynamics measured with fNIRS, during a heartbeat...
Here, we report evidence for oscillatory bi-directional interactions between the nucleus accumbens and neocortex in humans. Six patients performed a demanding covert visual attention task while simultaneously recorded brain activity from deep-brain electrodes implanted surface electroencephalogram (EEG). Both theta alpha oscillations were strongly coherent with frontal parietal EEG during task. Theta-band coherence increased processing of stimuli. Granger causality analysis revealed that was...
Functional near-infrared spectroscopy (fNIRS) is a popular neuroimaging technique with proliferating hardware platforms, analysis approaches, and software tools. There has not been standardized file format for storing fNIRS data, which hindered the sharing of data as well adoption development
Increased oxygenated hemoglobin concentration of the prefrontal cortex (PFC) has been observed during linear walking, particularly when there is a high attention demand on task, like in dual-task (DT) paradigms. Despite knowledge that cognitive and motor demands depend complexity most studies have only focused usual while little known for more challenging tasks, such as curved paths. To explore relationship between cortical activation gait biomechanics, 20 healthy young adults were asked to...
The employment of wearable systems for continuous monitoring vital signs is increasing. However, due to substantial susceptibility conventional bio-signals recorded by motion artifacts, estimation the respiratory rate (RR) during physical activities a challenging task. Alternatively, functional Near-Infrared Spectroscopy (fNIRS) can be used, which has been proven less vulnerable subject's movements. This paper proposes fusion-based method estimating RR bicycling from fNIRS signals...
Objective: Respiration is recognized as a systematic physiological interference in functional near-infrared spectroscopy (fNIRS). However, it remains unanswered to whether possible estimate the respiratory rate (RR) from such interference. Undoubtedly, RR estimation fNIRS can provide complementary information that be used alongside cerebral activity analysis, e.g., sport studies. Thus, objective of this paper propose method for fNIRS. Our primary presumption changes baseline wander...
Emotional cues draw attention, thereby enabling enhanced processing. Electrophysiological brain research in humans suggests that increased gamma band activity and decreased alpha over posterior areas is associated with the allocation of attention. However, emotional events can alternate quickly, like rapidly changing news items it remains unknown whether modulation oscillations happens a stimulus induced manner, each individual stimulus, or lead to prolonged, state-like changes. To...
Background: Near-infrared spectroscopy (NIRS) relative concentration signals contain 'noise' from physiological processes such as respiration and heart rate. Simultaneous assessment of NIRS respiratory rate (RR) using a single sensor would facilitate perfectly time-synced (cerebral) physiology. Our aim was to extract cerebral intensity in neonates admitted neonatal intensive care unit (NICU). Methods: A novel algorithm, NRR (NIRS RR), is developed for extracting RR recorded critically ill...
Sleep, notably active sleep (AS) and quiet (QS), plays a pivotal role in the brain development gradual maturation of (pre) term infants. Monitoring their patterns is imperative, as it can serve tool promoting neurological well-being, particularly important preterm infants who are at an increased risk immature development. An accurate classification neonatal states contribute to optimizing treatments for high-risk infants, with respiratory rate (RR) heart (HR) serving key components...
Motion is disruptive to neuroimaging methods. artefacts range from large amplitude and short frequency spikes drifts in causing cofounds the analysis or completely invalidating any analysis, leading epoch exclusion of data. However, we can only acquire ecologically robust information if subjects are engaging natural interaction with their environment. Even more so case sports, infants motor disorder afflicted populations, where movement will happen. We proposed study relationship between...
Functional Near-Infrared Spectroscopy (fNIRS) is gaining popularity in detection and classification of cognitive emotional states. In addition to hemodynamic responses arising from functional activity changes the brain areas interest, fNIRS signals contain components related other physiological processes, such as respiration (frequency oscillations around 0.3 Hz) cardiac pulsation (around 1 Hz). While heart rate measures have been successfully used separate modalities assess mental workload,...
Functional near infrared spectroscopy (fNIRS) is used for brain hemodynamic assessment. Cortical hemodynamics are reliably estimated when the recorded signal has a sufficient quality. This acquired fNIRS optodes have proper scalp coupling. A lack of coupling causes false positives and negatives. Therefore, developing an objective algorithm determining quality great importance. In this study, we developed machine learning-based quantitatively rating Our promising results confirm efficacy in...
Near-infrared spectroscopy (NIRS) intensity signals provide useful additional physiological information of which the most prominent one is pulsatile fluctuation by heartbeats. This allows for extraction heart rate (HR), primary clinical indicators health in neonates. In this study, we propose a novel algorithm, NHR (NIRS HR), extracting HR from NIRS acquired neonates admitted to neonatal intensive care unit. After parental consent, recorded synchronously NIRS, at 100 Hz, and reference HR, 1...
Noninvasive functional near infra-red spectroscopy (fNIRS) measuring brain oxygenated (O2Hb) and deoxygenated hemoglobin (HHb) is a promising technique for studying dementia diseases. fNIRS signals are determined by cerebral extracerebral factors. The simultaneous measurement of as many possible anatomical physiological factors during the prerequisite to interpret with respect degree tissue oxygenation blood flow microcirculation.
Abstract Recent studies have established that cardiac and respiratory phases can modulate perception related neural dynamics. While heart rate sinus arrhythmia possibly affect interoception biomarkers, such as heartbeat-evoked potentials, the relative changes in cardiorespiratory dynamics interoceptive processes not yet been investigated. In this study, we investigated variation breathing rates, well higher functional including correlation frontal hemodynamics measured with fNIRS, during a...