Physiological Noise Removal from fNIRS Signals

Bauernfeind, Günther; Böck, Carl; Wriessnegger, Selina; Müller-Putz, Gernot

doi:10.1515/bmt-2013-4430

Cited by 13 publications

(16 citation statements)

References 5 publications

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“…Additionally, trials containing motion artifacts were excluded for calculating task‐related changes and topographic distributions. A common average reference (CAR) spatial filtering approach (Bauernfeind et al, ) was used to reduce global influences from the [oxy‐Hb] signals. The idea behind the application of CAR is the fact that the global interfering signals influence all channels and hence can be reduced by calculating the mean of all channels and subtracting it from each single channel and for each time point.…”

Section: Methodsmentioning

confidence: 99%

“…These signals, including quasi-periodic physiological rhythms like heart pulsation, breathing cycles, or low-frequency oscillations of the blood pressure but also task-evoked changes (systemic global influences; for details, see Bauernfeind et al, 2014), can mask the cerebral activation patterns. Therefore, also an effective reduction of these influences is required (Bauernfeind, B€ ock, Wriessnegger, & M€ uller-Putz, 2013;Bauernfeind et al, 2014;Boas, Dale, & Franceschini, 2004;Heinzel et al, 2013;Kirlilna et al, 2013). In recent years, fNIRS has been used primarily for cognitive, visual, or motor neurosciences (for an overview, see Bauernfeind, 2012;Ferrari & Quaresima, 2012).…”

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confidence: 99%

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Cortical activation patterns to spatially presented pure tone stimuli with different intensities measured by functional near‐infrared spectroscopy

Bauernfeind

Wriessnegger

Haumann

et al. 2018

Human Brain Mapping

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Functional near-infrared spectroscopy (fNIRS) is an emerging technique for the assessment of functional activity of the cerebral cortex. Recently fNIRS was also envisaged as a novel neuroimaging approach for measuring the auditory cortex activity in the field of in auditory diagnostics. This study aimed to investigate differences in brain activity related to spatially presented sounds with different intensities in 10 subjects by means of functional near-infrared spectroscopy (fNIRS). We found pronounced cortical activation patterns in the temporal and frontal regions of both hemispheres. In contrast to these activation patterns, we found deactivation patterns in central and parietal regions of both hemispheres. Furthermore our results showed an influence of spatial presentation and intensity of the presented sounds on brain activity in related regions of interest. These findings are in line with previous fMRI studies which also reported systematic changes of activation in temporal and frontal areas with increasing sound intensity. Although clear evidence for contralaterality effects and hemispheric asymmetries were absent in the group data, these effects were partially visible on the single subject level. Concluding, fNIRS is sensitive enough to capture differences in brain responses during the spatial presentation of sounds with different intensities in several cortical regions. Our results may serve as a valuable contribution for further basic research and the future use of fNIRS in the area of central auditory diagnostics.

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Cortical activation patterns to spatially presented pure tone stimuli with different intensities measured by functional near‐infrared spectroscopy

Bauernfeind

Wriessnegger

Haumann

et al. 2018

Human Brain Mapping

View full text Add to dashboard Cite

show abstract

“…Third, because we employed a cross-sectional design, we could not examine the longitudinal causal relationships between occupational burnout and cortical activity. Fourth, we cannot totally exclude the influences of physiological noises on NIRS signals as we did not use signal processing approaches such as common average reference, adaptive filtering or transfer function models42. Fifth, since most of the study participants were female, we did not investigate the effects of menstrual cycle on brain function, as it has been shown that estrogen and progesterone have a modulatory effect on brain activity43.…”

Section: Limitationsmentioning

confidence: 99%

Perceived Occupational Stress is associated with Decreased Cortical Activity of the Prefrontal Cortex: A Multichannel Near-infrared Spectroscopy Study

Chou

Lin

Hung

et al. 2016

Sci Rep

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Despite an increasing number of reports on the associations between chronic occupational stress and structural and functional changes of the brain, the underlying neural correlates of perceived occupational stress is still not clear. Perceived stress reflects the extents to which situations are appraised as stressful at a given point in one’s life. Using near-infrared spectroscopy, we investigated the associations between perceived occupational stress and cortical activity over the bilateral frontotemporal regions during a verbal fluency test. Sixty-eight participants (17 men, 51 women), 20–62 years of age were recruited. Perceived occupational stress was measured using the Chinese version of Job Content Questionnaire, and the Chinese version of the Copenhagen Burnout Inventory. We found statistically significant negative associations between occupational burnout and brain cortical activity over the fronto-polar and dorsolateral prefrontal cortex during the VFT (r = −0.343 to −0.464). In conclusion, our research demonstrated a possible neural basis of perceived occupational stress that are distributed across the prefrontal cortex.

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“…Second, the number of repetitions of the stimulus should be large enough to obtain statistical significance for the difference between stimulus conditions. Moreover, several recent studies have shown certain problematic aspects with NIRS measurements, such as systemic artifacts 78,79 or the differential pathlength factors (DPFs). 80 DPF can be measured using time-or frequency-domain instrumentation, but continuous wave NIRS users have to rely on the literature values for this parameter.…”

Section: Methodological Considerations and Limitationsmentioning

confidence: 99%

Emotional Processing in the First 2 Years of Life: A Review of Near‐Infrared Spectroscopy Studies

Maria

Shekhar

Nissilä

et al. 2018

Journal of Neuroimaging

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Emotional stimuli processing during childhood helps us to detect salient cues in our environment and prepares us for our social life. In early childhood, the emotional valences of auditory and visual input are salient and relevant cues of social aspects of the environment, and it is of special interest to understand how exactly the processing of emotional stimuli develops. Near‐infrared spectroscopy (NIRS) is a noninvasive neuroimaging tool that has proven valuable in studying emotional processing in children. After conducting a systematic search of PubMed, Web of Science, and Embase databases, we examined 50 NIRS studies performed to study emotional stimuli processing in children in the first 2 years of age. We found that the majority of these studies are done in infants and the most commonly used stimuli are visual and auditory. Many of the reviewed studies suggest the involvement of bilateral temporal areas in emotional processing of visual and auditory stimuli. It is unclear which neural activation patterns reflect maturation and at what age the emotional encoding reaches those typically seen in adults. Our review provides an overview of the database on emotional processing in children up to 2 years of age. Furthermore, it demonstrates the need to include the less‐studied age range of 1 to 2 years, and suggests the use of combined audio‐visual stimuli and longitudinal studies for future research on emotional processing in children. Thus, NIRS might be a vital tool to study the associations between the early pattern of neural responses and socioemotional development later in life.

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Physiological Noise Removal from fNIRS Signals

Cited by 13 publications

References 5 publications

Cortical activation patterns to spatially presented pure tone stimuli with different intensities measured by functional near‐infrared spectroscopy

Cortical activation patterns to spatially presented pure tone stimuli with different intensities measured by functional near‐infrared spectroscopy

Perceived Occupational Stress is associated with Decreased Cortical Activity of the Prefrontal Cortex: A Multichannel Near-infrared Spectroscopy Study

Emotional Processing in the First 2 Years of Life: A Review of Near‐Infrared Spectroscopy Studies

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