Conventional and Wavelet Coherence Applied to Sensory–Evoked Electrical Brain Activity

Klein, Arno; Sauer, Tomas; Jedynak, A.; Skrandies, Wolfgang

doi:10.1109/tbme.2005.862535

Cited by 90 publications

(75 citation statements)

References 14 publications

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“…Coherence analyses have been used in various EEG and fMRI studies as complementary tool to investigate the dynamic relationship between the central and autonomic nervous system, in particular when a priori assumptions of linear coupling are made (Chang and Glover, 2010;Klein et al, 2006;Li et al, 2007;Müller et al, 2004).…”

Section: Coherence Between Fnirs and Edamentioning

confidence: 99%

Comparison of functional near-infrared spectroscopy and electrodermal activity in assessing objective versus subjective risk during risky financial decisions

Holper¹,

Wolf²,

Tobler

2014

NeuroImage

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Risk is an important factor impacting financial decisions. Risk can be processed objectively, e.g. as variance across possible outcomes of a choice option or subjectively, e.g. as value of that variance to a given individual. The aim of the present study was to test the potential of functional near-infrared spectroscopy (fNIRS) in assessing these different ways of processing risk while subjects decided between either high or low risk financial options or a safe (risk-free) option. For comparison we simultaneously measured electrodermal activity (EDA), a well-established method in decision-making research and a core measure of affective processes. FNIRS showed that lateral prefrontal cortex responses to high risk were enhanced relative to low risk only in risk-seeking individuals but reduced relative to low risk in risk-averse individuals. This is in-line with individual-specific risk processing reflecting the subjective value of risk. By contrast, EDA showed enhanced responses to high risk, independent of individual risk attitude, in-line with the notion of objective risk processing. The dissociation between the two measures arose even though they overall were equally sensitive to detect individual risk-related differences and even though there was an increased, risk attitude-independent, temporal coherence between the two measures during high-risk conditions. Our results suggest that hemodynamic responses in lateral prefrontal cortex as measured by fNIRS reflect the subjective value of risk, whereas EDA may index the objective amount of risk people are presented with. The findings suggest that fNIRS could be a useful method for studying risk behavior in financial decisions. AbstractRisk is an important factor impacting financial decisions. Risk can be processed objectively, e.g. as variance across possible outcomes of a choice option or subjectively, e.g. as value of that variance to a given individual. The aim of the present study was to test the potential of functional near-infrared spectroscopy (fNIRS) in assessing these different ways of processing risk while subjects decided between either high or low risk financial options or a safe (risk-free) option. For comparison we simultaneously measured electrodermal activity (EDA), a well-established method in decision-making research and a core measure of affective processes. FNIRS showed that lateral prefrontal cortex responses to high risk were enhanced relative to low risk only in risk-seeking individuals but reduced relative to low risk in risk-averse individuals. This is in-line with individual-specific risk processing reflecting the subjective value of risk. By contrast, EDA showed enhanced responses to high risk, independent of individual risk attitude, in-line with the notion of objective risk processing. The dissociation between the two measures arose even though they overall were equally sensitive to detect individual risk-related differences and even though there was increased, risk attitude-independent, temporal coherence between the two me...

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Section: Coherence Between Fnirs and Edamentioning

confidence: 99%

Comparison of functional near-infrared spectroscopy and electrodermal activity in assessing objective versus subjective risk during risky financial decisions

Holper¹,

Wolf²,

Tobler

2014

NeuroImage

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“…However, coherence measures exhibiting time resolution have been proposed on the basis of the Morlet wavelet transform. This "wavelet transform coherence" is quite popular in geophysics [34], [35], but has also been used in the biomedical field [36].…”

Section: A Synchrony Is Not Coherencementioning

confidence: 99%

Source Separation and Clustering of Phase-Locked Subspaces

Almeida

Schleimer

Bioucas-Dias

et al. 2011

IEEE Trans. Neural Netw.

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Abstract-It has been proven that there are synchrony (or phase-locking) phenomena present in multiple oscillating systems such as electrical circuits, lasers, chemical reactions, and human neurons. If the measurements of these systems cannot detect the individual oscillators but rather a superposition of them, as in brain electrophysiological signals (electo-and magneoencephalogram), spurious phase locking will be detected. Current source-extraction techniques attempt to undo this superposition by assuming properties on the data, which are not valid when underlying sources are phase-locked. Statistical independence of the sources is one such invalid assumption, as phase-locked sources are dependent. In this paper, we introduce methods for source separation and clustering which make adequate assumptions for data where synchrony is present, and show with simulated data that they perform well even in cases where independent component analysis and other well-known sourceseparation methods fail. The results in this paper provide a proof of concept that synchrony-based techniques are useful for lownoise applications.

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“…Also in 2006, Klein et al (2006) have introduced a variant of the MSC, the Wavelet Coherence (WC), which allowed obtaining the temporal information that is lost when frequencydomain techniques are used. (2006) proposed a methodology based on the MSC in order to study EEG activities that are synchronized in time (time-locked) with the stimulation signal, but non-synchronized in phase (non phase-locked).…”

Section: Univariate Ord Techniquesmentioning

confidence: 99%

Frequency-Domain Objective Response Detection Techniques Applied to Evoked Potentials: A Review

Melges¹,

Sá²,

Infantosi³

2012

Applied Biological Engineering - Principles and Practice

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Conventional and Wavelet Coherence Applied to Sensory–Evoked Electrical Brain Activity

Cited by 90 publications

References 14 publications

Comparison of functional near-infrared spectroscopy and electrodermal activity in assessing objective versus subjective risk during risky financial decisions

Comparison of functional near-infrared spectroscopy and electrodermal activity in assessing objective versus subjective risk during risky financial decisions

Source Separation and Clustering of Phase-Locked Subspaces

Frequency-Domain Objective Response Detection Techniques Applied to Evoked Potentials: A Review

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