The contribution of EEG coherence analysis to the investigation of cognition and, in particular, language processing is demonstrated with examples of recent EEG studies. The concept of EEG coherence analysis is explained, and its importance emphasized in the light of recent neurobiological findings on frequency-dependent synchrony as a code of information processing between nerve cell assemblie...

INTRODUCTION Resting-state functional MRI analysis techniques that determine the similarity between time varying signals of seed and target regions (e.g., by crosscorrelation in the time domain [1,2] and coherence in the frequency domain [3,4]) assume the signals are stationary. However, the resting-state is neither a static phenomenon nor is reproducible [5]; it varies greatly within and betwe...

Electroencephalogram (EEG) coherence is a mixture of phase locking interrupted by phase shifts in the spontaneous EEG. Average reference, Laplacian transforms, and independent component (ICA) reconstruction of time series can distort physiologically generated phase differences and invalidate the computation of coherence and phase differences as well as in the computation of directed coherence a...

Introduction The purpose of this study was to develop a fMRI technique with contrast dependent on intermolecular double quantum coherence (iDQC). Long-range intermolecular multiple quantum coherence phenomena have been observed for several years in solutions [1-3], but an early attempt to use iDQC contrast in vivo gave poor results [4]. A recent study of rat brain demonstrated that zero-quantum...

There is increasing evidence that hand immobilization is associated with various changes in the brain. Indeed, beta band coherence is strongly related to motor act and sensitive stimuli. In this study we investigate the electrophysiological and cortical changes that occur when subjects are submitted to hand immobilization. We hypothesized that beta coherence oscillations act as a mechanism unde...

Introduction: In the central nervous system, glycine has a dual role as inhibitory neurotransmitter activating glycine receptors [1] and as co-agonist for glutamate excitatory transmission through N-methyl-D-aspartate receptors [2]. The medulla oblongata (MO) is the part of the brainstem which regulates autonomic functions, such as heart beat, breathing and blood pressure. In the MO, glycine is...

Kocsis, Bernat, Tomas Karlsson, and B. Gunnar Wallin. Cardiacand noncardiac-related coherence between sympathetic drives to muscles of different human limbs. Am. J. Physiol. 276 (Regulatory Integrative Comp. Physiol. 45): R1608–R1616, 1999.—Partial coherence analysis was used to evaluate the extent to which coherence between resting muscle sympathetic activity (MSA) in different pairs of limbs ...

Many controversies in medical science can be framed as tension between a coherence approach (which seeks logic and explanation) and a correspondence approach (which emphasizes empirical correctness). In many instances, a coherencebased theory leads to an understanding of disease that is not supported by empirical evidence. Physicians and patients alike tend to favor the coherence approach even ...

Partial coherence analysis was used to remove the influences of pulse-synchronous baroreceptor nerve activity (as reflected by the arterial pulse) on the coherence of the cardiac-related discharges of sympathetic nerve pairs in unanesthetized decerebrate cats. It can be predicted that the peak at the heart rate frequency in the ordinary coherence function relating the discharges of two nerves w...

Abstract Introduction Experimental studies have fueled theoretical concerns about neurocognitive side effects of the angiotensin-receptor-neprilysin-inhibitor (ARNi) sacubitril/valsartan as neprilysin is not only involved in degradation vasoactive peptides, but also amyloid-β brain. To date, no study could demonstrate cognition- and dementia-related adverse following neprilysin-inhibition. Rece...