Carl H. Lücking’s research while affiliated with Protestant University of Applied Sciences Freiburg and other places

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Publications (212)


Kernspintomographische Befunde bei M. Parkinson und MSA
  • Book

January 2013

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6 Reads

Elisabeth Feifel

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Sybilla Schneider

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D. Ott

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[...]

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On the Estimation of the Direction of Information Flow

March 2010

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17 Reads

Klinische Neurophysiologie

Introduction: The analysis of signals in the neurosciences raises several questions. One important issue is the detection of interactions between signals, as they promise to disclose the biological basis underlying the normal behavior or the abnormal functioning of certain networks. Here, it is of particular importance to reliably infer the direction of information flow. Some approaches to this aim have been suggested. We compare their abilities and limitations on simulated data as well as in an application to essential tremor. Material and Methods: Based on simulated data we investigate the abilities and limitations of frequently used analysis techniques which were suggested being capable of detecting the direction of information flow. The techniques are the maximum coherence approach (Govindan, R. B., et al., 2005. Estimation of time delay by coherence analysis. Physica A 350, 277–295), an approach based on the Hilbert phase (Timmermann, L., et al., 2003. The cerebral oscillatory network of Parkinsonian resting tremors. Brain 126, 199–212), the partial directed coherence (Baccala, L. A., Sameshima, K., 2001. Partial directed coherence: a new concept in neural structure determination. Biol. Cybern. 84, 463–474), and the partial directed correlation (Eichler, M., 2006. Graphical modeling of dynamic relationships in multivariate time series. In: Schelter, B., Winterhalder, M., Timmer, J. (Eds.), Handbook of Time Series Analysis. Wiley-VCH, Ch. 14, pp. 335–372). In an application to six patients suffering from essential tremor we show the applicability to actual data sets. Results: By means of a simulation study we characterize the abilities and limitations of the individual approaches. It turned out that the directed partial correlation approach is the most powerful one, allowing both to estimate the direction of information flow as well as the time lag reliably. In the application to essential tremor we could clearly demonstrate that tremor correlated cortical activity is composed of both directions, i.e. from the cortex to the muscles and vice versa. Conclusion: Although several techniques have been suggested in the literature addressing the same aim, i.e. to estimate the direction of information flow, they perform considerably different both on simulated as well as on actual data. Directed partial correlation turned out to be the best performing one.



A longitudinal study of tremor frequencies in Parkinson’s disease and essential tremor

February 2009

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76 Reads

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63 Citations

Clinical Neurophysiology

There is evidence that the tremor frequency in essential tremor (ET) decreases with time. Longitudinal studies on the evolution of tremor frequencies in Parkinson's disease (PD) have so far not been published. Here, we present a longitudinal analysis of tremor frequencies in PD and ET. We analyzed the standardized accelerometric and electromyographic tremor recordings of 53 patients with PD and 38 patients with ET who underwent repeated routine tremor recordings between 1991 and 2002. In an average follow-up period of 44.9 months in PD and 50.6 months in ET, the average number of tremor recordings was 3.3 in PD and 3.7 in ET. In both disorders, tremor frequencies tended to decrease with time. The average annual decrease of the tremor frequency was 0.09 Hz/year in Parkinsonian rest tremor, 0.08 Hz/year in Parkinsonian postural tremor and 0.12 Hz/year in ET. The tremor frequency decreases with time in both PD and ET. The similarity of this decrease in PD and ET may point to a common underlying pathophysiological mechanism. Decreasing tremor frequencies with time may be functionally important by inducing larger tremor amplitudes due to the low-pass filtering properties of muscles and limbs.



Multivariate analysis of dynamical processes. Point processes and time series

December 2008

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33 Reads

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10 Citations

The European Physical Journal Special Topics

The analysis of multi-dimensional biomedical systems requires analysis techniques, which are able to deal with multivariate data consisting of both time series as well as point processes. Univariate and bivariate analysis techniques in the frequency domain for time series and point processes are established and investigated, although the number of investigations is strongly biased towards time series. Actual multivariate techniques for time series or hybrids of time series and point processes are scarcely addressed. Here, we present spectral analysis techniques which are able to analyse point processes as well as time series. Thereby, univariate, bivariate as well as multivariate techniques are discussed. Applications to simulated as well as real-world data reveal the abilities of the proposed techniques.



Citations (67)


... Gait disorders secondary to conditions such as arthritis, orthostatic hypotension, Parkinson disease, vitamin B 12 deficiency, hypothyroidism, heart rate or rhythm abnormalities, or depression may respond to medical therapies. 16,23,29 Although data are limited, surgery may improve gait for patients with cervical spondylotic myelopathy, 51 lumbar spinal stenosis, 52 normal-pressure hydrocephalus, 53 or arthritis of the knee or hip. 54,55 Insertion of pacemakers in patients with carotid sinus hypersensitivity and first eye cataract surgery have been shown to reduce the rate of falls. ...

Reference:

Gait and Balance Disorders in Older Adults
Evaluation of gait in normal pressure hydrocephalus before and after shunting
  • Citing Book
  • January 2000

... Like other measures, the PERG response is highly dependent on the spatial, temporal and contrast characteristics of the stimuli used, such as gratings or checkerboards. However, studies have consistently shown alterations in both latencies and amplitudes of PERGs in PD (Nightingale et al., 1986;Gottlob et al., 1987;Peppe et al., 1992Peppe et al., , 1998Langheinrich et al., 2000;Sartucci et al., 2006). In contrast to a global reduction in amplitude of PERG response, to a variety of sinusoidal grating spatial frequencies, in age-matched controls compared to young controls, PD patients have shown a specific medium-frequency deficit (Tagliati et al., 1996), the region of peak sensitivity of CS for a normal observer. ...

Contrast response functions in Parkinson's disease (PD) measured by PERG, VEP and psychophysics
  • Citing Article
  • January 1999

... An example to demonstrate this is the correlation coefficient, quantifying the bivariate interaction, and its multivariate counterpart the partial correlation. We will use this as an example throughout the manuscript, but our approach is readily applicable to other linear interaction measures such as coherence and partial coherence 13,15 as well as nonlinear interaction measures such as the phase synchronisation and partial phase synchronisation approach 16 . We propose a new method to reconstruct the multivariate network that reduces the dimensionality of the correlation matrix by automatically merging highly correlated nodes before inverting the matrix. ...

Multivariate analysis of dynamical processes. Point processes and time series
  • Citing Article
  • December 2008

The European Physical Journal Special Topics

... 50 Rarer and poorly understood are palatal, dystonic, orthostatic, task-and position-specific, Holmes', cerebellar, and neuropathic tremors. 60 Among PMDs, tremor is the most common phenomenon. 61 Tremors and their physiologic generators are characterized as mechanical, peripherally induced, or central according to the source of their oscillatory activity. ...

Chapter 25 Uncommon tremors
  • Citing Article
  • December 2003

Handbook of Clinical Neurophysiology

... Zur Abgrenzung zum Spasmus hemifacialis hilft auch das Babinski-Zeichen-2, da beim Spasmus hemifacialis bei der Kontraktion des M. orbicularis oculi die Augenbraue gleichzeitig und unwillkürlich durch Aktivierung des M. frontalis angehoben wird. Hier kann auch der Blinkreflex mit Nachweis einer lateral spread response[11] hilfreich sein. Der Blinkreflex kann auch zur Differentialdiagnostik bei möglichen Synkinesien nach peripherer Facialisparese genutzt werden. ...

Elektrische und magnetische Reiztechniken zur Diagnostik der Fazialisparese und des Hemispasmus facialis
  • Citing Article
  • June 1998

Klinische Neurophysiologie

... Genome-wide association studies (GWAS) identified >20 LOAD risk genes linked to endocytosis, inborn immunity, and lipid metabolism [143,145]. EOAD is typically diagnosed between 40 and 50 years of age, comprises 5% of the total AD cases [146], is linked to a defect in chromosome 14 and myoclonus [147,148], and, therefore, it is referred to as a distinctive autosomal dominant inherited form of AD [140]. Usually, people with Down's syndrome are more prone to EOAD [149]. ...

Early-onset Alzheimer's disease due to mutations of the presenilin-1 gene on chromosome 14: A 7-year follow-up of a patient with a mutation at codon 139
  • Citing Article
  • July 1998

European Archives of Psychiatry and Clinical Neuroscience

... Surprisingly, although reading mirrored script has attracted a substantial amount of attention in cognitive science (Chandra et al., 2020;Kowler & Anton, 1987;Rabe et al., 2021) and neuroscience (Kassubek et al., 2001;Poldrack et al., 1998;Poldrack & Gabrieli, 2001;Ryan & Schnyer, 2007), studies investigating readers' eye movements while reading mirrored script are relatively scarce and have mainly focused on saccade targeting. For example, Kowler and Anton (1987) investigated the eye movements of two participants who read texts in which individual letters, words, or whole texts were either vertically or horizontally mirrored. ...

Changes in cortical activation during mirror reading before and after training: an fMRI study of Procedural Learning
  • Citing Article
  • February 2001

Cognitive Brain Research

... Учитывая неоднородность клинических проявлений, длительность заболевания, а также предполагаемое различие механизмов развития тремора при БП, можно предположить, что препараты, применяемые при БП, имеют разное влияние на симптомы заболевания, в том числе и на дрожательный гиперкинез [5][6][7][8]. Также необходимо отметить, что большинство клинических исследований, посвященных эффективности коррекции дрожательного гиперкинеза, основаны на субъективных оценках пациента и/или специалиста и не включают сравнение результативности более чем двух противопаркинсонических средств. ...

A test for a difference between spectral peak frequencies
  • Citing Article
  • February 1999

Computational Statistics & Data Analysis

... Clinical features include spontaneous remissions, paroxysmal exacerbations, the coexistence of rest, postural and action tremors, and fluctuating frequency and amplitude. [63][64][65][66][67][68][69][70] Symptoms are often modulated by cognitive or emotional factors, serving as diagnostic clues. ...

Diagnostic and pathological aspects of psychogenic tremors
  • Citing Article
  • March 1998

Movement Disorders

... Previous clinical studies on the effect of disease progression on tremor produce mixed conclusions. One longitudinal study on PD tremor frequency found that frequency decreases by approximately 0.1 Hz per year, on average [52]. However, a significant change in frequency was only observed in about half of the patients, with 30% of those patients exhibiting a frequency increase rather than decrease. ...

A longitudinal study of tremor frequencies in Parkinson’s disease and essential tremor
  • Citing Article
  • February 2009

Clinical Neurophysiology