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It is expected that in the next years to come neurodegenerative diseases will be monitored by speech as a daily routine Cecchi, Recordings of long aloud vowels were selected and processed to obtain the first two formants, and the respective distributions of their AKV were estimated as referred before.

The aim of the present study is to evaluate if features derived from the dynamic behavior of formants in sustained vowels are related with some of the indices used by neurologists, and to establish to which extent dynamic measures can be neurpmotor in the multimodal study of PD speech production. Elements of information theory.

control neuromotor del habla pdf merge

A proposal for a new acoustic measure of dysarthric speech. Robust and complex approach of pathological speech signal analysis. Kinematic modelling of diphthong articulation. It will also be assumed that the system given by 1 may be considered linear, time-invariant and invertible:. This estimator appears to be related to other motor and non-motor correlates used currently in the clinical monitoring of PD patients by neurologists.

This fact stresses the need of developing objective scoring methods, especially in relation to speech production. It may be seen that horizontal and vertical velocities behave quite differently than in the normative case.


Speech is the result of a biomechanical sequence of actuations led by neuromotor activity of chest, neck, oral, nasal and facial muscles under strict coordination. Sleep Medicine, 16 1 Probability density functions of the AKV from female healthy controls filesright axis and female PD patients filesright axis.

The large loops in the right part of the polar plot in Figure 6a are related to changes of the reference point due to adjustments of the jaw-tongue system in vowel onsets, whereas vowel nuclei activity is seen as a cloud of small amplitude actions near the center.

The present work is devoted to explore how PD affects the dynamic behavior of the speech neuromotor biomechanics neuromechanics involved in deficient articulation dysarthriain contrast to classical measurements based on static features as extreme and central vowel triangle positions.

Regarding the biomechanical model, the jaw J is fixed to the skull bone at fulcrum F as in a third-class lever system. The algorithmic methodology implied in the process of deriving kinematic variables from acoustical ones depends on the estimation and association of formant derivatives in time with the reference point kinematics as:.

In the case of PD patients uttering sustained vowels or sequences of vowels, the activity in R2, R3 and R4 is expected to be larger than in controls. Physiological Reviews, 85, But, in general, it may be concluded that a certain degree of correlation between formant dynamics and a wide set of motor and non-motor scoring scales exist in PD, and could be conveniently exploited if fused with other articulation static features such as VSA or FCR Sapir et al.

Linear regression lines have been drawn and formulated for comparison purposes.

The structure of the present paper is as follows: A control model of human tongue movements in speech. Assessing correlations between lingual movements and formants. No matter cotrol well designed they may be or well-trained raters are, a human subjective factor is implicit and difficult to be removed.


control neuromotor del habla pdf free – PDF Files

A review with implications for clinical practice and research. The relevance of speech in monitoring illness progression has been documented in these last two decades. Brain, 4 For instance, in pathologies were sentences are used to detect the residual articulation competence, as in Amyotrophic Lateral Sclerosis, it will be expected that neuuromotor from patients will show less activity in R3 and R4 than controls.

The first two formants were smoothened to eliminate glitches and other hazards and artifacts on the kinematic habls by a low-order predictive filter. Formant positions are obtained either from the local maxima of the transfer function in each time instant or from the polar positions of the prediction polynomials used to invert the speech segment. Rough and asthenic phonation, monotonicity, mono-loudness, freezing, neuomotor incompetence, and low tone are some of the observed alterations of speech coined with the term hypokinetic dysarthria Sapir, The field of speech analysis for biomedical applications is of great interest, and it opens new and exciting research lines to speech scientists.

Monitoring Parkinson Disease from speech articulation kinematics

Therefore, hypo- hyper- or unstable muscle tone are markers of possible PD neurodegeneration, and these can be traced from speech. This neurmootor not an uncommon situation in this kind of studies, as generally models and analysis protocols were initially designed on a male population, and, only latter on, they were adapted to a female population. Lateral movements orthogonal to the sagittal plane are assumed small enough to be neglected two degrees of freedom.