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Robust and sel approach of pathological speech signal analysis. 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. Here the term neuromechanical is summarizing the dynamic model of the biological structure biomechanical in considering muscles, tissues, forces and velocities as well as the neuromotor spiking activity on the neuromotor pathways involved in the processes of speech production.

Speech Communication,55 2 The zero degrees of the reference angle correspond to the horizontal movement of the reference point.

Through this study only the subsystems 3 and 4 are to be considered regarding speech characterization in relation to PD neurodegeneration. It must be said that tremor in harmonics and formants need not be correlated as they depend on different neuromotor pathways, rel being controlled by laryngeal nerves vaguswhereas articulation depends mainly on jaw, lingual and facial nerves branches of trigeminaland PD may affect both systems differently. These model sets were used to estimate the accumulated D KL of each PD patient of both genders against their respective model set, as.

It may be seen that horizontal and vertical velocities behave quite differently than in the normative case. The tongue T is supported by the lower jaw and hyoid bone as neiromotor as other facial tissues associated.

control neuromotor del habla pdf free

This underlying fact may be behind gender skew. Therefore, hypo- hyper- or unstable muscle tone are markers of possible PD neurodegeneration, and these can be traced from speech. The phonation and articulation systems are governed by specific neuromotor units activated from the bulbar structures in the midbrain 1which control the retraction of the velopharyngeal switch in nasalization 2activate tongue movements up, down, back and forth 3: Reliable estimates for these scale factors may be obtained from diphthong articulations involving changes in the positions of the reference point which show a fast and steady change.


Brain, 4 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.

The first observation from the results presented is that the male set presents better correlation between D KL and CS than the female one. Linear regression lines have been drawn and formulated for comparison purposes.

control neuromotor del habla pdf merge

Formant kinematics PD patient. Tremor and articulation instability can be clearly appreciated in this case, both in harmonics and in formants.

At this point, it will become clear that the AKV probability density function may be a good candidate marker to establish differentiation between stable and unstable articulation due to PD. Spectrogram of an utterance with the havla vowels [a: A neuromechanical model of the jaw-tongue seems to be efficient in providing a kinematic description of speech from acoustic correlates as formants.

Monitoring Parkinson Disease from speech articulation kinematics | Gómez | Loquens

The feedback is modulated in short and long loops, depending on the role played deo the cerebelum and other structures processing the flow from sensory units in the peripherical muscles. A control model of human tongue movements in speech. The AKV is given in cm.

Biological Cybernetics, 77 1 The field of speech analysis for biomedical applications is of great interest, and it opens new and exciting research lines to speech scientists. A statistical distribution of the kinematic velocity of the lower jaw and tongue is introduced, which presents interesting properties regarding pattern recognition and classification.

Parkinson Disease PD is a neuromotor illness affecting general movements of different muscles, those haabla in speech production being among them. It is multidisciplinary and complex, therefore cooperation among large research habbla including linguists, speech therapists, information processing experts, neurologists, psychologists, etc.

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Journal of Voice, 11 3 A global composite score CS hablaa been used neuromohor represent the set of objective scores in a single value as:. This means that sensor neurons in the activated muscles must send information back to the midbrain in order to adjust the ongoing neuromotor flow to muscles for finely tunning the muscular forces exerted on the biomechanical structures of the jaw-tongue system.


No matter how well designed they may be or well-trained raters are, a human subjective factor is implicit and difficult to be removed. Speech articulation is also a possible target to explore.

This is 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 fel a female population.

Loquens, 4 1e Recordings of long neuromotof vowels were selected and processed to obtain the first two formants, and the respective distributions of their AKV were estimated as referred before. Regarding the biomechanical model, the jaw J is fixed to the skull bone at fulcrum F as in a third-class lever system. Acoustical analysis of vocal tremor in Parkinson speakers.

Renewal of the Neurophysiology of Language: It is expected that in the next years to come neurodegenerative diseases will be monitored by speech as a daily routine Cecchi, A possible description of the neuromotor activity from speech can be given in terms of the dynamic changes experimented by the resonant frequencies of the vocal tract, which are known classically as formants.

The structure of the present paper is as follows: The association between articulation gestures open—close and back—front positions summarizes in a simple way what researchers have established formally Sanguineti et al.

Taking into account that the AKV is a correlate of the horizontal and vertical movement speed of the jaw-tongue reference point, the kinematic behavior of the utterance is coded in its probability density function, evaluated from a histogram of counts, as follows:. In the case of PD patients uttering sustained vowels or sequences of vowels, the activity in R2, R3 and R4 is expected controol be larger than in controls.

Neurological, Functional, and Laryngeal Diseases. This is equivalent to considering that w 11 and w 22 will be negligible compared to w 12 and w Monitoring Parkinson Disease from speech articulation kinematics.


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