Dynamic Aspects of Phonatory Control in Spasmodic Dysphonia

1987 ◽  
Vol 30 (2) ◽  
pp. 197-206 ◽  
Author(s):  
Christy L. Ludlow ◽  
Nadine P. Connor
Keyword(s):  
Vocal Fold ◽  
Reaction Times ◽  
Movement Control ◽  
Reaction Time Task ◽  
Spasmodic Dysphonia ◽  
Maximum Phonation Time ◽  
Precise Control ◽  
Time Frequency ◽  
Intensity Control ◽  
Normal Controls

To understand the voluntary laryngeal movement disorder in spasmodic dysphonia (SD), SD patients were compared with normal controls on speech tasks with different laryngeal motor-control demands. Nine patients with idiopathic chronic SD and no other speech, otolaryngologic, neurologic, or psychiatric disorders were compared with 15 control subjects who were free of such disorders. Speech production tasks required different degrees of dynamic and precise control of vocal fold movement. Phonatory off times were increased in the SD patients, while maximum phonation time, phonatory on time, frequency and intensity control, and reaction times for CV syllables were not affected. On a reaction-time task, the onset of laryngeal movement was not delayed in the SD patients, however, the time between the onset of laryngeal movement and phonatory onset was significantly increased in the SD patients in comparison with the controls. Therefore, SD patients had no difficulty with the onset of laryngeal movement but were slow to achieve phonation, indicating a movement-control disorder affecting vocal fold adduction for phonation onset.

Modeling Within-Person Variance in Reaction Time Data of Older Adults

GeroPsych ◽  
2011 ◽  
Vol 24 (4) ◽  
pp. 169-176 ◽  
Author(s):  
Philippe Rast ◽  
Daniel Zimprich
Keyword(s):  
Reaction Time ◽  
Cognitive Aging ◽  
Reaction Times ◽  
Reaction Time Task ◽  
Reaction Time Data ◽  
Scale Model ◽  
Time Data ◽  
Time Task ◽  
The Mean ◽  
Second Wave

In order to model within-person (WP) variance in a reaction time task, we applied a mixed location scale model using 335 participants from the second wave of the Zurich Longitudinal Study on Cognitive Aging. The age of the respondents and the performance in another reaction time task were used to explain individual differences in the WP variance. To account for larger variances due to slower reaction times, we also used the average of the predicted individual reaction time (RT) as a predictor for the WP variability. Here, the WP variability was a function of the mean. At the same time, older participants were more variable and those with better performance in another RT task were more consistent in their responses.

scholarly journals Manipulations of the Response-Stimulus Intervals as a Factor Inducing Controlled Amount of Reaction Time Intra-Individual Variability

2021 ◽  
Vol 11 (5) ◽  
pp. 669
Author(s):  
Paweł Krukow ◽  
Małgorzata Plechawska-Wójcik ◽  
Arkadiusz Podkowiński
Keyword(s):  
Reaction Time ◽  
Simple Reaction Time ◽  
Reaction Times ◽  
Reaction Time Task ◽  
Assessment Method ◽  
Individual Variability ◽  
Simple Reaction Time Task ◽  
Stimulus Interval ◽  
Simple Reaction ◽  
Response Stimulus

Aggrandized fluctuations in the series of reaction times (RTs) are a very sensitive marker of neurocognitive disorders present in neuropsychiatric populations, pathological ageing and in patients with acquired brain injury. Even though it was documented that processing inconsistency founds a background of higher-order cognitive functions disturbances, there is a vast heterogeneity regarding types of task used to compute RT-related variability, which impedes determining the relationship between elementary and more complex cognitive processes. Considering the above, our goal was to develop a relatively new assessment method based on a simple reaction time paradigm, conducive to eliciting a controlled range of intra-individual variability. It was hypothesized that performance variability might be induced by manipulation of response-stimulus interval’s length and regularity. In order to verify this hypothesis, a group of 107 healthy students was tested using a series of digitalized tasks and their results were analyzed using parametric and ex-Gaussian statistics of RTs distributional markers. In general, these analyses proved that intra-individual variability might be evoked by a given type of response-stimulus interval manipulation even when it is applied to the simple reaction time task. Collected outcomes were discussed with reference to neuroscientific concepts of attentional resources and functional neural networks.

scholarly journals Lateralization of attention in adults with ADHD: Evidence of pseudoneglect

2020 ◽  
Vol 63 (1) ◽  
Author(s):  
Bartosz Helfer ◽  
Stefanos Maltezos ◽  
Elizabeth Liddle ◽  
Jonna Kuntsi ◽  
Philip Asherson
Keyword(s):  
Reaction Time ◽  
Visual Field ◽  
Reaction Times ◽  
Study Participant ◽  
Reaction Time Task ◽  
Right Visual Field ◽  
Time Variability ◽  
Incentive Condition ◽  
Reaction Time Variability ◽  
The Right

Abstract Background. We investigated whether adults with attention-deficit/hyperactivity disorder (ADHD) show pseudoneglect—preferential allocation of attention to the left visual field (LVF) and a resulting slowing of mean reaction times (MRTs) in the right visual field (RVF), characteristic of neurotypical (NT) individuals —and whether lateralization of attention is modulated by presentation speed and incentives. Method. Fast Task, a four-choice reaction-time task where stimuli were presented in LVF or RVF, was used to investigate differences in MRT and reaction time variability (RTV) in adults with ADHD (n = 43) and NT adults (n = 46) between a slow/no-incentive and fast/incentive condition. In the lateralization analyses, pseudoneglect was assessed based on MRT, which was calculated separately for the LVF and RVF for each condition and each study participant. Results. Adults with ADHD had overall slower MRT and increased RTV relative to NT. MRT and RTV improved under the fast/incentive condition. Both groups showed RVF-slowing with no between-group or between-conditions differences in RVF-slowing. Conclusion. Adults with ADHD exhibited pseudoneglect, a NT pattern of lateralization of attention, which was not attenuated by presentation speed and incentives.

Cross-Innervation of the Thyroarytenoid Muscle by a Branch from the External Division of the Superior Laryngeal Nerve

1997 ◽  
Vol 106 (7) ◽  
pp. 594-598 ◽  
Author(s):  
Sina Nasri ◽  
Joel A. Sercarz ◽  
Pouneh Beizai ◽  
Young-Mo Kim ◽  
Ming Ye ◽  
...  
Keyword(s):  
Vocal Fold ◽  
Superior Laryngeal Nerve ◽  
Laryngeal Nerve ◽  
Spasmodic Dysphonia ◽  
Clinical Implications ◽  
Motor Innervation ◽  
Vocal Fold Vibration ◽  
Adductor Spasmodic Dysphonia ◽  
Thyroarytenoid Muscle ◽  
Stimulation Of

The neuroanatomy of the larynx was explored in seven dogs to assess whether there is motor innervation to the thyroarytenoid (TA) muscle from the external division of the superior laryngeal nerve (ExSLN). In 3 animals, such innervation was identified. Electrical stimulation of microelectrodes applied to the ExSLN resulted in contraction of the TA muscle, indicating that this nerve is motor in function. This was confirmed by electromyographic recordings from the TA muscle. Videolaryngostroboscopy revealed improvement in vocal fold vibration following stimulation of the ExSLN compared to without it. Previously, the TA muscle was thought to be innervated solely by the recurrent laryngeal nerve. This additional pathway from the ExSLN to the TA muscle may have important clinical implications in the treatment of neurologic laryngeal disorders such as adductor spasmodic dysphonia.

Laryngeal Framework Surgery in the Management of Spasmodic Dysphonia

1989 ◽  
Vol 98 (1) ◽  
pp. 52-54 ◽  
Author(s):  
Harvey M. Tucker
Keyword(s):  
Vocal Fold ◽  
Vocal Folds ◽  
Long Term Results ◽  
Spasmodic Dysphonia ◽  
Management Problem ◽  
Cure Rate ◽  
Adductor Spasmodic Dysphonia ◽  
Laryngeal Framework Surgery ◽  
Selective Lysis

Spasmodic dysphonia continues to be a management problem for otolaryngologists. Selective lysis of the recurrent laryngeal nerve has been useful in the management of this disease. Reported long-term results, however, reveal that spasm recurs in approximately 40% to 50% of initially successful patients in spite of persistence of the unilateral vocal fold paralysis. Although some of these failures can be recaptured with subsequent laser surgery, the overall “cure” rate does not exceed 70%, even in the best hands. The contributions of Isshiki, LeJeune, and Tucker have demonstrated that tension in the vocal folds can be adjusted by laryngeal framework surgery. Experience with 16 patients suffering from adductor spasmodic dysphonia suggests that laryngeal framework surgery is useful in the management of this disorder.

Finger-Movement Tracking Scores in Healthy Subjects

1994 ◽  
Vol 79 (1) ◽  
pp. 563-576 ◽  
Author(s):  
James R. Carey ◽  
Connie L. Bogard ◽  
Bradley A. King ◽  
Vera J. Suman
Keyword(s):  
Index Finger ◽  
Early Recognition ◽  
Movement Control ◽  
Hand Preference ◽  
Metacarpophalangeal Joint ◽  
Sine Wave ◽  
Precise Control ◽  
Nonpreferred Hand ◽  
Older Subjects ◽  
Movement Tracking

The purpose of this study was to examine the effects of age, sex, and hand preference on precise control of voluntary movement at the index finger metacarpophalangeal joint in able-bodied volunteers. An electrogoniometer was attached to this joint and connected to a computer. The computer screen displayed a sine wave target that each subject attempted to track with careful extension and flexion finger movements. Accuracy index scores were calculated for the extension phases, flexion phases, and the total sine wave. Each subject performed three tracking trials and the average for each of the above scores was computed. The results showed that younger subjects tracked significantly more accurately than older subjects and men tracked significantly more accurately than women. Also, the subjects tracking with the nonpreferred hand (15 right, 105 left) tracked significantly more accurately than those subjects tracking with the preferred hand (112 right, 8 left) in the flexion phases of the test. The data from these able-bodied subjects provide a base for comparison of patients' data, which may be helpful in the early recognition and monitoring of problems with precision in movement control.

A Continuous-Flow Model for Phonatory Reaction Time

1991 ◽  
Vol 34 (3) ◽  
pp. 517-525 ◽  
Author(s):  
Carole Ferrand ◽  
Gordon W. Blood ◽  
Harvey R. Gilbert
Keyword(s):  
Reaction Time ◽  
Continuous Flow ◽  
Vocal Fold ◽  
Flow Model ◽  
Reaction Time Task ◽  
Central Process ◽  
Brain Potentials ◽  
Time Task ◽  
Vocal Fold Vibration ◽  
Yield Information

The purpose of this study was to validate a proposed continuous-flow model of phonatory reaction time by investigating the temporal order of selected laryngeal and neurophysiological events involved in a phonatory reaction time task. Ten normal speakers participated in a phonatory reaction time task. Laryngeal positioning movements prior to vocal fold closure (laryngeal shift) and onset of vocal fold vibration (acoustic onset) were recorded with an electroglottograph. P300 brain potentials were collected simultaneously, and they served as an index of a central process underlying reaction time. The obtained temporal ordering of laryngeal shift, P300, and acoustic onset supported a continuous-flow model of phonatory reaction time. Use of this model might yield information that is more accurate in explaining physiological function and more precise in describing temporal patterning than the serial model.

scholarly journals Functional results of endoscopic arytenoid abduction lateropexy for bilateral vocal fold palsy

2021 ◽  
Author(s):  
László Rovó ◽  
Vera Matievics ◽  
Balázs Sztanó ◽  
László Szakács ◽  
Dóra Pálinkó ◽  
...  
Keyword(s):  
Vocal Fold ◽  
Voice Quality ◽  
Functional Results ◽  
Severity Index ◽  
Invasive Treatment ◽  
Maximum Phonation Time ◽  
Motion Recovery ◽  
Bilateral Vocal Fold Paralysis ◽  
Vocal Fold Palsy ◽  
False Vocal

Abstract Purpose Endoscopic arytenoid abduction lateropexy (EAAL) is a reliable surgical solution for the minimally invasive treatment of bilateral vocal fold palsy (BVFP), providing a stable airway by the lateralization of the arytenoid cartilages with a simple suture. The nondestructive manner of the intervention theoretically leads to higher regeneration potential, thus better voice quality. The study aimed to investigate the respiratory and phonatory outcomes of this treatment concept. Methods 61 BVFP patients with significant dyspnea associated with thyroid/parathyroid surgery were treated by unilateral EAAL. Jitter, Shimmer, Harmonics to Noise Ratio, Maximum Phonation Time, Fundamental frequency, Voice Handicap Index, Dysphonia Severity Index, Friedrich’s Dysphonia Index, Global-Roughness-Breathiness scale, Quality of Life, and Peak Inspiratory Flow were evaluated 18 months after EAAL. Results All patients had a stable and adequate airway during the follow-up. Ten patients (16.4%) experienced complete bilateral motion recovery with objective acoustic parameters in the physiological ranges. Most functional results of the 13 patients (21.3%) with unilateral recovery also reached the normal values. Fifteen patients (24.6%) had unilateral adduction recovery only, with slightly impaired voice quality. Eleven patients (18.0%) had false vocal fold phonation with socially acceptable voice. In 12 patients (19.7%) no significant motion recovery was detected on the glottic level. Conclusion EAAL does not interfere with the potential regeneration process and meets the most important phoniatric requirements while guaranteeing the reversibility of the procedure—therefore serving patients with transient palsy. Further, a socially acceptable voice quality and an adequate airway are ensured even in cases of permanent bilateral vocal fold paralysis.

Semantic memory is both impaired and anomalous in schizophrenia

1994 ◽  
Vol 24 (1) ◽  
pp. 193-202 ◽  
Author(s):  
E. Y. H. Chen ◽  
A. J. Wilkins ◽  
P. J. McKenna
Keyword(s):  
Reaction Time ◽  
Semantic Memory ◽  
Reaction Time Task ◽  
Semantic Category ◽  
Semantic Relationship ◽  
Conceptual Category ◽  
Ambiguous Words ◽  
Schizophrenic Patients ◽  
Speed And Accuracy ◽  
Normal Controls

SynopsisThe integrity of semantic memory in schizophrenia was examined in a reaction time task requiring subjects to verify words as members or non-members of a conceptual category, where the words differed in their degree of semantic relationship to the category. Compared to matched normal controls, 28 schizophrenic patients were impaired on the task, showing slower responses in all conditions. In addition, their performance was anomalous in that they took longest to respond to items that were outside the category but semantically related to it, in contrast to the controls who took the longest to respond to ambiguous words at the borderline of the category. The pattern of ‘yes’ and ‘no’ responses of the patients was anomalous in a similar way. In both speed and accuracy of responding, the findings indicate that there is an outward shift of semantic category boundaries in schizophrenia.

scholarly journals Neuronal Correlates of Post-Error Slowing in the Rat Dorsomedial Prefrontal Cortex

2008 ◽  
Vol 100 (1) ◽  
pp. 520-525 ◽  
Author(s):  
Nandakumar S. Narayanan ◽  
Mark Laubach
Keyword(s):  
Prefrontal Cortex ◽  
Task Performance ◽  
Simple Reaction Time ◽  
Reaction Times ◽  
Reaction Time Task ◽  
Delay Period ◽  
Cortical Region ◽  
Simple Reaction Time Task ◽  
Unit Recording ◽  
Dorsomedial Prefrontal Cortex

Rats with impaired function in dorsomedial regions of the prefrontal cortex (dmPFC) are unable to maintain a behavioral response over a delay period. Here we report that neurons in this cortical region are prominently modulated after errors in a tone-cued, simple reaction time task and that inactivation of dmPFC attenuates a slowing of reaction times that is observed following errors. Using methods for chronic single-unit recording, we found that approximately one-third of dmPFC neurons were modulated after errors, and 28% of these neurons had increased posterror firing that persisted into the delay period of the following trial. In contrast to dmPFC, no such neurons were found in motor cortex. Our results implicate the dorsomedial prefrontal cortex in a form of retrospective working memory that improves task performance following errors.

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