A Comparative Investigation of the Laryngeal Premotor, Adjustment, and Reaction Times of Stutterers and Nonstutterers

1989 ◽  
Vol 32 (2) ◽  
pp. 239-244 ◽  
Author(s):  
Klaas Bakker ◽  
Gene J. Brutten
Keyword(s):  
Reaction Times ◽  
Comparative Investigation ◽  
Sensory Stimulus ◽  
Stimulus Modality ◽  
Stimulus Order ◽  
Adjustment Time ◽  
Time Periods ◽  
Group 2

The laryngeal premotor, adjustment, and reaction times of 24 stutterers and 24 nonstutterers were assessed by means of a group (2) by stimulus modality (3) by stimulus order (6) factorial investigation. The laryngeal measures were determined from print outs made from electroglottographic recordings taken during the production of [] that was cued by a visual, auditory, or somato-sensory stimulus. The results revealed that the laryngeal reaction times of stutterers were significantly longer than those of the nonstutterers. Moreover, the reaction times were significantly longer both during the laryngeal premotor and adjustment time periods. The observed between-group difference for each of these laryngeal measures was independent of the stimulus that was employed.

scholarly journals Sealing ability of two commonly used root canal sealers with and with out smear layer

2014 ◽  
Vol 2 (4) ◽  
pp. 327
Author(s):  
Nazish Fatima ◽  
Mehwish Hussain
Keyword(s):  
Smear Layer ◽  
Repeated Measure ◽  
Time Interval ◽  
Sealing Ability ◽  
Nail Polish ◽  
Ah Plus ◽  
Time Periods ◽  
Group 2 ◽  
Crown Roots ◽  
Group 1

AIM: The aim of current research was to find out the sealing ability of two commonly used sealers in the presence and absence of smear layer at different time interval. MATERIAL AND METHODS: Total of 180 single rooted vital teeth were used. Transversal section was made with the help of digital slow speed cutting saw to divide the root and crown part. After removal of crown roots part was instrumented and prepared. The 180 teeth were randomly divided into two equal groups (n=90) 1 and 2. In group 1 the smear layer was kept intact but it was removed from group 2 with EDTA (17%). Group 1 was then divided into two sub-groups, A1, A2. Group 2 was again separated into two sub-groups, B1 and B2. Each sub-group contained of 45 samples. In sub-groups A1 and B1, AH Plus sealer, in sub-groups A2 and B2, Ketac-endo sealer and cold lateral condensation technique was used for obturation with gutta percha. All samples were kept in an incubator at 37°C for 24 hours, with help of nail polish/varnish all samples root surfaces was painted only excluding apical area after words each sub group were further divided in to three groups of 15 to represent immersion periods of 7,15 and 30 days. All samples were then kept in 5 % methylene blue dye solution at 37o c for their respective time periods. After specific time period, the roots of every group were cut longitudinally and evaluate under a stereomicroscopes to evaluate apical micro leakage in millimeter. Data was subjected to Repeated measure ANOVA with post-hoc analysis using Tukey and bonferroni tests. RESULTS: Overall analysis indicated significant reduction in sealing ability canals in with and without smear layer over different time periods (p <0.0001). CONCLUSION: Current study has concluded that AH plus sealer provides significantly better seal in the absence of smear layer than in the presence of smear layer in addition it gave better seal than Ketac-Endo sealer in the absence and presence of smear layer.

Identification and genetic characterisation of Giardia and Cryptosporidium strains in humans and dairy cattle in the Waikato Region of New Zealand

2003 ◽  
Vol 47 (3) ◽  
pp. 21-26 ◽  
Author(s):  
J.J. Learmonth ◽  
G. Ionas ◽  
A.B. Pita ◽  
R.S. Cowie
Keyword(s):  
New Zealand ◽  
Dairy Cattle ◽  
Cryptosporidium Parvum ◽  
Late Summer ◽  
Phylogenetic Group ◽  
Summer Period ◽  
Faecal Samples ◽  
Time Periods ◽  
Group 2 ◽  
Group 1

Giardia intestinalis and Cryptosporidium parvum are commonly acquired waterborne parasites but little is known about their transmission cycles with regard to humans and animals. Faecal samples were collected over two time periods within the Waikato region of New Zealand from dairy cattle and humans and all positive isolates were genotyped. Of the 724 faecal specimens examined (354 cows, 304 calves and 66 humans), 16 cows, 32 calves and 5 humans were positive for G. intestinalis. Phylogenetic group 1 was found in 26 G. intestinalis positive dairy cattle with 22 being group 2. One G. intestinalis positive human isolate was group 1 and four were group 2. Of the 724 faecal specimens examined two cows, 33 calves and 66 human specimens were positive for C. parvum. All 35 C. parvum positive dairy cattle exhibited the bovine genotype while the 66 positive humans showed a seasonal shift in the prevalent genotype with the bovine dominating the spring (100%) and the human dominating the late summer period (96%).

scholarly journals Temporal Unfolding of Micro-valences in Facial Expression Evoked by Visual, Auditory, and Olfactory Stimuli

2020 ◽  
Vol 1 (4) ◽  
pp. 208-224
Author(s):  
Kornelia Gentsch ◽  
Ursula Beermann ◽  
Lingdan Wu ◽  
Stéphanie Trznadel ◽  
Klaus R. Scherer
Keyword(s):  
Facial Expression ◽  
Muscle Activity ◽  
Social Judgment ◽  
Judgment Task ◽  
Sensory Stimulus ◽  
Response Patterns ◽  
Facial Muscle ◽  
Stimulus Modality ◽  
Appraisal Process ◽  
Olfactory Stimuli

AbstractAppraisal theories suggest that valence appraisal should be differentiated into micro-valences, such as intrinsic pleasantness and goal-/need-related appraisals. In contrast to a macro-valence approach, this dissociation explains, among other things, the emergence of mixed or blended emotions. Here, we extend earlier research that showed that these valence types can be empirically dissociated. We examine the timing and the response patterns of these two micro-valences via measuring facial muscle activity changes (electromyography, EMG) over the brow and the cheek regions. In addition, we explore the effects of the sensory stimulus modality (vision, audition, and olfaction) on these patterns. The two micro-valences were manipulated in a social judgment task: first, intrinsic un/pleasantness (IP) was manipulated by exposing participants to appropriate stimuli presented in different sensory domains followed by a goal conduciveness/obstruction (GC) manipulation consisting of feedback on participants’ judgments that were congruent or incongruent with their task-related goal. The results show significantly different EMG responses and timing patterns for both types of micro-valence, confirming the prediction that they are independent, consecutive parts of the appraisal process. Moreover, the lack of interaction effects with the sensory stimulus modality suggests high generalizability of the underlying appraisal mechanisms across different perception channels.

scholarly journals Effect of Different Time Periods of Vital Bleaching on Flexural Strength of Bovine Enamel and Dentin Complex

2007 ◽  
Vol 8 (3) ◽  
pp. 21-28 ◽  
Author(s):  
Marjaneh Ghavamnasiri ◽  
Sara Abedini LNU ◽  
Alireza Mahdizadeh Tazangi
Keyword(s):  
Flexural Strength ◽  
Artificial Saliva ◽  
Testing Machine ◽  
Control Group ◽  
Mean Values ◽  
Significant Difference ◽  
Time Periods ◽  
Group 2 ◽  
Bovine Enamel

Abstract Aim The aim of this in vitro study was to evaluate the effect of 20% carbamide peroxide (CP) on the flexural strength (FS) of bovine enamel and dentin complex. Methods and Materials One hundred sound bovine teeth were selected for use. Blocks (2×3×8 mm) from the middle portion of the facial surfaces of each crown were sectioned from the teeth. The specimens were randomly divided into five groups (n=20) based on the time period of vital bleaching. Group 1 comprised the control group kept in artificial saliva. The experimental groups subjected to immersion in 20% CP, Opalescence, for four, six and eight weeks, respectively (eight hours daily). Mechanical testing was performed 24 hours after the last treatment using an Instron Universal Testing Machine with a crosshead speed of 0.5 mm/min. The results were analyzed by one-way analysis of variance (ANOVA) and Tukey's test (α=0.05). Results Mean values for FS were 141.27, 103.06, 120.71, 130.23, and 117.90 (Mpa), respectively. Statistically significant differences in FS were noted among the groups. A statistically significant difference was observed between Group 2 (two week bleach) and the control. Conclusion Application of 20% CP bleach for two weeks provided significant decreases in FS of bovine enamel and dentin complex. Similar decreases were not observed among the other groups. Citation Ghavamnasiri M, Abedini S, Tazangi AM. Effect of Different Time Periods of Vital Bleaching on Flexural Strength of Bovine Enamel and Dentin Complex. J Contemp Dent Pract 2007 March;(8)3:021-028.

scholarly journals Temporal lung changes on thin-section CT in patients with COVID-19 pneumonia

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Zhiyan Zhang ◽  
Runhui Tang ◽  
Heyang Sun ◽  
Haiyang Dai ◽  
Kangyin Chen ◽  
...  
Keyword(s):  
Thin Section ◽  
Chest Ct ◽  
Illness Onset ◽  
Group 4 ◽  
Lung Abnormalities ◽  
Group 3 ◽  
Time Periods ◽  
Group 2 ◽  
Discharge From Hospital

AbstractWe examined characteristics of chest CT across different time periods for patients with COVID-19 pneumonia in Huizhou, China. This study included 56 COVID-19 patients with abnormal CT acquired between January 22 and March 3, 2020. The 141 scans of 56 patients were classified into four groups (Groups 1–4) based on dates on which scans were obtained at the 1st, 2nd, 3rd week or longer than three weeks after illness onset. Forty-five patients with follow-up scans were categorized into four groups (Groups A–D) according to extent that lesions reduced (≥ 75%, 50–75%, 25–50% and < 25%). Ground-glass opacities (GGO) was prevalent in Groups 1–4 (58.1–82.6%), while percentages of consolidation ranged between 9.7% in Group 4 and 26.2% in Group 2. The highest frequency of fibrous stripes occurred in Group 3 (46.7%). Total CT scores were on average higher in Groups 2–3. Among 45 follow-up patients, 11 (24.4%) of them recovered with lesions reducing ≥ 75%, with the lowest median age and total CT scores on admission. There are temporal patterns of lung abnormalities in COVID-19 patients, with higher extent of lesion involvement occurring in the 2nd and 3rd week. Persisting lung changes indicate some patients may need isolation after discharge from hospital.

Effect of Duration of Chronic Peritoneal Dialysis Therapy on the Development of Peritonitis

1999 ◽  
Vol 19 (4) ◽  
pp. 376-379 ◽  
Author(s):  
Laura Troidle ◽  
Nancy Gorban–Brennan ◽  
Alan S. Kliger ◽  
Fredric O. Finkelstein
Keyword(s):  
Peritoneal Dialysis ◽  
Morphological Changes ◽  
Chronic Peritoneal Dialysis ◽  
Gram Positive ◽  
Gram Negative ◽  
Group 3 ◽  
Time Periods ◽  
Group 2 ◽  
Artery Disease ◽  
Group 1

Objective Long-term chronic peritoneal dialysis (CPD) therapy has been associated with alterations in peritoneal membrane structure and peritoneal macrophage function. We thus reviewed our experience with the development of peritonitis among patients maintained on CPD therapy for various time periods to determine if the spectrum of organisms, rates of peritonitis, and outcome changed with the duration of CPD therapy. Setting and Patients Patients maintained on CPD therapy in our out-patient unit in New Haven, Connecticut. Design Retrospective review of the charts of patients maintained on CPD therapy (HomeChoice Cycler or Ultrabag, Baxter, McGaw Park, IL, U.S.A.) between 1 January 1997 and 31 March 1998. These patients were divided into three groups: group 1, patients maintained on CPD therapy < 12 months; group 2, patients maintained on CPD therapy for 13 - 36 months; and group 3, patients maintained on CPD therapy for ≥ 37 months. Results The study included 256 patients: 101 patients in group 1, 110 patients in group 2, and 45 patients in group 3. All groups of patients were similar in age. There were significantly fewer Caucasians and fewer males in group 3 in comparison to groups 1 and 2. The incidence of diabetes mellitus, coronary artery disease, and peripheral vascular disease was significantly lower among patients in group 3 in comparison to groups 1 and 2. There were 155 episodes of peritonitis during the study period for an overall rate of 1 episode in 18.7 patient-months. The overall, gram-positive, and gram-negative rates of peritonitis were not significantly different among the patients in groups 1, 2, and 3. There were more episodes of Staphylococcus aureus peritonitis among patients in group 3 in comparison to group 2 (1 episode in 59.6 vs 1 episode in 280.2 patient-months, respectively). Two weeks after the development of peritonitis, 94.6% of the patients in group 3 continued CPD therapy, while 79.4% of the patients in group 1 continued CPD therapy ( p < 0.05). No patient in group 3 transferred to hemodialysis, while 10.3% and 8.2% of the patients in groups 1 and 2 transferred to hemodialysis ( p < 0.05). The death rate 2 weeks after the onset of peritonitis was 10.3%, 9.8%, and 5.4% in groups 1, 2, and 3, respectively ( p = NS). Conclusions Despite the immunological and morphological changes that occur in the peritoneal cavity with increased time on CPD therapy, there was no difference in the overall, gram-positive, or gram-negative rates of peritonitis for patients maintained on CPD therapy for various time periods. Patients in group 3 continued CPD therapy more often than did patients in group 1. Patients in group 3 transferred to hemodialysis less often than did the remaining patients in the study period. The incidence of death was not significantly different for the three groups of patients.

scholarly journals Incidence and Survival of Patients with Small Intestinal Neuroendocrine Tumours in a Danish NET Center

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Lise Brehm Hoej ◽  
Karen Marie Nykjær ◽  
Henning Gronbaek
Keyword(s):  
Neuroendocrine Tumours ◽  
Clinical Symptoms ◽  
Treatment Modalities ◽  
Period 2 ◽  
Time Period ◽  
Promising Treatment ◽  
Time Periods ◽  
Small Intestinal ◽  
Group 2 ◽  
Group 1

Introduction. Small intestinal neuroendocrine tumours (NETs) have increased in incidence during the past decades. In recent years, new promising treatment modalities have been introduced. The aim of the present study was to characterize and compare patients with small intestinal NET seen in the periods 1994–2003 (group 1) and 2004–2011 (group 2) to demonstrate changes in incidence and survival in the two time periods.Patients and Methods. There were 52 NET patients in group 1 and 109 patients in group 2.Results. The incidence of small intestinal NET was 0.3/100.000/year in period 1 and 0.7/100.000/year in period 2. There was no difference in median chromogranin A levels (8709 versus 2381 pmol/L,P=0.107), presence of liver metastases (56% versus 44%), clinical symptoms (flushing/diarrhea), or Ki67 index (2% versus 2%), between the two time periods. The 5-year survival rate in the two time periods was similar, 64.7%, and 77.0%, respectively, (P=0.23).Conclusion. We observed an increase in the incidence of small intestinal NET during the period from January 1994 to December 2011, but we were not able to demonstrate an improved survival during the same time period.

Speech-Related Reaction Times of Stutterers and Nonstutterers

1990 ◽  
Vol 55 (2) ◽  
pp. 295-299 ◽  
Author(s):  
Klaas Bakker ◽  
Gene J. Brutten
Keyword(s):  
Factor Analysis ◽  
Reaction Time ◽  
Oral Reading ◽  
Voice Onset Time ◽  
Reaction Times ◽  
Onset Time ◽  
Discriminative Power ◽  
Diagnostic Measures ◽  
Adjustment Time ◽  
Related Reaction

Speech-related reaction time measures (laryngeal premotor and adjustment time for /a/, labial initiation and physiological voice onset time for /pa/) and fluency-related measures (number of stutterings, number of normal disfluencies, and time needed to complete an oral reading) of 24 stutterers and a like number of nonstutterers were assessed to determine their diagnostic discriminative power. Discriminant analysis showed that stutterers were most effectively differentiated from normally fluent speakers by the total number of stutterings and normal disfluencies during oral reading and by the duration of laryngeal adjustments prior to cued phonation. Factor analysis revealed that the fluency failure and reaction time measures clustered independently for both stutterers and nonstutterers. These findings suggest that both fluency failures and the duration of laryngeal adjustment time are useful diagnostic measures for discriminating stutterers from those who are normally fluent.

scholarly journals Recurrent processes support a cascade of hierarchical decisions

eLife ◽  
2020 ◽  
Vol 9 ◽  
Author(s):  
Laura Gwilliams ◽  
Jean-Remi King
Keyword(s):  
Reaction Times ◽  
Extended Time ◽  
Complex Interplay ◽  
Neural Assemblies ◽  
Brain Responses ◽  
Recurrent Processing ◽  
Time Periods ◽  
Subsequent Activity ◽  
Prefrontal Cortices ◽  
Motor Signals

Perception depends on a complex interplay between feedforward and recurrent processing. Yet, while the former has been extensively characterized, the computational organization of the latter remains largely unknown. Here, we use magneto-encephalography to localize, track and decode the feedforward and recurrent processes of reading, as elicited by letters and digits whose level of ambiguity was parametrically manipulated. We first confirm that a feedforward response propagates through the ventral and dorsal pathways within the first 200 ms. The subsequent activity is distributed across temporal, parietal and prefrontal cortices, which sequentially generate five levels of representations culminating in action-specific motor signals. Our decoding analyses reveal that both the content and the timing of these brain responses are best explained by a hierarchy of recurrent neural assemblies, which both maintain and broadcast increasingly rich representations. Together, these results show how recurrent processes generate, over extended time periods, a cascade of decisions that ultimately accounts for subjects’ perceptual reports and reaction times.

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