scholarly journals Exploring the Gaze Behavior of Tennis Players with Different Skill Levels When Receiving Serves through Eye Movement Information

2021 ◽  
Vol 11 (19) ◽  
pp. 8794
Author(s):  
Yen-Nan Lin ◽  
Jun Wang ◽  
Yu Su ◽  
I-Lin Wang
Keyword(s):  
Eye Movement ◽  
Contact Area ◽  
Eye Gaze ◽  
Gaze Behavior ◽  
Skill Levels ◽  
Tennis Players ◽  
The Gaze ◽  
Ball Contact ◽  
Group A ◽  
Group B

Background: The purpose of this study was to explore the gaze behavior of tennis players with different skill levels when receiving serves through eye movement information. Methods: The skill level was divided into group A (experts, with more than 10 years of playing experience) and group B (novices, with less than 2 years of playing experience). We compared the differences in gaze behavior between groups A and B at the head-shoulder, trunk-hips, arm-hand, leg-foot, racket, ball, and racket-ball contact area seven positions using the Eye-gaze Response Interface Computer Aid (ERICA) device. Data were analyzed using two-way ANOVA. Results: Compared with the novices, the experts have more gaze time in the head–shoulders, rack, and ball when serving forehand (p < 0.01). The experts also have more gaze time on the head–shoulders, trunk–hips, racket, ball, and racket–ball contact area when serving backhand (p < 0.05). Conclusions: Expert athletes have a longer stare time for a specific position, which mainly determines the direction of the ball. Tennis coaches can increase the gaze time for these four positions and improve tennis players’ ability to predict the direction of the ball.

scholarly journals Saliency-Based Gaze Visualization for Eye Movement Analysis

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5178
Author(s):  
Sangbong Yoo ◽  
Seongmin Jeong ◽  
Seokyeon Kim ◽  
Yun Jang
Keyword(s):  
Eye Movements ◽  
Visual Attention ◽  
Eye Movement ◽  
Visual Stimuli ◽  
Saliency Map ◽  
Gaze Behavior ◽  
The Gaze ◽  
Movement Data ◽  
Visual Clues ◽  
Human Visual Attention

Gaze movement and visual stimuli have been utilized to analyze human visual attention intuitively. Gaze behavior studies mainly show statistical analyses of eye movements and human visual attention. During these analyses, eye movement data and the saliency map are presented to the analysts as separate views or merged views. However, the analysts become frustrated when they need to memorize all of the separate views or when the eye movements obscure the saliency map in the merged views. Therefore, it is not easy to analyze how visual stimuli affect gaze movements since existing techniques focus excessively on the eye movement data. In this paper, we propose a novel visualization technique for analyzing gaze behavior using saliency features as visual clues to express the visual attention of an observer. The visual clues that represent visual attention are analyzed to reveal which saliency features are prominent for the visual stimulus analysis. We visualize the gaze data with the saliency features to interpret the visual attention. We analyze the gaze behavior with the proposed visualization to evaluate that our approach to embedding saliency features within the visualization supports us to understand the visual attention of an observer.

scholarly journals Development of Estimating Equation of Machine Operational Skill by Utilizing Eye Movement Measurement and Analysis of Stress and Fatigue

2013 ◽  
Vol 2013 ◽  
pp. 1-13
Author(s):  
Satoshi Suzuki ◽  
Asato Yoshinari ◽  
Kunihiko Kuronuma
Keyword(s):  
Eye Movement ◽  
Evaluation Method ◽  
Eye Gaze ◽  
Principal Component ◽  
Estimating Equation ◽  
Skill Levels ◽  
Outlier Test ◽  
Machine Operators ◽  
Skill Evaluation ◽  
Human Support

For an establishment of a skill evaluation method for human support systems, development of an estimating equation of the machine operational skill is presented. Factors of the eye movement such as frequency, velocity, and moving distance of saccade were computed using the developed eye gaze measurement system, and the eye movement features were determined from these factors. The estimating equation was derived through an outlier test (to eliminate nonstandard data) and a principal component analysis (to find dominant components). Using a cooperative carrying task (cc-task) simulator, the eye movement and operational data of the machine operators were recorded, and effectiveness of the derived estimating equation was investigated. As a result, it was confirmed that the estimating equation was effective strongly against actual simple skill levels (r=0.56–0.84). In addition, effects of internal condition such as fatigue and stress on the estimating equation were analyzed. Using heart rate (HR) and coefficient of variation of R-R interval (Cvrri). Correlation analysis between these biosignal indexes and the estimating equation of operational skill found that the equation reflected effects of stress and fatigue, although the equation could estimate the skill level adequately.

scholarly journals The Gaze Communications Between Dogs/Cats and Humans: Recent Research Review and Future Directions

2020 ◽  
Vol 11 ◽  
Author(s):  
Hikari Koyasu ◽  
Takefumi Kikusui ◽  
Saho Takagi ◽  
Miho Nagasawa
Keyword(s):  
Eye Gaze ◽  
Bond Formation ◽  
Research Review ◽  
Research Approach ◽  
Human Society ◽  
Gaze Behavior ◽  
Felis Silvestris Catus ◽  
Future Directions ◽  
The Gaze ◽  
Multimodal Interactions

Dogs (Canis familiaris) and cats (Felis silvestris catus) have been domesticated through different processes. Dogs were the first domesticated animals, cooperating with humans by hunting and guarding. In contrast, cats were domesticated as predators of rodents and lived near human habitations when humans began to settle and farm. Although the domestication of dogs followed a different path from that of cats, and they have ancestors of a different nature, both have been broadly integrated into—and profoundly impacted—human society. The coexistence between dogs/cats and humans is based on non-verbal communication. This review focuses on “gaze,” which is an important signal for humans and describes the communicative function of dogs’ and cats’ eye-gaze behavior with humans. We discuss how the function of the gaze goes beyond communication to mutual emotional connection, namely “bond” formation. Finally, we present a research approach to multimodal interactions between dogs/cats and humans that participate in communication and bond formation.

Calcium Phosphate Hybridized with Human Semitendinosus and Gracilis Tendon Grafts

2007 ◽  
Vol 330-332 ◽  
pp. 1117-1120 ◽  
Author(s):  
Shinobu Kobayashi ◽  
Masataka Sakane ◽  
Hirotaka Mutsuzaki ◽  
Hiromi Nakajima ◽  
M. Tanaka ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Contact Area ◽  
Gracilis Tendon ◽  
Rubber Glove ◽  
Soaking Time ◽  
Rubber Sleeve ◽  
Group A ◽  
Tendon Grafts ◽  
Group B ◽  
Total Contact Area

We hybridized calcium phosphate (CaP) with human semitendinosus and gracilis (ST/G) tendon grafts using an alternate soaking process. To evaluate quantitatively and histologically assess the CaP hybridized human ST/G tendon grafts, we classified them into three groups according to their soaking time – number of soaking cycle: 30 sec – 20 cycles (Group A), 1 min – 15 cycles (Group B), 3 min – 5 cycles (Group C). The tendon grafts were divided into three parts: tibial end (TE), femoral end (FE) and intra-articular (IA) portion. TE was secured using the Krackow technique with No. 2 nonabsorbable sutures, and an Endobutton-CL (Smith & Nephew, USA) was passed through the looped FE, as performed clinically. Then, the IA portion was covered with the sleeve of a rubber glove to prevent CaP hybridization. More soaking cycles induced greater deposition of CaP in the tendon grafts when the total soaking time was the same. Covering the IA portion with a rubber sleeve prevented of CaP deposition. A large amount of CaP in TE was deposited because suture holes increased the total contact area with the solutions.

scholarly journals Plantar Pressure and Contact Area Measurement of Foot Abnormalities in Stroke Rehabilitation

2021 ◽  
Vol 11 (9) ◽  
pp. 1213
Author(s):  
Ligia Rusu ◽  
Elvira Paun ◽  
Mihnea Ion Marin ◽  
Jude Hemanth ◽  
Mihai Robert Rusu ◽  
...  
Keyword(s):  
Contact Area ◽  
Plantar Pressure ◽  
Rehabilitation Program ◽  
Final Evaluation ◽  
Area Measurement ◽  
Initial Moment ◽  
Stroke Patients ◽  
Group A ◽  
Group B ◽  
The Right

Background: Evaluation of plantar pressure in stroke patients is a parameter that could be used for monitoring and comparing how the timing of starting a rehabilitation program effects patient improvement. Methods: We performed the following clinical and functional evaluations: initial moment (T1), intermediate (T2), and final evaluation at one year (T3). At T1 we studied 100 stroke patients in two groups, A and B (each 50 patients). The first group, A, started rehabilitation in the first three months after having a stroke, and group B started after three months from the time of stroke. Due to the impediments observed during rehabilitation, we made biomechanic evaluation for two lots, I and II (each 25 patients). Assessment of the patient was carried out by clinical (neurologic examination), functional (using the Tinetti Functional Gait Assessment Test for classifying the gait), and biomechanical evaluation (maximal plantar pressure (Pmax), contact area (CA), and pressure distribution (COP)). Results: The Tinetti scale for gait had the following scores: for group A, from 1.34 at the initial moment (T1) to 10.64 at final evaluation (T3), and for group B, 3.08 at initial moment (T1) to 9 at final evaluation (T3). Distribution of COP in the left hemiparesis was uneven at T1 but evolved after rehabilitation. The right hemiparesis had uniform COP distribution even at T1, explained by motor dominance on the right side. CA and Pmax for lot I increased more than 100%, meaning that there is a possibility for favorable improvement if the patients start the rehabilitation program in the first three months after stroke. For lot II, increases of the parameters were less than lot I. Discussions: The recovery potential is higher for patients with right hemiparesis. Biomechanic evaluation showed diversity regarding compensatory mechanisms for the paretic and nonparetic lower limb. Conclusions: CA and Pmax are relevant assessments for evaluating the effects on timing of starting a rehabilitation program after a stroke.

scholarly journals Characterizing missed identifications and errors in latent fingerprint comparisons using eye-tracking data

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0251674
Author(s):  
Thomas A. Busey ◽  
Nicholas Heise ◽  
R. Austin Hicklin ◽  
Bradford T. Ulery ◽  
JoAnn Buscaglia
Keyword(s):  
Decision Making ◽  
Eye Tracking ◽  
No Value ◽  
Eye Gaze ◽  
Tracking Data ◽  
Gaze Behavior ◽  
Cognitive Capacities ◽  
Latent Fingerprint ◽  
The Gaze ◽  
Decision Making Factors

Latent fingerprint examiners sometimes come to different conclusions when comparing fingerprints, and eye-gaze behavior may help explain these outcomes. missed identifications (missed IDs) are inconclusive, exclusion, or No Value determinations reached when the consensus of other examiners is an identification. To determine the relation between examiner behavior and missed IDs, we collected eye-gaze data from 121 latent print examiners as they completed a total 1444 difficult (latent-exemplar) comparisons. We extracted metrics from the gaze data that serve as proxies for underlying perceptual and cognitive capacities. We used these metrics to characterize potential mechanisms of missed IDs: Cursory Comparison and Mislocalization. We find that missed IDs are associated with shorter comparison times, fewer regions visited, and fewer attempted correspondences between the compared images. Latent print comparisons resulting in erroneous exclusions (a subset of missed IDs) are also more likely to have fixations in different regions and less accurate correspondence attempts than those comparisons resulting in identifications. We also use our derived metrics to describe one atypical examiner who made six erroneous identifications, four of which were on comparisons intended to be straightforward exclusions. The present work helps identify the degree to which missed IDs can be explained using eye-gaze behavior, and the extent to which missed IDs depend on cognitive and decision-making factors outside the domain of eye-tracking methodologies.

Upper airway closing pressures in snorers

1984 ◽  
Vol 57 (2) ◽  
pp. 528-535 ◽  
Author(s):  
F. G. Issa ◽  
C. E. Sullivan
Keyword(s):  
Eye Movement ◽  
Alcohol Intake ◽  
Upper Airway ◽  
Clinical Severity ◽  
Dependent Manner ◽  
Airway Closure ◽  
Rapid Eye Movement ◽  
Rapid Eye Movement Sleep ◽  
Group A ◽  
Group B

We studied 14 subjects who were selected to represent the broad range of severity of snoring: group A, four subjects who gave a history of snoring only when provoked by nasal obstruction or alcohol intake; group B, six subjects who typically snored for long periods each night; and group C, four subjects who snored heavily all night and who typically experienced a few episodes of obstructive apnea (mean apnea index 4 apneas/h). Low levels of nasal continuous positive airway pressure (CPAP) (range, 2.0–6.0 cmH2O; mean, 4.0 cmH2O) prevented snoring. Nasal occlusion caused upper airway closure during inspiratory efforts in all 14 subjects. There was a relationship between the clinical severity of snoring and the upper airway closing pressure (UACP). Upper airway closure occurred at greater suction pressures in group A than in group C but there was overlap between the three categories. The upper airway was consistently more collapsible in rapid-eye-movement sleep than in non-rapid-eye-movement sleep. There was little evidence of breath-by-breath improvement of upper airway stability during sustained asphyxia, the UACP remaining constant despite marked increases in drive to the diaphragm. In five subjects UACP was measured following alcohol intake. Alcohol reduced upper airway stability in all subjects in a dose-dependent manner.

scholarly journals Effect of Eye Movement Training on Sleep Quality of Patients with Advanced Lung Cancer Based on Pittsburgh Sleep Quality Index

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Haiping Hu ◽  
Wenying Yang ◽  
Zhimin Liu ◽  
Xiaona Zhang ◽  
Junmei Shi ◽  
...  
Keyword(s):  
Lung Cancer ◽  
Sleep Quality ◽  
Eye Movement ◽  
Negative Emotion ◽  
Advanced Lung Cancer ◽  
Lung Cancer Patients ◽  
Movement Training ◽  
Pain Scores ◽  
Group A ◽  
Group B

Objective. To explore the effect of eye movement training on sleep quality of patients with advanced lung cancer based on the Pittsburgh Sleep Quality Index (PSQI). Methods. 120 advanced lung cancer patients admitted to our hospital from January 2019 to January 2020 were selected as the research object and divided into group A (PSQI scores ≥ 10 points, n = 60) and group B (PSQI < 10 points, n = 60). Routine nursing was performed to both groups, and patients in group A received the eye movement training additionally, so as to compare their PSQI scores, negative emotion scores, adverse reaction rate (ARR), Cancer Coping Modes Questionnaire (CCMQ) scores, and pain scores. Results. After training, group A obtained significantly better sleep quality ( P < 0.05 ), lower negative emotion scores ( P < 0.001 ), lower ARR ( P < 0.05 ), better CCMQ scores ( P < 0.05 ), and lower pain scores ( P < 0.001 ) than group B. Conclusion. Eye movement training should be promoted in practice because it can reduce negative emotions, alleviate pain sensation, improve sleep quality and body condition, and lower the ARR for advanced lung cancer patients.

scholarly journals INVESTIGATING THE EFFECT OF A RAISED CYCLE TRACK, PHYSICAL SEPARATION, LAND USE AND NUMBER OF PEDESTRIAN ON CYCLISTS’ GAZE BEHAVIOR

2019 ◽  
Vol 43 (1) ◽  
pp. 112-122
Author(s):  
Gukhwa Jang ◽  
Saehoon Kim
Keyword(s):  
Land Use ◽  
Eye Gaze ◽  
Eye Tracker ◽  
Gaze Behavior ◽  
Environmental Characteristics ◽  
Physical Separation ◽  
The Gaze ◽  
Gaze Patterns ◽  
Horizontal Gaze ◽  
Fixation Points

Contemporary cities are home to an increasing number of cyclists. The gaze behavior of cyclists has an important impact upon cyclist safety and experience. Yet this behavior has not been studied to access its potential implications for urban design. This study aims to identify the eye-gaze pattern of cyclists and to examine its potential relationships with urban environmental characteristics, such as a raised cycle track, physical separation, land use, and number of pedestrian. This study measured and analyzed 40 cyclist’s gaze patterns using an eye tracker; the results were as follows. First, cyclists presented a T-shaped gaze pattern with two spots of frequent eye fixation points; the pattern suggests that it may benefit cyclists with greater safety and better readiness of road situation to avoid crashes. Second, more active horizontal gaze dispersion within the T-shaped gaze pattern was observed when participants cycled on a shared and non-raised bikeway. This indicates that there is a more suitable gaze behavior with different gaze limitations depending on the environmental characteristics. Therefore, bicycle facilities need to be constructed according to the consideration of the T-shaped gaze area and the change in cyclists’ gaze behavior in each environment to increase the effectiveness of bicycle facilities.

An ultrastructural study of sertoli cells in two geographically isolated populations of Aphanius dispar

1992 ◽  
Vol 50 (1) ◽  
pp. 548-549
Author(s):  
Taber A. Ba-Omar ◽  
Philip F. Prentis
Keyword(s):  
Ultrastructural Level ◽  
Uranyl Acetate ◽  
Freshwater Teleost ◽  
Isolated Populations ◽  
En Bloc ◽  
The North ◽  
Group A ◽  
Ultrathin Sections ◽  
Group B ◽  
Geographically Isolated

We have recently carried out a study of spermiogenic differentiation in two geographically isolated populations of Aphanius dispar (freshwater teleost), with a view to ascertaining variation at the ultrastructural level. The sampling areas were the Jebel Al Akhdar in the north (Group A) and the Dhofar region (Group B) in the south. Specimens from each group were collected, the testes removed, fixed in Karnovsky solution, post fixed in OsO, en bloc stained with uranyl acetate and then routinely processed to Agar 100 resin, semi and ultrathin sections were prepared for study.

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