scholarly journals Stereoscopic Visual Perceptual Learning in Seniors

Geriatrics ◽  
2021 ◽  
Vol 6 (3) ◽  
pp. 94
Author(s):  
Sabine Erbes ◽  
Georg Michelson
Keyword(s):  
Reaction Time ◽  
Cortical Plasticity ◽  
Training Session ◽  
Reaction Times ◽  
Stereoscopic Vision ◽  
Training Methods ◽  
Static Test ◽  
Before And After ◽  
Training Apparatus ◽  
The Individual

Background: We showed that seniors can improve their stereoscopic ability (stereoacuity) and corresponding reaction time with repetitive training and, furthermore, that these improvements through training are still present even after a longer period of time without training. Methods: Eleven seniors (average age: 85.90 years) trained twice a week for six weeks with dynamic stereoscopic perception training using a vision training apparatus (c-Digital Vision Trainer®). Stereoscopic training was performed in 12 training session (n = 3072) of visual tasks. The task was to identify and select one of four figures (stereoscopic stimuli) that was of a different disparity using a controller. The tests included a dynamic training (showing rotating balls) and a static test (showing plates without movement). Before and after training, the stereoacuity and the corresponding reaction times were identified with the static stereotest in order to determine the individual training success. The changes in respect to reaction time of stereoscopic stimuli with decreasing disparity were calculated. Results: After 6 weeks of training, reaction time improved in the median from 936 arcsec to 511 arcsec. Stereoscopic vision improved from 138 arcsec to 69 arcsec, which is an improvement of two levels of difficulty. After 6 months without training, the improvement, achieved by training, remained stable. Conclusions: In older people, visual training leads to a significant, long-lasting improvement in stereoscopic vision and the corresponding reaction time in seniors. This indicates cortical plasticity even in old age.

EFFECT OF REACTION TRAINING ON DURATION AND REACTION TIMES

2021 ◽  
Vol 7 (27) ◽  
pp. 86-92
Author(s):  
Tülin ATAN
Keyword(s):  
Reaction Time ◽  
Normal Distribution ◽  
Training Program ◽  
Reaction Times ◽  
Rank Test ◽  
Tennis Players ◽  
Before And After ◽  
Speed Performance ◽  
And Performance ◽  
Training Exercises

In this study, it was aimed to examine the effects of reaction training on reaction time and speed in tennis players. For this purpose a total of 18 tennis players; 9 male (age; 13.33 ± 1.80 years) and 7 female (13.85 ± 2.19 years) were voluntarily participated the study. In this study, the reaction training program, which was applied for 2 days a week for 12 weeks, was prepared in addition to tennis training. In the reaction training, exercises suitable for visual and auditory reaction were used. Before and after the 12-week reaction training, a 30 m speed running test and reaction time tests were performed. Whether the data showed normal distribution was analyzed with the Shapiro Wilk test and it was determined that the data did not show normal distribution. Mann Whitney U test was used in comparisons between the two groups. Wilcoxan Signd Rank test was used in the comparisons made before and after the training. As a result of the statistical analysis, it was seen that both the physical characteristics and performance parameters of males and females in our study group were not statistically different (p>0.05). For this reason, all subjects were taken into consideration regardless of gender in comparisons before and after tennis training. After the reaction training program applied to the subjects, it was determined that the 30 m speed performance values were shortened in duration compared to the pre-training period, that is, the speed improved (p <0.01). When the reaction time values were compared before and after the training program applied, it was seen that the reaction time values improved significantly after the training (p <0.01). As a result, reaction training performed in tennis players’ increases speed and reaction time performance. Reaction training is recommended in sports branches where this type of motor is important.

scholarly journals Optimalization of reaction time through imagery and concentration training in fencing

MEDIKORA ◽  
2021 ◽  
Vol 20 (1) ◽  
pp. 36-43
Author(s):  
Agus Hariyanto ◽  
Mohammad Wahyu Bagus Prakosa ◽  
Anindya Mar'atus Sholikhah
Keyword(s):  
Reaction Time ◽  
Extracurricular Activities ◽  
Positive Impact ◽  
Reaction Times ◽  
T Test ◽  
Significance Level ◽  
Imagery Training ◽  
Before And After ◽  
Quasi Experimental ◽  
Paired T Test

This study aims to investigate the effect of imagery training and concentration on the reaction time of students taking fencing extracurricular activities. It was a quasi-experimental research using quantitative approach. A total of 15 respondents were classified into 3 groups, which were control (K) and two experimental groups. Students in experimental groups were given imagery training (E1) and concentration training (E2) for six weeks and reaction times were measured using Electronic Fencing Target-1 (EFT-1) before and after the exercise was given. Data were analyzed using descriptive and inferential statistic using paired t-test and Anova one way, and significance level was set at p=0.05. The results found that the imagery and concentration training had a positive impact on the decrease of reaction time, with significance values of 0.008 and 0.005, respectively. From these results it can be concluded that imagery and concentration exercises can help players to improve their reaction time, so that fencers can react quickly to every movement. OPTIMALISASI WAKTU REAKSI MELALUI LATIHAN IMAGERY DAN KONSENTRASI DALAM OLAHRAGA ANGGAR AbstrakPenelitian ini bertujuan untuk mengetahui pengaruh latihan imagery dan konsentrasi terhadap kecepatan waktu reaksi pada siswa yang mengikuti ekstrakulikuler anggar. Penelitian ini merupakan penelitian eksperimen semu yang menggunakan pendekatan kuantitatif. Sebanyak 15 orang responden dikelompokkan menjadi 3 kelompok, yaitu satu kelompok kontrol (K) dan dua kelompok eksperimen yang diberi latihan imagery (E1) dan latihan konsentrasi (E2). Latihan dilakukan selama enam minggu dan waktu reaksi diukur sebelum dan sesudah latihan diberikan menggunakan Electronic Fencing Target-1 (EFT-1). Analisis data dilakukan secara deskriptif dan inferensial menggunakan uji paired t-test dan Anova one way, dengan nilai signifikan ditetapkan sebesar 0.05. Hasil analisis didapatkan bahwa latihan imagery dan konsentrasi yang diberikan kepada responden memberikan dampak positif terhadap penurunan waktu reaksi, dengan nilai signifikansi secara berturut-turut sebesar 0.008 dan 0.005. Dari hasil ini dapat disimpulkan bahwa latihan imagery dan konsentrasi dapat membantu pemain untuk meningkatkan kemampuan reaksi, sehingga pemain anggar dapat bereaksi dengan cepat terhadap setiap gerakan.

scholarly journals Human Reaction Times: Linking Individual and Collective Behaviour Through Physics Modeling

Symmetry ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 451
Author(s):  
Juan Carlos Castro-Palacio ◽  
Pedro Fernández-de-Córdoba ◽  
J. M. Isidro ◽  
Sarira Sahu ◽  
Esperanza Navarro-Pardo
Keyword(s):  
Reaction Time ◽  
Gaussian Function ◽  
Visual Stimuli ◽  
Reaction Times ◽  
Cognitive Disorders ◽  
Reaction Time Data ◽  
Ideal Gas ◽  
Time Data ◽  
Physics Modeling ◽  
The Individual

An individual’s reaction time data to visual stimuli have usually been represented in Experimental Psychology by means of an ex-Gaussian function. In most previous works, researchers have mainly aimed at finding a meaning for the parameters of the ex-Gaussian function which are known to correlate with cognitive disorders. Based on the recent evidence of correlations between the reaction time series to visual stimuli produced by different individuals within a group, we go beyond and propose a Physics-inspired model to represent the reaction time data of a coetaneous group of individuals. In doing so, a Maxwell–Boltzmann-like distribution appeared, the same distribution as for the velocities of the molecules in an Ideal Gas model. We describe step by step the methodology we use to go from the individual reaction times to the distribution of the individuals response within the coetaneous group. In practical terms, by means of this model we also provide a simple entropy-based methodology for the classification of the individuals within the collective they belong to with no need for an external reference which can be applicable in diverse areas of social sciences.

scholarly journals No Myth far and wide:

2018 ◽  
Vol 2 ◽  
Author(s):  
Joachim Hüffmeier ◽  
Stefan Krumm
Keyword(s):  
Reaction Time ◽  
Reaction Times ◽  
Reaction Time Data ◽  
Stopping Rule ◽  
Time Estimate ◽  
Time Data ◽  
Methodological Choices ◽  
Time Correction ◽  
The Individual ◽  
High Chance

Skorski, Extebarria, and Thompson (2016) aim at our article on relay swimmers (Hüffmeier, Krumm, Kanthak, & Hertel, 2012). We have shown that professional freestyle swimmers at relay positions 2 to 4 swam faster in the relay than in the individual competition if they had a high chance to win a relay medal. After applying a reaction-time correction that controls for different starting procedures in relay and individual competitions, Skorski et al. (2016) conclude that swimmers in relays do not swim faster. At first sight, their results appear to show this very pattern. However, we argue that the authors’ findings and conclusion—that our finding is a myth—are not warranted. First, we have also controlled for quicker reaction times in the relay competition. Our correction has been based on the swimmers’ own reaction time data rather than on a constant reaction time estimate and is, thus, more precise than theirs. Second, Skorski et al. treat data from international and national competitions equally although national relay competitions are less attractive for the swimmers than national individual competitions. This difference likely biases their data towards slower relay times. Third, the authors select a small and arbitrary sample without explicit power considerations or a clear stopping rule. Fourth, they unfavorably aggregate their data. We conclude that the reported results are most likely due to the methodological choices by Skorski et al. and do not invalidate our findings.

scholarly journals The Influence of Training on Preferences

2017 ◽  
pp. 676-683
Author(s):  
Stina Alriksson
Keyword(s):  
Training Session ◽  
High Strength ◽  
Environmental Issues ◽  
Pulp Industry ◽  
Process Procedures ◽  
Before And After ◽  
The Individual ◽  
Alternative Processes ◽  
Previous Training ◽  
And Training

Any organisation or company that want to bring about a change in the process, procedures or internal organisation encounters the issue of training the staff. Training is commonly used to increase dedication in specific issues for example environmental issues, energy saving or enhancing the overall competence of the staff. When working with environmental- or energy issues, the attitude of the employees is often considered one of the most important factors for the outcome. In this paper two different studies are compared. In both studies training has been included as a background factor in a conjoint analysis study. The first study concerns preferences for new materials, in this case advanced high strength steel. The respondents were asked to rank eight alternative steel containers and the results, (preferences) were compared to any previous training the individual respondent had. The same procedure was taken in study number two where employees at a paper & pulp industry was asked to rank eight alternative processes with different environmental impacts. Also here the respondents were asked to state any previous training and the preferences was compared to previous training. It has not been possible to show any significant connection between preferences in a specific issue and training in the same area. However, it would be interesting to use the method to measure the effect of training on preferences before and after a specific training session.

scholarly journals The interaction between elapsed time and decision accuracy differs between humans and rats

2019 ◽  
Author(s):  
Carly A Shevinsky ◽  
Pamela Reinagel
Keyword(s):  
Decision Making ◽  
Reaction Time ◽  
Visual Motion ◽  
Reaction Times ◽  
Local Analysis ◽  
Decision Strategy ◽  
Motion Discrimination ◽  
Motion Coherence ◽  
The Many ◽  
The Individual

AbstractA stochastic visual motion discrimination task is widely used to study rapid decision-making in humans and animals. Among trials of the same sensory difficulty within a block of fixed decision strategy, humans and monkeys are widely reported to make more errors in the individual trials with longer reaction times. This finding has posed a challenge for the drift-diffusion model of sensory decision-making, which in its basic form predicts that errors and correct responses should have the same reaction time distributions. We previously reported that rats also violate this model prediction, but in the opposite direction: for rats, motion discrimination accuracy was highest in the trials with the longest reaction times. To rule out task differences as the cause of our divergent finding in rats, the present study tested humans and rats using the same task and analyzed their data identically. We confirmed that rats’ accuracy increased with reaction time, whereas humans’ accuracy decreased with reaction time in the same task. These results were further verified using a new temporally-local analysis method, ruling out that the observed trend was an artifact of non-stationarity in the data of either species. The main effect was found whether the signal strength (motion coherence) was varied in randomly interleaved trials or held constant within a block. The magnitude of the effects increased with motion coherence. These results provide new constraints useful for refining and discriminating among the many alternative mathematical theories of decision-making.

scholarly journals Aqueous and Enzymatic Extraction of Oil and Protein from Almond Cake: A Comparative Study

Processes ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 472 ◽  
Author(s):  
Thaiza S. P. Souza ◽  
Fernanda F. G. Dias ◽  
Maria G. B. Koblitz ◽  
Juliana M. L. N. de M. Bell
Keyword(s):  
Reaction Time ◽  
Protein Extraction ◽  
Reaction Times ◽  
Extraction Process ◽  
Oil Yield ◽  
Food Applications ◽  
Aqueous Extraction Process ◽  
The Individual ◽  
Mechanical Expression ◽  
Central Composite

The almond cake is a protein- and oil-rich by-product of the mechanical expression of almond oil that has the potential to be used as a source of valuable proteins and lipids for food applications. The objectives of this study were to evaluate the individual and combined effects of solids-to-liquid ratio (SLR), reaction time, and enzyme use on oil and protein extraction yields from almond cake. A central composite rotatable design was employed to maximize the overall extractability and distribution of extracted components among the fractions generated by the aqueous (AEP) and enzyme-assisted aqueous extraction process (EAEP). Simultaneous extraction of oil and protein by the AEP was favored by the use of low SLR (1:12.82) and longer reaction times (2 h), where extraction yields of 48.2% and 70% were achieved, respectively. Increased use of enzyme (0.85%) in the EAEP resulted in higher oil (50%) and protein (75%) extraction yields in a shorter reaction time (1 h), compared with the AEP at the same reaction time (41.6% oil and 70% protein extraction). Overall, extraction conditions that favored oil and protein extraction also favored oil yield in the cream and protein yield in the skim. However, increased oil yield in the skim was observed at conditions where higher oil extraction was achieved. In addition to improving oil and protein extractability, the use of enzyme during the extraction resulted in the production of skim fractions with smaller and more soluble peptides at low pH (5.0), highlighting possible uses of the EAEP skim in food applications involving acidic pH. The implications of the use of enzyme during the extraction regarding the de-emulsification of the EAEP cream warrant further investigation.

Experimental Finger Dyspraxia

1952 ◽  
Vol 4 (1) ◽  
pp. 1-10 ◽  
Author(s):  
C. V. Jackson ◽  
O. L. Zangwill
Keyword(s):  
Reaction Time ◽  
Rank Order ◽  
Reaction Times ◽  
Mirror Image ◽  
Visual Control ◽  
Constant Speed ◽  
Direct Vision ◽  
Finger Movements ◽  
The Individual

Subjects were required to perform discrete finger movements in accordance with a pre-arranged sequence of instructions. In all cases, any movement made by any finger was recorded by means of a constant-speed kymograph equipped with levers designed to record separately the movements of the individual fingers. This experiment was carried out under three conditions: (a) with no vision of the hand; (b) with direct vision of the hand; and (c) with the hand presented in mirror-image. It was found that, whereas deprivation of visual control was without effect on the efficiency of finger movements, presentation of the hand in mirror-image gave rise to significant increases in reaction time of three fingers and to an increase in the percentages of prior and substitute movements of other digits. Phenomena akin to depersonalisation were reported in some cases. It was also found that the rank order of mean reaction times of the five digits was approximately constant under all conditions and that the two fingers with the shortest reaction times were preceded by the fewest movements of other digits. These two digits were also the most frequently moved in advance when movements of other digits were requested and it is suggested that they have a certain “signpost function” in guiding identification of the remaining fingers. Some implications of these results for an understanding of “finger agnosia” are briefly indicated in an Appendix.

scholarly journals Hüffmeier & Krumm (2018). No Myth far and wide: Relay Swimming is Faster than Individual Swimming and the Conclusion of Skorski et al. (2016) is Unfounded

2018 ◽  
Author(s):  
Joachim Hüffmeier ◽  
Stefan Krumm
Keyword(s):  
Reaction Time ◽  
Reaction Times ◽  
Stopping Rule ◽  
Time Estimate ◽  
Methodological Choices ◽  
Time Correction ◽  
The Individual ◽  
High Chance

Skorski, Extebarria, and Thompson (2016) aim at our article on relay swimmers (Hüffmeier, Krumm, Kanthak, &amp; Hertel, 2012). We have shown that professional freestyle swimmers at relay positions 2 to 4 swam faster in the relay than in the individual competition if they had a high chance to win a relay medal. After applying a reaction-time correction that controls for different starting procedures in relay and individual competitions, Skorski et al. (2016) con-clude that swimmers in relays do not swim faster. At first sight, their results appear to show this very pattern. However, we argue that the authors’ findings and conclusion—that our find-ing is a myth—are not warranted. First, we have also controlled for quicker reaction times in the relay competition. Our correction has been based on the swimmers’ own reaction time da-ta rather than on a constant reaction time estimate and is, thus, more precise than theirs. Sec-ond, Skorski et al. treat data from international and national competitions equally although na-tional relay competitions are less attractive for the swimmers than national individual competi-tions. This difference likely biases their data towards slower relay times. Third, the authors se-lect a small and arbitrary sample without explicit power considerations or a clear stopping rule. Fourth, they unfavorably aggregate their data. We conclude that the reported results are most likely due to the methodological choices by Skorski et al. and do not invalidate our findings.

scholarly journals Does Anxiety Affect Neuropsychological Assessment in College Athletes?

2020 ◽  
Vol 29 (2) ◽  
pp. 238-242 ◽  
Author(s):  
Christopher P. Tomczyk ◽  
George Shaver ◽  
Tamerah N. Hunt
Keyword(s):  
Reaction Time ◽  
College Athletes ◽  
Brain Injuries ◽  
Neuropsychological Testing ◽  
Reaction Times ◽  
Cognitive Testing ◽  
Bottom Line ◽  
Cross Sectional ◽  
Before And After ◽  
Neuropsychological Assessments

Clinical Scenario: Anxiety is a mental disorder that affects a large portion of the population and may be problematic when evaluating brain injuries such as concussion. The reliance of cognitive testing in concussion protocols call for the examination of potential cognitive alterations commonly seen in athletes with anxiety. Focused Clinical Question: Does anxiety affect neuropsychological assessments in healthy college athletes? Summary of Key Findings: Three studies were included: 1 cross-sectional study and 2 prospective cohort studies. One study examined the effect of a range of psychological issues on concussion baseline testing in college athletes. Another study examined the effect of anxiety on reaction time both before and after sport competition in college-aged athletes. The final study examined the effects of psychosocial issues on reaction time during demanding tasks in college athletes. The first study reported slower simple and complex reaction times in athletes with anxiety. The second study found that athletes with high trait anxiety have slower reaction times both before and after competition. The third study reported that demanding tasks led to increased state anxiety which slowed reaction time. Overall, all 3 studies support the adverse effect anxiety can have on cognitive testing in athletes. Clinical Bottom Line: College athletes who present with anxiety at baseline may be susceptible to decreased performance on neuropsychological assessments. Strength of Recommendation: There is level B evidence that anxiety in healthy college athletes can impact neuropsychological assessments, and level C evidence that anxiety at baseline concussion assessment impacts neuropsychological testing in college athletes.

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