End-Spurt in Addition of Numbers

1974 ◽  
Vol 39 (1) ◽  
pp. 121-122 ◽  
Author(s):  
John F. Catalano
Keyword(s):  
Performance Improvement ◽  
Present Experiment ◽  
Mental Activity ◽  
Performance Decrement ◽  
Rotary Pursuit ◽  
Pursuit Tracking ◽  
Significant Performance

End-spurt (performance improvement as the end of a task is approached) has been previously found among those individuals who believed that the task was 90% completed in both vigilance and rotary pursuit tracking. The present experiment was carried out to determine whether this would hold true if the task involved mental activity such as the addition of numbers. The end-spurt did occur when Ss believed that the task was 90% completed. Also, significant performance decrement occurred when it was believed they were only 50% completed.

Factors in Recovery from Performance Decrement: Activation, Inhibition and Warm-up

1967 ◽  
Vol 24 (3_suppl) ◽  
pp. 1223-1231 ◽  
Author(s):  
John F. Catalano ◽  
Patricia M. Whalen
Keyword(s):  
Enhancement Effect ◽  
Performance Decrement ◽  
Main Condition ◽  
Warm Up ◽  
Rotary Pursuit ◽  
Muscular Tension ◽  
Activation Level ◽  
Pursuit Rotor ◽  
Pursuit Tracking ◽  
Direction Opposite

It has been recently found that rotary pursuit tracking performance can be enhanced as a result of inducing muscular tension by requiring individuals to squeeze a dynamometer as an interpolated activity between tracking trials. The present experiment was designed to determine whether such enhancement would result if the tension inducing activity utilized the same muscular movements as those involved in the rotary pursuit task. In the main condition, Ss were required to overcome 3 in.-lb. of resistance in order to turn a disk at 60 rpm. This interpolated activity significantly enhanced reminiscence beyond that following rest alone. No enhancement occurred in a control condition when there was no resistance to overcome. Another condition in which muscular tension was induced by turning the disk in a direction opposite to that of the pursuit rotor target resulted in an enhancement of reminiscence. A final tension inducing condition in which the disk was turned with the non-tracking hand produced a bilateral enhancement effect. It was generally found that those individuals with the greatest amount of performance decrement tended to show the greatest enhancement. The results of this study were viewed as additional evidence of the influence of changes in activation level upon efficiency of performance.

The Visual Response Component of Rotary Pursuit Tracking

1965 ◽  
Vol 21 (2) ◽  
pp. 555-560 ◽  
Author(s):  
Henry S. Rosenquist
Keyword(s):  
Present Experiment ◽  
Visual Response ◽  
Response Component ◽  
Decremental Effect ◽  
Rotary Pursuit ◽  
Subsequent Performance ◽  
Left Hand ◽  
Statistical Adjustment ◽  
Pursuit Tracking ◽  
The Right

Adams (1955) found that watching the rotary pursuit affected subsequent performance. Since this finding disagrees with reports by Melton (1947), Ammons (1951), and Duncan (1957), the present experiment set out to test Adams' watching procedure for reliability and generality. Each of 198 Ss tracked the rotary pursuit for 5 min. with the right hand, next received one of 11 different treatments consisting of various durations of watching, resting, or both, and finally resumed tracking for another 5 min., using the left hand. After statistical adjustment of left-hand scores to the expected post-rest level, the results showed a decremental effect, supporting Adams, and indicated that the effect was functionally related to various durations of watching and resting.

Effect of Perceived Proximity to End of Task upon End-Spurt

1973 ◽  
Vol 36 (2) ◽  
pp. 363-372 ◽  
Author(s):  
John F. Catalano
Keyword(s):  
Performance Improvement ◽  
Questionnaire Data ◽  
Rotary Pursuit ◽  
Pursuit Tracking ◽  
Different Types ◽  
Industrial Settings ◽  
The Relationship

2 experiments employing different types of tasks (vigilance and rotary pursuit tracking) were carried out to determine the relationship between S‘s perceived proximity to the end of the task and the occurrence of end-spurt (performance improvement as the end of a task is approached). In both experiments significant end-spurt occurred when Ss were led to believe that the task was 90% completed. This finding was difficult to explain since questionnaire data showed nothing unique about the meaning of “90%.” An arousal interpretation of the end-spurt phenomenon was offered but a distinction was made between end-spurt occurring in laboratory situations and industrial settings.

Arousal as a Factor in Reminiscence

1967 ◽  
Vol 24 (3_suppl) ◽  
pp. 1171-1180 ◽  
Author(s):  
John F. Catalano
Keyword(s):  
Significant Enhancement ◽  
Performance Decrement ◽  
Rotary Pursuit ◽  
Muscular Tension ◽  
Prior Performance ◽  
Activation Level ◽  
Pursuit Tracking

Explanations of performance changes such as decrement and reminiscence are usually attributed to the development and dissipation of inhibition. It was suggested here that changes of activation level may also account for these performance phenomena. An experiment was designed to determine the effects of an interpolated activating stimulus (induced muscular tension) upon reminiscence in rotary pursuit tracking. A significant enhancement of reminiscence beyond that resulting from rest alone was found to occur following stimulation. Magnitude of enhancement was a function of intensity of stimulation. A bilateral effect also occurred. A relationship was observed between enhancement and the presence of prior performance decrement. The results were interpreted as supporting the activation hypothesis.

Consideration of structural constraints in passive rotor blade design for improved performance

2015 ◽  
Vol 119 (1222) ◽  
pp. 1513-1539 ◽  
Author(s):  
J. W. Lim
Keyword(s):  
Performance Improvement ◽  
Rotor Blade ◽  
Parametric Design ◽  
Control Point ◽  
Bending Moment ◽  
Structural Constraints ◽  
Design Variables ◽  
Significant Performance ◽  
Structural Redesign ◽  
Improved Performance

AbstractThis design study applied parameterisation to rotor blade for improved performance. In the design, parametric equations were used to represent blade planform changes over the existing rotor blade model. Design variables included blade twist, sweep, dihedral, and radial control point. Updates to the blade structural properties with changes in the design variables allowed accurate evaluation of performance objectives and realistic structural constraints – blade stability, steady moments (flap bending, chord bending, and torsion), and the high g manoeuvring pitch link loads. Performance improvement was demonstrated with multiple parametric designs. Using a parametric design with advanced aerofoils, the predicted power reduction was 1·0% in hover, 10·0% at μ = 0·30, and 17·0% at μ = 0·40 relative to the baseline UH-60A rotor, but these were obtained with a 35% increase in the steady chord bending moment at μ = 0·30 and a 20% increase in the half peak-to-peak pitch link load during the UH-60A UTTAS manoeuvre Low vibration was maintained for this design. More rigorous design efforts, such as chord tapering and/or structural redesign of the blade cross section, would enlarge the feasible design space and likely provide significant performance improvement.

Reminiscence and Strategies of Performance in Rotary Pursuit Tracking

1989 ◽  
Vol 68 (1) ◽  
pp. 219-226
Author(s):  
Ubaldo Cuesta
Keyword(s):  
Maximum Speed ◽  
Crossover Effect ◽  
Rotary Pursuit ◽  
Pursuit Rotor ◽  
Pursuit Tracking

The maximum speed at which man detects and corrects errors is analyzed on the pursuit rotor. During the prerest performance, scores of about 220 msec. are found, for both extravertive and introvertive subjects. During the postrest performance a crossover effect appeared: extraverts had scores near 60 msec, while introverts did not surpass 100 msec. The results are discussed in the framework of Eysenck and Frith's (1977) theory of reminiscence.

Supplementary feedback in rotary-pursuit tracking.

1964 ◽  
Vol 68 (1) ◽  
pp. 53-57 ◽  
Author(s):  
Ina Mcd Bilodea ◽  
Henry S. Rosenquist
Keyword(s):  
Rotary Pursuit ◽  
Pursuit Tracking

scholarly journals Optimized distributed systems achieve significant performance improvement on sorted merging of massive VCF files

GigaScience ◽  
2018 ◽  
Vol 7 (6) ◽  
Author(s):  
Xiaobo Sun ◽  
Jingjing Gao ◽  
Peng Jin ◽  
Celeste Eng ◽  
Esteban G Burchard ◽  
...  
Keyword(s):  
Distributed Systems ◽  
Performance Improvement ◽  
Significant Performance

Fiber nonlinearity compensation using optical phase conjugation in dispersion-managed coherent transmission systems

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jinqing Hao ◽  
Bingchen Han
Keyword(s):  
Performance Improvement ◽  
System Performance ◽  
Optical Transmission ◽  
Phase Conjugation ◽  
Fiber Amplifiers ◽  
Transmission Systems ◽  
Fiber Nonlinearity ◽  
Erbium Doped ◽  
Significant Performance ◽  
Transmission Link

Abstract In the discretely amplified transmission systems with erbium-doped fiber amplifiers, the system performance of nonlinearity-compensated optical transmission based on pre-dispersed spectral inversion (PSI) is investigated numerically. We find that PSI offers more significant performance improvement in dispersion-managed (DM) links than that in non-dispersion-managed (noDM) links. On the other hand, the DM link is more sensitive to the span offset from the center of the transmission link than noDM link. The performance difference between DM and noDM links is 1 dB if the span offset equals four spans in 20 × 90 km nonlinear transmission. Furthermore, we show that for the dispersion-managed transmission, in order to obtain the best system performance, the amount of pre-dispersion of the PSI, should be optimized over different dispersion maps.

Sign in / Sign up

Export Citation Format

Share Document