Effects of Patterning on Flicker Frequency

1983 ◽  
Vol 27 (1) ◽  
pp. 46-50 ◽  
Author(s):  
Jack D. Grimes
Keyword(s):  
White Background ◽  
Significant Finding ◽  
Computer Terminal ◽  
Line Drawings ◽  
Spatial Image ◽  
Black Background ◽  
Luminance Difference ◽  
The Subject ◽  
The Relationship ◽  
Video Format

Flicker was studied as perceived on a raster-scan CRT-based computer terminal in a typical use environment. The subject of the research was the relationship between the perception of flicker and the kind of spatial image presented. Both traditional images (filled white disks or squares) and images consisting of text and line drawings, similar in content to typical graphic computer terminal displays, were used in the study. This study measured the flicker perception of eight people. The most significant finding from this study was that CFF thresholds for some images presented on CRT displays in a typical use setting, differed significantly from more traditional images used in most CFF studies reported in the literature. For the eight images tested, the two which exhibited significantly higher CFF thresholds were lines or text on a black background (patterns 3 and 4). Therefore, an important factor to be considered in the prediction of the flicker characteristics of a 60 Hertz, noninterlaced CRT display in conditions similar to those of this study is the choice of normal video (black background) or reverse video format. The white background video format is likely to flicker when the display luminance is above 20 ft-L while the black background video format threshold was about 80 ft-L for both patterns 3 and 4. Alternatively, this luminance difference corresponds to about a 10 Hertz shift in CFF. In this study, the choice of video format alone, resulted in a luminance difference of 60 ft-L at CFF, or alternatively, resulted in a 10 Hertz shift in CFF at a particular luminance, for images normally found on actual CRT displays.

The Relation between Target Localisation in Strings of Letters, Contrast, and Refresh Rate

Perception ◽  
1996 ◽  
Vol 25 (1_suppl) ◽  
pp. 167-167
Author(s):  
N van Kruysbergen ◽  
A Hendriks
Keyword(s):  
Target Location ◽  
The Other ◽  
White Background ◽  
Original Experiment ◽  
Refresh Rate ◽  
Black Background ◽  
Target Localisation ◽  
The Subject ◽  
The Right ◽  
The Relationship

Jacobs (1987, Vision Research27 1953 – 1966) obtained psychometric curves to investigate the relationship between target localisability and the latency of primary saccades. These psychometric curves show correct scores as a function of string length, target location, and target-background similarity. They were obtained with white text on a black background. We repeated this experiment, with a few extensions. First, we did not only use white text on a black background, but we used black text on a white background as well. The stimuli were also presented with the use of isoluminant colours. Second, we varied the refresh rate of the screen (from 60 Hz up to 150 Hz). Third, we used two different instructions for the subjects: in one the subject was instructed to indicate the position of the target relative to the beginning of the string; in the other the position of the target relative to the fixation point. When the string was presented to the right of the fixation point, the results of these two instructions were predicted to be similar; in the other case the results might be different. The results of our experiments show a clear effect of the amount of contrast between text and background, and an influence of the screen refresh rate. We also found that the results differ depending on the instruction used. Sadly, we were not able to replicate all of the results of the original experiment by Jacobs.

scholarly journals Development and Validation of the Minnesota Low Vision Reading Test (MNRead) Acuity Chart for the Asante Twi Language

1970 ◽  
Vol 19 (4) ◽  
pp. 2945-2953
Author(s):  
Samuel Bert Boadi-Kusi ◽  
Michael Agyemang Kwarteng ◽  
Emmanuel Asubonteng
Keyword(s):  
Visual Acuity ◽  
Low Vision ◽  
White Background ◽  
Second Phase ◽  
Strong Correlations ◽  
Cross Sectional ◽  
Black Background ◽  
Near Visual Acuity ◽  
Development And Validation ◽  
The Relationship

Aim: To design and validate a MNREAD Asante Twi version reading chart, to aid in the assessment of near visual acuity of natives Ghanaians.Methods: Cross-sectional and experimental designs were employed in phases I and II respectively of this study. The chart was developed using 20 transited pupils in class four in the Kumasi metropolis in phase I and validated in a clinical setting at the Manhyia District Hospital, Kumasi, using students in phase II.Results: A total of 100 participants (mean age; 22.19 ± 1.61 years) were involved in the second phase of this study. A Pearson product-moment correlation coefficient was computed to assess the relationship between MNREAD Asante Twi charts logMAR scores in both eyes. The MNREAD-Asante Twi acuity charts had very strong correlations (r = 0.94, p < 0.001) for MNREAD set 1A (black on white background) scores and MNREAD set 2A (black on white background) for acuity scores. Correlation between MNREAD set 1B (white on black background) scores and MNREAD set 2B (white on black background) scores was r = 0.95, p < 0.001.Conclusion: MNREAD Asante Twi reading chart will enhance the measurement of near visual function in native Ghanaians.Keywords: Asante Twi, MNREAD, Visual Acuity, Near chart, Ghana.

Why are We Able to See Real-World Scenes So Quickly? An Investigation of the Role of Expectancy and Familiarity

1978 ◽  
Vol 22 (1) ◽  
pp. 378-382 ◽  
Author(s):  
Richard C. Teitelbaum ◽  
Robert J. Mezzanotte ◽  
Irving Biederman
Keyword(s):  
Real World ◽  
Visual Recognition ◽  
Verbal Label ◽  
Line Drawings ◽  
The Subject ◽  
The Relationship

Subjects performed a task which allowed measurement of their speed of comprehension of real-world scenes: They attempted to detect the incongruity in the relationship between an object and its context. In 100 msec, presentations of line drawings of real-world scenes, objects could be inappropriately positioned (e.g., a fire hydrant on top of a mailbox), sized (e.g., the hydrant looking larger than a truck) or floating in air. Detection times were not significantly affected by priming the subject with a verbal label of the scene prior to its viewing (e.g., telling him he was going to see a “kitchen”) but were significantly affected by the prior presentation of the scene upwards of 30 trials earlier. The results document a remarkably efficient, content addressable, accessing mechanism for visual recognition in humans.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

HUBUNGAN GAYA BELAJAR SISWA TERHADAP ASPEK PENGETAHUAN SISWA PADA MATA PELAJARAN SISTEM KOMPUTER DI SMK IT RAHMATAN KARIMAH BENGKULU TENGAH

2020 ◽  
Vol 1 (01) ◽  
pp. 13-20
Author(s):  
Dian Saputra
Keyword(s):  
Learning Styles ◽  
Computer System ◽  
Learning Style ◽  
Descriptive Analysis ◽  
Visual Learning ◽  
Auditory Learning ◽  
Analysis Techniques ◽  
Post Test ◽  
The Subject ◽  
The Relationship

This study aims to find out the relationship between learning style and students’ knowledge aspect on Computer System Subject at SMK IT Rahmatan Karimah of  Central Bengkulu, the type of research is quantitative and the subject of research is grade X in SMK IT Rahmatan Karimah of  Central Bengkulu. Data collection techniques using observation, Questionnaire and documentation. Data analysis techniques used were Descriptive Analysis, and inferential Statistical Analysis. The results of visual learning style post-test were 11 people with a mean of 76.36, an auditory learning style of 8 people at a mean of 62.14, a kinesthetic learning style of 3 people at a mean of 50.33, apart from that (r x y = 2.35) and the magnitude of r is reflected in the table (r table = 0.4132). Then rxy > r table ie = 2.35> 0.4132. In other words, Ho is rejected and Ha is accepted. It has a significant relationship between the learning styles of students and students’ knowledge aspect on Computer System Subject of grade X TKJ in SMK IT Rahmatan Karimah of  Central Bengkulu

The Miracles and Cult of St Margaret of Scotland

2018 ◽  
Vol 97 (1) ◽  
pp. 1-11 ◽  
Author(s):  
SangDong Lee
Keyword(s):  
Historical Research ◽  
The Subject ◽  
The Relationship

Queen Margaret (1070–93) has been the subject of much historical research. Previous studies of the queen and later saint have been undertaken from several different perspectives, including the biographical, institutional and hagiographical. In addition, some scholars have focused on her piety and later cult. Although a saint's miracles were one of the significant elements affecting the development of a cult, far less interest has been shown in the geopolitical importance of the miracles attributed to St Margaret and the relationship between the miracles and the saint's cult. The intention of this paper is to examine the miracles attributed to St Margaret and to identify their characteristics within the context of their contribution to, and influence in, the development of her cult.

The Priority of Democracy

2011 ◽  
Author(s):  
Jack Knight ◽  
James Johnson
Keyword(s):  
Decision Making ◽  
Monetary Policy ◽  
Political Institutions ◽  
Federal Reserve ◽  
Democratic Politics ◽  
Institutional Choice ◽  
Democratic Process ◽  
Strong Case ◽  
The Subject ◽  
The Relationship

Pragmatism and its consequences are central issues in American politics today, yet scholars rarely examine in detail the relationship between pragmatism and politics. This book systematically explores the subject and makes a strong case for adopting a pragmatist approach to democratic politics—and for giving priority to democracy in the process of selecting and reforming political institutions. What is the primary value of democracy? When should we make decisions democratically and when should we rely on markets? And when should we accept the decisions of unelected officials, such as judges or bureaucrats? This book explores how a commitment to pragmatism should affect our answers to such important questions. It concludes that democracy is a good way of determining how these kinds of decisions should be made—even if what the democratic process determines is that not all decisions should be made democratically. So, for example, the democratically elected U.S. Congress may legitimately remove monetary policy from democratic decision-making by putting it under the control of the Federal Reserve. This book argues that pragmatism offers an original and compelling justification of democracy in terms of the unique contributions democratic institutions can make to processes of institutional choice. This focus highlights the important role that democracy plays, not in achieving consensus or commonality, but rather in addressing conflicts. Indeed, the book suggest that democratic politics is perhaps best seen less as a way of reaching consensus or agreement than as a way of structuring the terms of persistent disagreement.

Zur Pragmatik und Grammatik der Wissenschaftskommunikation. Ein Modellierungsvorschlag

Fachsprache ◽  
2017 ◽  
Vol 33 (1-2) ◽  
pp. 36-60
Author(s):  
Mathilde Hennig ◽  
Dániel Czicza
Keyword(s):  
Language Variation ◽  
Common Language ◽  
Passive Voice ◽  
The Subject ◽  
The Relationship ◽  
Communication In Science

The article aims to examine grammatical features and pragmatic concerns of communicating in the sciences. In the research of certain languages, it became common to explaingrammatical features such as the usage of passive voice and nominal structures by communication requirements such as objectivity and precision. With the assumption that communication in science is designed to help gain and spread new insight, the authors tried to integrate several approaches to pragmatic and grammatical features of communication. By discussing the relationship between the grammar of certain languages and of the corresponding common language, the article also places the subject of communication in the sciences in the discipline of language variation.

Learning Language Levels in Students Accurate with a History Academic Achievement History

2017 ◽  
Vol 1 (2) ◽  
pp. 137
Author(s):  
Noorlela Binti Noordin ◽  
Abdul Razaq Ahmad ◽  
Anuar Ahmad
Keyword(s):  
Academic Achievement ◽  
Statistical Inference ◽  
Quantitative Data ◽  
Quantitative Methods ◽  
Descriptive Statistics ◽  
Language Test ◽  
The Subject ◽  
The Difference ◽  
Learning Language ◽  
The Relationship

This study was aimed to evaluate the Malay proficiency among students in Form Two especially non-Malay students and its relationship to academic achievement History. To achieve the purpose of the study there are two objectives, the first is to look at the difference between mean of Malay Language test influences min of academic achievement of History subject among non-Malay students in Form Two and the second is the relationship between the level of Malay proficiency and their academic achievement for History. This study used quantitative methods, which involved 100 people of Form Two non-Malay students in one of the schools in Klang, Selangor. This study used quantitative data were analyzed using descriptive statistics and statistical inference with IBM SPSS Statistics v22 software. This study found that there was a relationship between the proficiency of Malay language among non-Malay students with achievements in the subject of History. The implications of this study are discussed in this article.

Educación y valores

2014 ◽  
pp. 83
Author(s):  
Sabino de Juan López
Keyword(s):  
Key Words ◽  
A Priori ◽  
Palabras Clave ◽  
The Subject ◽  
The Relationship ◽  
Problem Of The Criterion

RESUMEN En el artículo se ofrece una reflexión en torno a la educación y valores. Tras una referencia a los diferentes sentidos en que se puede plantear el problema en función de la forma como se puede entender la relación entre los dos sustantivos “educación” y “valores”, la reflexión se centra en algunos problemas relacionados con los valores en cuanto contenidos de la educación. Primeramente se refiere al problema del criterio en función del cual determinar los valores de la educación, concluyendo en que el criterio no podía ser ni de carácter a priori, ni empírico, sino “sintético”. A continuación, se afronta el problema del principio, de la fuente de los valores, o la concreción del criterio de los valores de la educación, entendiendo que éstos deberían ser determinados a partir del sujeto de la educación. Se concluye con la referencia a una exigencia de los valores de la educación, la configuración de una totalidad unitaria e interactiva. Palabras clave: educación, valores, fuente de valores, integración, cultura EDUCATION AND VALUES ABSTRACT The article offers a reflection on education and values. After a reference to the different senses in which one can pose the problem in terms of how you can understand the relationship between the two nouns “education” and “values”, reflection focuses on some problems related to the values in the contents of education. First, it concerns the problem of the criterion against which to determine the values of education, concluding that the criterion could be neither a priori in nature, not empirical, but “synthetic”. Herein, the problem of principle is faced, the source of values, or the realization of the criterion of the values of education, understanding that these should be determined from the subject of education. It concludes with the reference of a requirement of the values in education, setting up a unitary and interactive whole. Key Words: education, values , power values , integration, culture

Sign in / Sign up

Export Citation Format

Share Document