Stereokinetic Effects with Sharp and Fuzzy Illusory Contours

Perception ◽  
1994 ◽  
Vol 23 (12) ◽  
pp. 1437-1445
Author(s):  
Roberto Masini ◽  
Mario Ferraro ◽  
Tommaso Costa
Keyword(s):  
The Other ◽  
Vector Model ◽  
Rotating Disc ◽  
Vertical Orientation ◽  
Centre Of Gravity ◽  
Tentative Explanation ◽  
Different Dimensions ◽  
Stereokinetic Effect ◽  
Shaped Pattern ◽  
Independent Motion

A black, 8-shaped pattern, whose centre of gravity is in the centre of a rotating disc, appears to split into two black discs rotating with phenomenal independent motion, orientation stability, and sliding of one on the other. The type of observed movement, the order of overlapping, and the extent of the stereokinetic depth in relation to the contour type and different dimensions of the pattern were investigated. The experimental data show that a fuzzy contour facilitates the stereokinetic effect. Furthermore, the extent of the stereokinetic depth has been found to be greater in case of fuzzy contour and vertical orientation of the pattern. These results are in contrast with the models in which this effect is considered as a problem of minimisation of distances or velocities. A vector model of the observed movement and an interpretation of the overlapping based on an energy approach are proposed. A tentative explanation of the stereokinetic depth for our patterns is put forward.

The Oppel–Kundt Illusion and Its Relation to Horizontal-Vertical and Oblique Effects

Perception ◽  
2021 ◽  
pp. 030100662110065
Author(s):  
Klaus Landwehr
Keyword(s):  
Oblique Effect ◽  
The Other ◽  
Vertical Orientation ◽  
Horizontal Orientation ◽  
Full Circle ◽  
Original Stimulus ◽  
Vertical Part

The Oppel–Kundt illusion consists in the overestimation of the length of filled versus empty extents. Two experiments explored its relation to the horizontal-vertical illusion, which consists in the overestimation of the length of vertical versus horizontal extents, and to the oblique effect, which consists in poorer discriminative sensitivity for obliquely as opposed to horizontally or vertically oriented stimuli. For Experiment 1, Kundt’s (1863) original stimulus was rotated in steps of 45° full circle around 360°. For Experiment 2, one part of the stimulus remained at a horizontal or vertical orientation, whereas the other part was tilted 45° or 90°. The Oppel–Kundt illusion was at its maximum at a horizontal orientation of the stimulus. The illusion was strongly attenuated with L-type figures when the vertical part was empty, but not enhanced when this part was filled, suggesting that the horizontal-vertical illusion only acts on nontextured extents. There was no oblique effect.

The Extrusion Rate of Grommets

1985 ◽  
Vol 93 (6) ◽  
pp. 695-699 ◽  
Author(s):  
Alan G. Gibb ◽  
Ian J. Mackenzie
Keyword(s):  
The Other ◽  
Significant Determinant ◽  
Extrusion Rate ◽  
Factors Influencing ◽  
Tympanostomy Tubes ◽  
Position Type ◽  
Definite Pattern ◽  
Different Dimensions ◽  
A Prospective Study

A prospective study was performed to determine the factors Influencing the extrusion rate of tympanostomy tubes. Nine hundred thirty-nine tubes were inserted In 589 patients and the extrusion of these tubes was reviewed up to a period of 27 months. The eight tubes used in the survey were the Shepard, Exmoor, Bobbin, Armstrong, Paparella, Shah, Arrow, and collar button. These tubes were inserted In strict rotation, the operator using the designated tube. The position, type of incision, presence of fluid, quality of tympanic membrane, and degree of difficulty of insertion were all recorded at operation. The sex, age, side of operation, and any simultaneous operative procedures were also recorded. The patients were reviewed the day after operation and then every 3 months thereafter until the tube was extruded. A definite pattern was Identified for the extrusion of each type of tube. At one end of the spectrum, Exmoor and Shepard tubes were, for the most part, extruded between 6 and 9 months after Insertion, while at the other end, most of the collar button tubes were still functioning at 18 months. The design of the tube was the only factor found to be a significant determinant of the extrusion of the tube, although the experience of the surgeon affected the extrusion rate of the Arrow tube. The different dimensions of the Exmoor and collar button tubes are examined and compared.

US-Taliban Peace Agreement: A Study of Economic and Strategic Implications for Pakistan

2020 ◽  
Vol 3 (2) ◽  
pp. 158-168
Author(s):  
Asif Salim ◽  
Raid Khan ◽  
Zikriya
Keyword(s):  
Empirical Data ◽  
Popular Literature ◽  
The Other ◽  
Policy Recommendations ◽  
Peace Agreement ◽  
Economic Implications ◽  
Internal Politics ◽  
The Us ◽  
Different Dimensions ◽  
External Actors

The competition among the regional stake-holders cannot be neglected because they can sabotage the peace process by delaying the focused intra-afghan dialogue. It is, therefore, argued that only Afghans can dilute the influence of external actors and keep them away from interfering in the internal politics of Afghanistan. Without the active participation of Pakistan objectives for durable and long-standing peace cannot be achieved. Pakistan not only provided its good-offices for the negotiation between the parties at different forums but also influenced and persuaded the Taliban factions for negotiations. The question arises that what will be the implications of this deal on Pakistan and how it can play plank the fruitful outcomes from this deal. The results shows that the deal between the US and Taliban has deep-down strategic and economic implications on Pakistan and with better strategy Pakistan can create win-win situation for the other regional stakeholders.  Furthermore, the current research is qualitative in nature in which the empirical data and popular literature have critically analyzed to understand the peace agreement in Afghanistan with its different dimensions and perspectives. Policy recommendations are the part of discussion, however paper focuses fundamentally on possible ramifications of Doha peace deal.

Visual Storytelling as Generative Strategy for Social Educators

2019 ◽  
pp. 18-35
Author(s):  
Laura Fedeli
Keyword(s):  
Experiential Learning ◽  
The Other ◽  
Graduate Course ◽  
Educational Approach ◽  
Visual Storytelling ◽  
The Third ◽  
Different Dimensions ◽  
The University ◽  
Professional Contexts

The chapter deals with the discussion of the results of an experimentation run in two consecutive academic years within the classes of the graduate course “Instructional Technology” in the graduate course “Science of Education” at the University of Macerata, Italy. The IT course is programmed in the third year of the curriculum for “Social Educators” and the contribution reports the results of a case study related to a workshop activity in which students could find a further opportunity to identify different dimensions of relation among theoretical aspects and the potential practical/applied connotations in professional contexts. The workshop was structured as an experiential learning process in which the value of the digital storytelling as educational approach was a strategy adopted to foster the students' understanding toward the intercultural issues in terms of improvement of relationship by taking a prospective position oriented to the other.

The Notion of Approximation in Language

2017 ◽  
Vol 3 (1) ◽  
pp. 95-120 ◽  
Author(s):  
Zeki Hamawand
Keyword(s):  
Semantic Content ◽  
The State ◽  
The Other ◽  
Cognitive Semantics ◽  
Conceptual Content ◽  
The World ◽  
Different Dimensions

This paper seeks to explicate the notion of approximation in language: the state of being close or near to a desired number or amount. Approximation is used to reflect a lack of exact knowledge. This paper adopts Cognitive Semantics and attempts to apply two of its fundamental claims to the description of markers denoting approximation. One claim is that all linguistic elements posited in language have semantic content. On the basis of this claim, the paper argues that a marker of approximation has conceptual content of its own which conditions its presence in a construction. Each marker adds semantic import to the construction in which it occurs. The other claim is that the use of a lexical expression is the outcome of the specific construal imposed on a situation. On the basis of this claim, the paper argues that the uses of approximating markers represent different dimensions of construal. Each marker signals a different perspective of the speaker in describing the world. The aim is to show, based on examples, that approximating markers are not random choices. Each marker has a distinct message in the language.

On the capture of interstellar matter by stars

1940 ◽  
Vol 36 (3) ◽  
pp. 314-322 ◽  
Author(s):  
R. d'E. Atkinson
Keyword(s):  
Radial Velocity ◽  
The Other ◽  
Interstellar Matter ◽  
Centre Of Gravity ◽  
Compelling Reason ◽  
Other Hand ◽  
The Mean ◽  
The One ◽  
The Individual ◽  
Capture Radius

The derivation given by Hoyle and Lyttleton for an accretion formula proposed by them is examined. A number of arguments against its validity are put forward, especially that on the one hand their capture radius depends on the theorem that if the velocity of certain masses of gas after collision is less than the velocity of escape at the point, they will not in fact escape, while on the other hand it is clear (and is now admitted) that the gas cannot in fact move with this velocity at all. It is also shown that since, ex hypothesi, the individual molecules will all, on the average, retain their hyperbolic velocities, there is not the compelling reason for their capture that there appeared to be in Hoyle and Lyttleton's argument, where only the mean radial velocity of the centre of gravity of the mass was considered. Further, it seems improbable that the temperature of the interstellar matter can be low enough for the initial assumptions of their theory to hold.

scholarly journals Multiple Relationships of Nursing Care: the Emergence of Care "of the us"

2010 ◽  
Vol 18 (5) ◽  
pp. 895-902 ◽  
Author(s):  
Maria Aparecida Baggio ◽  
Alacoque Lorenzini Erdmann
Keyword(s):  
Self Care ◽  
The Self ◽  
The Other ◽  
University Hospital ◽  
Multiple Relationships ◽  
Care Of The Self ◽  
The Us ◽  
Different Dimensions ◽  
Nursing Professionals ◽  
Nursing Professional

The aim of this qualitative study was to comprehend the relationships of the care of the self, of care of the other, and of care "of the us" in the different dimensions of care, through an educational/reflexive/interpretative process with nursing professionals in a University Hospital, using the complexity perspective. The data were collected through workshops and submitted to content analysis. The following categories emerged: reflecting upon the meaning of care of the self, care of the other, and "of the us" for the "I - human being", and for the "I - nursing professional"; and reflecting and (re)constructing the meanings of the relationships of care for the self, care for the other, and care "for the us". The care "for the us" is an emerging theme, in construction, and impels a concern for the collective, as well as remits to the comprehension of the multiple and unending phenomenon of constant movement among the beings and between them and their environment, modifying, altering, and causing to be altered the networks of existent relationships.

Political Corruption in Central America: Assessment and Explanation

2011 ◽  
Vol 53 (01) ◽  
pp. 33-58 ◽  
Author(s):  
J. Mark Ruhl
Keyword(s):  
Latin America ◽  
Central America ◽  
Measurement Techniques ◽  
Political Corruption ◽  
Democratic Consolidation ◽  
The Other ◽  
Central American ◽  
Future Research ◽  
Different Dimensions ◽  
Statistical Indicators

AbstractAnalysts agree that political corruption is an obstacle to democratic consolidation but disagree about how to measure the extent of corruption in individual nations. This analysis of the Central American countries demonstrates that the most important competing quantitative measures of political corruption produce strikingly different rankings. These contradictory results are caused less by poor measurement techniques than by the existence of two different dimensions of corruption that do not always coincide. Statistical indicators based on expert perceptions of corruption and alternative indicators based on ordinary citizens' firsthand experiences with bribery measure, respectively, grand corruption by senior officials and petty corruption by lower-level functionaries. This study attempts to explain why several Central American nations suffer primarily from one or the other rather than both. It advances recommendations for future research and future anticorruption policies that may be applied to Latin America as a whole.

Relationship Between Volume-to-Capacity Ratios and Accident Rates

1997 ◽  
Vol 1581 (1) ◽  
pp. 47-52 ◽  
Author(s):  
Min Zhou ◽  
Virginia P. Sisiopiku
Keyword(s):  
Traffic Volume ◽  
The Other ◽  
Explanatory Factors ◽  
Traffic Conflict ◽  
Single Vehicle ◽  
Driver Inattention ◽  
Detroit Area ◽  
Accident Rates ◽  
The Relationship ◽  
Shaped Pattern

The general relationships between hourly accident rates and hourly traffic volume/capacity ( v/c) ratios were examined. A 26 km (16 mi) segment of Interstate I-94 in the Detroit area was selected as the study segment. The v/c ratios were calculated from average hourly traffic volume counts collected in 1993 and 1994 from three permanent count stations. Accident rates were derived from hourly distributed number of accidents in the same 2 years. The correlation between v/c values and accident rates follows a general U-shaped pattern. The study of all observed accidents combined indicates that accident rates are highest in the very low hourly v/c range, decrease rapidly with increasing v/c ratio, and then gradually increase as the v/c ratio continues to increase. U-shaped models also explain the relationship between v/c and accident rates for weekdays and weekend days, multivehicle, rear-end, and property-damage-only accidents. On the other hand, single-vehicle, fixed-object, and turnover accidents, and accidents involving injury and fatality follow a generally decreasing trend with increasing v/c ratio. Traffic conflict is viewed as a major contributing factor to high accident rates observed in the high v/c range, whereas night conditions and driver inattention were identified as explanatory factors for the occurrence of high accident rates in the low v/c ranges.

processPIXEL: a program to generate energy-vector models from Gavezzotti'sPIXELcalculations

2014 ◽  
Vol 47 (5) ◽  
pp. 1777-1780 ◽  
Author(s):  
Andrew D. Bond
Keyword(s):  
Crystal Structure ◽  
Intermolecular Interaction ◽  
Intermolecular Interactions ◽  
Crystal Packing ◽  
Pairwise Interaction ◽  
The Other ◽  
Vector Model ◽  
Command Line ◽  
Continuous Line ◽  
Interaction Topology

A command-line program is presented to convert the output from Gavezzotti'sPIXELcalculations to Shishkin's energy-vector models representing the intermolecular interaction topology. The output models comprise sets of vectors joining the centres of the molecules in a crystal structure, scaled so that the vector representing the most stabilizing pairwise interaction has length equal to half of the corresponding intermolecular separation. When the energy-vector model is packed, the most stabilizing pairwise interaction is represented as a continuous line between interacting molecules, while the other intermolecular interactions are shown as discontinuous lines, with a smaller gap representing a more stabilizing interaction. The energy-vector models can be overlaid on the crystal structure using theMercuryvisualizer to enable convenient visualization of structural motifs that contribute significantly to the overall crystal packing energy.

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