Whole-field integration, not detailed analysis, is used by the crab optokinetic system to separate rotation and translation in optic flow

1997 ◽  
Vol 181 (4) ◽  
pp. 383-392 ◽  
Author(s):  
H. Blanke ◽  
H.-O. Nalbach ◽  
D. Varju
Keyword(s):  
Detailed Analysis ◽  
Optic Flow ◽  
Optokinetic System

scholarly journals Budgerigars adopt robust, but idiosyncratic flight paths

2019 ◽  
Author(s):  
Debajyoti Karmaker ◽  
Ingo Schiffner ◽  
Mandyam V. Srinivasan
Keyword(s):  
Detailed Analysis ◽  
Obstacle Avoidance ◽  
Optic Flow ◽  
High Speed ◽  
Care Needs ◽  
Maximum Value ◽  
High Propensity ◽  
Avoidance Manoeuvre ◽  
Minimal Deviation ◽  
Flight Trajectories

AbstractWe have investigated the paths taken by Budgerigars while flying in a tunnel. The preferred flight trajectories of nine Budgerigars (Melopsittacus undulatus) were reconstructed in 3D from high speed stereo videography of their flights in an obstacle-free tunnel. Individual birds displayed highly idiosyncratic flight trajectories that were consistent from flight to flight over the course of several months. We then investigated the robustness of each bird’s trajectory by interposing a disk-shaped obstacle in its preferred flight path. We found that each bird continued to fly along its preferred trajectory up to a point very close to the obstacle before veering away rapidly, making a minimal deviation to avoid a collision, and subsequently returning to its original path. Thus, Budgerigars show a high propensity to stick to their individual, preferred flight paths even when confronted with a clearly visible obstacle, and do not adopt a substantially different, safer route. Detailed analysis of the last-minute avoidance manoeuvre suggests that a collision is avoided by restricting the magnitude of the optic flow generated by the obstacle to a maximum value of about 700 deg/sec. The robust preference for idiosyncratic flight paths, and the tendency to pass obstacles by flying above them, provide new insights into the strategies that underpin obstacle avoidance in birds. It could also have wide-ranging implications for conservation efforts to mitigate collisions of birds with man-made obstacles – especially obstacles that are poorly visible, such as wind turbines or buildings with glass facades. Our findings indicate that care needs to be exercised to ensure that newly planned structures are not located near major bird flyways, wherever possible, and to ensure that the positioning takes into consideration the cues and behaviours that birds use to avoid such obstacles.

Decoding of Optic Flow by the Primate Optokinetic System

1992 ◽  
pp. 471-478 ◽  
Author(s):  
Frederick A. Miles ◽  
Urs Schwarz ◽  
Claudio Busettini
Keyword(s):  
Optic Flow ◽  
Optokinetic System

Prosodic Impairment Associated With Traumatic Brain Injury

2009 ◽  
Vol 19 (3) ◽  
pp. 97-102
Author(s):  
Billy Irwin
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Detailed Analysis ◽  
Acoustic Characteristics ◽  
Individual Variations

Abstract Purpose: This article discusses impaired prosody production subsequent to traumatic brain injury (TBI). Prosody may affect naturalness and intelligibility of speech significantly, often for the long term, and TBI may result in a variety of impairments. Method: Intonation, rate, and stress production are discussed in terms of the perceptual, physiological, and acoustic characteristics associated with TBI. Results and Conclusions: All aspects of prosodic production are susceptible to the effects of damage resulting from TBI. There are commonly associated prosodic impairments; however, individual variations in specific aspects of prosody require detailed analysis.

Assessment of the state and level of development of public-private partnership projects in the subjects of the Russian Federation

2018 ◽  
pp. 131-141 ◽  
Author(s):  
A. N. Savrukov ◽  
N. T. Savrukov ◽  
E. A. Kozlovskaya
Keyword(s):  
Detailed Analysis ◽  
Russian Federation ◽  
Significant Proportion ◽  
Transport Sector ◽  
Private Partnership ◽  
Current State ◽  
Central Regions ◽  
The Russian Federation ◽  
Project Data ◽  
Municipal Level

The article analyzes the current state and level of development of publicprivate partnership (PPP) projects in the subjects of the Russian Federation. The authors conclude that a significant proportion of projects is implemented on a concession basis at the municipal level in the communal sphere. A detailed analysis of the project data showed that the structure of the projects is deformed in favor of the central regions of the Russian Federation, and a significant share in the total amount of financing falls on the transport sector. At the stage of assessing the level of development by the subjects of the Russian Federation, criteria were proposed, and index and integral indicators were used, which ensured comparability of the estimates obtained. At the end of the analysis, the regions were ranked and clustered according to the level of PPP development, which allowed to reveal the number and structure of leaders and outsiders.

To Understand the Informal (on the Book BY V. L. Tambovtsev “Economics of Informal Institutions”)

2015 ◽  
pp. 151-158
Author(s):  
A. Zaostrovtsev
Keyword(s):  
Social Psychology ◽  
Detailed Analysis ◽  
Human Behavior ◽  
Interdisciplinary Approach ◽  
Informal Institutions ◽  
Economic Thought ◽  
History Of ◽  
Original Classification

The review considers the first attempt in the history of Russian economic thought to give a detailed analysis of informal institutions (IF). It recognizes that in general it was successful: the reader gets acquainted with the original classification of institutions (including informal ones) and their genesis. According to the reviewer the best achievement of the author is his interdisciplinary approach to the study of problems and, moreover, his bias on the achievements of social psychology because the model of human behavior in the economic mainstream is rather primitive. The book makes evident that namely this model limits the ability of economists to analyze IF. The reviewer also shares the author’s position that in the analysis of the IF genesis the economists should highlight the uncertainty and reject economic determinism. Further discussion of IF is hardly possible without referring to this book.

The Impact of Property Characteristics on Economic Performance of Russian Industrial Enterprises

2005 ◽  
pp. 53-68 ◽  
Author(s):  
R. Kapeliushnikov ◽  
N. Demina
Keyword(s):  
Detailed Analysis ◽  
Economic Performance ◽  
Ownership Concentration ◽  
Corporate Sector ◽  
Concentrated Ownership ◽  
Industrial Enterprises ◽  
Russian Industry ◽  
Control Premium ◽  
And Performance ◽  
The Impact

The paper provides new survey evidence on effects of concentrated ownership upon investment and performance in Russian industrial enterprises. Authors trace major changes in their ownership profile, assess pace of post-privatization redistribution of shareholdings and provide evidence on ownership concentration in the Russian industry. The major econometric findings are that the first largest shareholding is negatively associated with the firm’s investment and performance but surprisingly the second largest shareholding is positively associated with them. Moreover, these relationships do not depend on identity of majority shareholders. These results are consistent with the assumption that the entrenched controlling owners are engaged in extracting "control premium" but sizable shareholdings accumulated by other blockholders may put brakes on their expropriating behavior and thus be conductive for efficiency enhancing. The most interesting topic for further more detailed analysis is formation, stability and roles of coalitions of large blockholders in the corporate sector of post-socialist countries.

On the Margins of Modernism

2017 ◽  
Author(s):  
Christopher Rosenmeier
Keyword(s):  
Short Stories ◽  
Detailed Analysis ◽  
Chinese Literature ◽  
Popular Literature ◽  
Extensive Study ◽  
Wide Range ◽  
Chinese Fiction ◽  
Scant Attention ◽  
Narrative Techniques ◽  
Chinese Writing

Xu Xu and Wumingshi were among the most widely read authors in China during and after the Second Sino-Japanese War (1937–1945). Despite being an integral part of the Chinese literary scene, their bestselling fiction has, however, been given scant attention in histories of Chinese writing. This book is the first extensive study of Xu Xu and Wumingshi in English or any other Western language and it re-establishes their importance within the popular Chinese literature of the 1940s. Their romantic novels and short stories were often set abroad and featured a wide range of stereotypes, from pirates, spies and patriotic soldiers to ghosts, spirits and exotic women who confounded the mostly cosmopolitan male protagonists. Christopher Rosenmeier’s detailed analysis of these popular novels and short stories shows that such romances broke new ground by incorporating and adapting narrative techniques and themes from the Shanghai modernist writers of the 1930s, notably Shi Zhecun and Mu Shiying. The study thereby contests the view that modernism had little lasting impact on Chinese fiction, and it demonstrates that the popular literature of the 1940s was more innovative than usually imagined, with authors, such as those studied here, successfully crossing the boundaries between the popular and the elite, as well as between romanticism and modernism, in their bestselling works.

‘BLAST First (from politeness) ENGLAND’: The Manifesto in Britain and Ireland

2017 ◽  
Vol 12 (2) ◽  
pp. 297-315 ◽  
Author(s):  
Julian Hanna
Keyword(s):  
Detailed Analysis ◽  
Virginia Woolf ◽  
Ezra Pound ◽  
Wyndham Lewis ◽  
Italian Futurism ◽  
Free Zone ◽  
Hugh Macdiarmid ◽  
The Times

Aside from the familiar story of Vorticists and Imagists before the war, no detailed analysis of manifestos in Britain (or Ireland) exists. It is true that, by 1914, there had been such an upsurge in manifesto writing that a review of BLAST in The Times (1 July 1914) began: ‘The art of the present day seems to be exhausting its energies in “manifestoes.”’ But after the brief fire ignited by the arrival of Italian Futurism died out, Britain again became a manifesto-free zone. Or did it? While a mania for the militant genre did not take hold in Britain and Ireland the same way it did in France, Italy, Germany, or Russia, the manifesto did enjoy a small but dedicated following that included Whistler, Wilde, and Yeats; Patrick Geddes and Hugh MacDiarmid; Wyndham Lewis and Ezra Pound; Dora Marsden and Virginia Woolf; and Auden, MacNeice, and Spender. Through these and other figures it is possible to trace the development of a manifesto tradition specific to Britain and Ireland.

El concepto de tiranía en la obra de Antonio de Guevara

Moreana ◽  
2012 ◽  
Vol 49 (Number 189- (3-4) ◽  
pp. 21-40
Author(s):  
Eduardo A. Salas Romo
Keyword(s):  
Sixteenth Century ◽  
Detailed Analysis ◽  
New Meanings ◽  
European Renaissance

The aim of this paper is to elucidate a particular vision of the concept of tyranny as presented in the works of Antonio de Guevara (c.1480-1545), one of the most distinguished and influential Spanish scholars in the Sixteenth Century. Guevara contributed to the shaping of many meaningful terms and ideas that kindled the cultural ambiance of his days. Furthermore, this Spaniard’s writings establish a dialogue with the works by the leading figures of the European Renaissance, such as More’s Utopia, Erasmus’ Institutio principis christiani or The Courtier by Castiglione. The detailed analysis of Guevara’s texts will show how the Renaissance revitalized Classical motifs instilling into them new meanings. This is the case, for example, in the case of genres such as the Specula (Principis or Militis). Guevara claims for a proper education for both the prince and the court, concluding that sovereignty must be properly supported by the ethical (or even intellectual) principles of the monarch.

Sign in / Sign up

Export Citation Format

Share Document