The Role of the Second Oblique in the Poggendorff Illusion

Perception ◽  
1981 ◽  
Vol 10 (6) ◽  
pp. 605-614 ◽  
Author(s):  
Peter Wenderoth
Keyword(s):  
Visual Processing ◽  
Poggendorff Illusion ◽  
Oblique Line ◽  
Relative Importance ◽  
Illusion Figure ◽  
Cast Doubt

It has been observed previously in the classic Poggendorff illusion figure that the end of the oblique line which abuts onto the vertical parallel appears more misaligned than its free end. Various theories suggest that angular distortions are largest at the point of abutment. Two experiments are reported which, however, suggest that, compared to displays in which a single dot is aligned with an oblique line, the introduction of a second, parallel oblique segment does not increase errors more at the abutting tip than at the free end, but, rather, reduces them more at the free end. These results not only cast doubt on the relative importance of angular effects alone in the classic Poggendorff display, but also emphasise the complexity of that figure as a tool in the investigation of visual processing.

The Poggendorff Illusion with Subjective Contours

1977 ◽  
Vol 29 (2) ◽  
pp. 219-226 ◽  
Author(s):  
R. H. Day ◽  
R. G. Dickinson ◽  
M. K. Jory
Keyword(s):  
Poggendorff Illusion ◽  
Oblique Line ◽  
The Other ◽  
Misalignment Effect

Gregory (1972) has claimed that the Poggendorff misalignment effect occurs when the collinear obliques are separated by subjective rather than real contours. He used two figures to demonstrate this variant of the illusion. Two experiments to test the claim are reported. The first showed that apparent misalignment in one of the two original figures is no greater than that with two obliques alone (the oblique line effect), but misalignment in the other is greater than with two oblique lines and than with a control without subjective contours. The second experiment showed that apparent misalignment in the second figure was less than in two control figures without subjective contours. Since this reduced effect was probably due to the nature of the intersection between the oblique and a semi-circular element, the role of subjective contours remains unsettled.

Top-Down Processing and Visual Reorientation Illusions in a Virtual Reality Environment

2004 ◽  
Vol 63 (3) ◽  
pp. 143-149 ◽  
Author(s):  
Fred W. Mast ◽  
Charles M. Oman
Keyword(s):  
Virtual Reality ◽  
Visual Processing ◽  
Line Length ◽  
Perceptual Cues ◽  
Virtual Reality Environment ◽  
Top Down ◽  
Test Conditions ◽  
The Subject ◽  
Processing Mechanisms

The role of top-down processing on the horizontal-vertical line length illusion was examined by means of an ambiguous room with dual visual verticals. In one of the test conditions, the subjects were cued to one of the two verticals and were instructed to cognitively reassign the apparent vertical to the cued orientation. When they have mentally adjusted their perception, two lines in a plus sign configuration appeared and the subjects had to evaluate which line was longer. The results showed that the line length appeared longer when it was aligned with the direction of the vertical currently perceived by the subject. This study provides a demonstration that top-down processing influences lower level visual processing mechanisms. In another test condition, the subjects had all perceptual cues available and the influence was even stronger.

Andrew Lang and Scottish Historiography: Taking on Tradition

2015 ◽  
Vol 94 (2) ◽  
pp. 207-236 ◽  
Author(s):  
Catriona M. M. Macdonald
Keyword(s):  
Nineteenth Century ◽  
Sir Walter Scott ◽  
Scientific Methods ◽  
European Context ◽  
The Reformation ◽  
Cast Doubt ◽  
Scottish History ◽  
University Setting ◽  
Andrew Lang

The career and posthumous reputation of Andrew Lang (1844–1912) call into question Scottish historiographical conventions of the era following the death of Sir Walter Scott which foreground the apparent triumph of scientific methods over Romance and the professionalisation of the discipline within a university setting. Taking issue with the premise of notions relating to the Strange Death of Scottish History in the mid-nineteenth century, it is proposed that perceptions of Scottish historiographical exceptionalism in a European context and presumptions of Scottish inferiorism stand in need of re-assessment. By offering alternative readings of the reformation, by uncoupling unionism from whiggism, by reaffirming the role of Romance in ‘serious’ Scottish history, and by disrupting distinctions between whig and Jacobite, the historical works and the surviving personal papers of Andrew Lang cast doubt on many conventional grand narratives and the paradigms conventionally used to make sense of Scottish historiography.

Population Control (Review Article)

1961 ◽  
Vol 1 (3) ◽  
pp. 89-98
Author(s):  
Karol J. Krotki
Keyword(s):  
Population Control ◽  
Review Article ◽  
Small Enterprise ◽  
Opportunity Costs ◽  
Relative Importance ◽  
Factual Information ◽  
Undue Influence ◽  
Clear Cut ◽  
Economic Considerations

Discussions about the role of small enterprise in economic development tend to remain inconclusive partly because of the difficulty of assessing the relative importance of economic and non-economic objectives and partly because of the dearth of factual information on which to base an economic calculus. It is probably true, moreover, that, because of a lack of general agreement as to the economic case for or against small enterprise, non-economic considerations, including some merely romantic attitudes toward smallness and bigness, tend to exert an undue influence on public policies. There may, of course, be no clear-cut economic case. And noneconomic considerations should and will inevitably weigh significantly in policy decisions. If, however, some of the economic questions could be settled by more and better knowledge, these decisions could more accurately reflect the opportunity costs of pursuing non-economic objectives.

The Role of Attention in Visual Processing

1991 ◽  
Author(s):  
Gordon Shulman
Keyword(s):  
Visual Processing

scholarly journals Role of propagule pressure in colonization success: disentangling the relative importance of demographic, genetic and habitat effects

2013 ◽  
Vol 26 (8) ◽  
pp. 1691-1699 ◽  
Author(s):  
R. A. Hufbauer ◽  
A. Rutschmann ◽  
B. Serrate ◽  
H. Vermeil de Conchard ◽  
B. Facon
Keyword(s):  
Propagule Pressure ◽  
Relative Importance ◽  
Colonization Success

Sports News, Commentary and Interviews, From the Other Side: Journalists Seen Through the Eyes of Athletes

2021 ◽  
pp. 216747952199237
Author(s):  
Ondřej Trunečka
Keyword(s):  
Athletic Performance ◽  
The Other ◽  
Professional Athletes ◽  
Main Role ◽  
Cast Doubt ◽  
The Media ◽  
Sports News

This study explores how professional athletes perceive sports journalists and the role of the media. They acknowledge that communication with journalists is an essential part of their profession and appreciate the verified information, knowledge, and dutiful preparation. They consider the main role of media as monitorial. In some cases, they cast doubt on journalists’ ability to evaluate athletic performance accurately, and they are also critical of errors in interviews, however they acknowledgethat there are good, and possibly excellent journalists as well.

Industrial Policy and Local Economic Transformation: Evidence From the U.S. Rust Belt

2021 ◽  
pp. 089124242110228
Author(s):  
Ben Armstrong
Keyword(s):  
Industrial Policy ◽  
Local Governments ◽  
State Level ◽  
Economic Transformation ◽  
Local Economy ◽  
Rust Belt ◽  
Industrial Policies ◽  
Cast Doubt ◽  
State And Local

State and local governments frequently invest in policies aimed at stimulating the growth of new industries, but studies of industrial policy and related economic development initiatives cast doubt on their effectiveness. This article examines the role of state-level industrial policies in contributing to the different economic trajectories of two U.S. metro areas—Pittsburgh, Pennsylvania, and Cleveland, Ohio—as they adapted to the decline of their legacy industries. Comparative case studies show that industrial policies in Pittsburgh, which empowered research universities as local economic leaders, contributed to the transformation of the local economy. In Cleveland, by contrast, state industrial policies invested in making incremental improvements, particularly in legacy sectors. The article concludes that by empowering new local economic actors—such as universities—industrial policies can foment political change that enables structural economic change to follow.

scholarly journals The Arctic as a “Strategic” and “Important” Chinese Foreign Policy Interest: Exploring the Role of Labels and Hierarchies in China’s Arctic Discourses

2021 ◽  
pp. 186810262110186
Author(s):  
Patrik Andersson
Keyword(s):  
Foreign Policy ◽  
International Relations ◽  
Political Discourse ◽  
Chinese Foreign Policy ◽  
The Arctic ◽  
Relative Importance ◽  
Precise Understanding ◽  
New Frontier ◽  
Political Priority

Research confirms that China is becoming more engaged in the Arctic. However, international relations scholarship often extrapolates from relatively few instances of activity to wide-ranging claims about Chinese priorities. Fortunately, Chinese political discourse is organised by labels that allow us to study how the Arctic is classified and ranked along China’s other foreign policy priorities. This article analyses two such classifications – “important maritime interest” and “strategic new frontier,” exploring how they have come about, what they mean, and how they add political priority to the Arctic. It argues that hierarchies are constructed in two ways: by adding gradients and by including/excluding categories of priority. It views categories as performative: they not only convey information about character and relative importance of interests but are also used for achieving different objectives. By focusing on foreign policy classifications, the article contributes to a more nuanced and precise understanding of China’s Arctic interests.

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