Visual Search for Global and Local Stimulus Features

Perception ◽  
1994 ◽  
Vol 23 (2) ◽  
pp. 237-243 ◽  
Author(s):  
Jukka Saarinen
Keyword(s):  
Oblique Line ◽  
Search Time ◽  
Global Scale ◽  
Local Scale ◽  
Global Precedence ◽  
Target Pattern ◽  
Line Segments ◽  
Local Stimulus ◽  
Stimulus Features ◽  
Global And Local

The observer looked for a target pattern differing from distractors in orientation at one spatial scale only (either at a global or at a local scale) and ignored the other. The stimulus patterns in the search array were vertical or horizontal bars consisting of four oblique line segments sharing the same orientation (45° or 135°). In the search at the global scale, the target and distractors differed from each other in the bar orientation, but not in the orientation of the line segments, which was random. In the search at the local scale, the observer had to use the line orientation for discriminating the target and distractors (the bar orientation was random). The results showed that even though the search was parallel at both scales (ie the search time did not increase with an increasing number of distractors), target detection at the local scale required considerably more time than at the global scale. This latter finding is in agreement with the phenomenon of ‘global precedence’.

scholarly journals Global‐ and Local‐Scale High‐Resolution Event Catalogs for Algorithm Testing

2019 ◽  
Author(s):  
Lisa Linville ◽  
Ronald Chip Brogan ◽  
Christopher Young ◽  
Katherine Anderson Aur
Keyword(s):  
Global Scale ◽  
Local Scale ◽  
Algorithm Performance ◽  
Directional Information ◽  
Event Sequences ◽  
University Of Utah ◽  
International Monitoring ◽  
Using Data ◽  
The University ◽  
Global And Local

ABSTRACT During the development of new seismic data processing methods, the verification of potential events and associated signals can present a nontrivial obstacle to the assessment of algorithm performance, especially as detection thresholds are lowered, resulting in the inclusion of significantly more anthropogenic signals. Here, we present two 14 day seismic event catalogs, a local‐scale catalog developed using data from the University of Utah Seismograph Stations network, and a global‐scale catalog developed using data from the International Monitoring System. Each catalog was built manually to comprehensively identify events from all sources that were locatable using phase arrival timing and directional information from seismic network stations, resulting in significant increases compared to existing catalogs. The new catalogs additionally contain challenging event sequences (prolific aftershocks and small events at the detection and location threshold) and novel event types and sources (e.g., infrasound only events and long‐wall mining events) that make them useful for algorithm testing and development, as well as valuable for the unique tectonic and anthropogenic event sequences they contain.

Cyber Bullying

2019 ◽  
pp. 379-401
Author(s):  
Emıne Nılufer Pembecıoglu ◽  
Hatıce Irmaklı
Keyword(s):  
Current Literature ◽  
Intervention Program ◽  
Global Scale ◽  
Local Scale ◽  
Cyber Bullying ◽  
General Overview ◽  
Local Practices ◽  
Technological Improvements ◽  
Global And Local ◽  
Insight Into

Cyber bullying is a serious and newly arising problem of today's world due to the negative intentions in using the recent technological improvements. However, despite its being a relatively new area, a significant number of studies conducted on this issue can be found. This chapter provides a general overview of the current literature with exemplary research to present some insight into the global and local practices in relation to any possible solution of prevention/intervention program for the cyber bullying problem. The global scale involves many studies of various scholars from several countries with different focuses while the local scale concentrates on the case of Turkey and the same of Turkish students or teachers.

Cyber Bullying

2020 ◽  
pp. 155-184
Author(s):  
Emıne Nılufer Pembecıoglu ◽  
Hatıce Irmaklı
Keyword(s):  
Current Literature ◽  
Intervention Program ◽  
Global Scale ◽  
Local Scale ◽  
Cyber Bullying ◽  
General Overview ◽  
Local Practices ◽  
Technological Improvements ◽  
Global And Local ◽  
Insight Into

Cyber bullying is a serious and newly arising problem of today's world due to the negative intentions in using the recent technological improvements. However, despite its being a relatively new area, a significant number of studies conducted on this issue can be found. This chapter provides a general overview of the current literature with exemplary research to present some insight into the global and local practices in relation to any possible solution of prevention/intervention program for the cyber bullying problem. The global scale involves many studies of various scholars from several countries with different focuses while the local scale concentrates on the case of Turkey and the same of Turkish students or teachers.

scholarly journals How emissions from cruise ships in the port of Naples changed in the COVID-19 lock down period

2021 ◽  
pp. 147509022110284
Author(s):  
Luigia Mocerino ◽  
Franco Quaranta
Keyword(s):  
Local Scale ◽  
The Other ◽  
Cruise Ships ◽  
Global Pandemic ◽  
Transportation Sector ◽  
Reduction Of Emissions ◽  
The One ◽  
Global And Local

The scope of this work is to try to quantify the reduction of emissions due to COVID-19; an analysis covering the entire port of Naples will be presented. The explosion of the global pandemic from SARS-CoV-2 led to the adoption of local and global countermeasures aimed at containing contagions. The transportation sector, and in particular the passenger moving sector, was deeply affected; this almost total block of movements between regions and countries if, on the one hand, seriously slowed the economy, on the other, it drastically reduced the emissions on a global and local scale. In this work, the case study of the cruise ships berthed at the Maritime Station (Stazione Marittima) in the port of Naples is examined. The traffic of cruise ships during the lockdown and in the immediately following months was analysed and compared first with respect to the calendars scheduled for the same period and then with respect to the same months of 2019. The reduction in number of cruise ships and passengers were analysed and compared to the previous trends. The vessels collected, for 2019 and 2020 (both those that arrived and those that suffered the effects of the movement block) were subsequently characterized in terms of power and speed. Finally, an estimate of the emissions of NOX, SOX, CO2 produced and saved was carried out. The 2020 results will be compared with the hypothetical emissions that would have occurred in the absence of the lockdown and with those of the same period of the previous year.

Transitional Justice

2018 ◽  
pp. 152-165
Author(s):  
Susanne Buckley-Zistel
Keyword(s):  
Transitional Justice ◽  
Global Scale ◽  
Cultural Preferences ◽  
Historical Developments ◽  
Global And Local ◽  
Normative Foundations ◽  
National Local

Reading transitional justice through IPT requires investigating if and how its notion of justice is embedded in particular normative frameworks, as well as how it relates global and local understandings of justice. The chapter thus analyses what ideas of justice underlie the concept of transitional justice and its application in societies of transition. One central contention is that its normative foundations are the result of historical developments as well as cultural preferences, and reflect a series of beliefs which are sometimes in conflict. Moreover, the chapter situates transitional justice between the local and the global by connecting normative assumptions which derive from a concrete locality with concepts at a global scale, and vice versa. This is in line with the concerns of IPT (moving the discussion of justice from the national to the global), but it also questions the meaning of the scales national (local)/global in and of themselves.

Networks of Photos, Landmarks, and People

Leonardo ◽  
2011 ◽  
Vol 44 (3) ◽  
pp. 240-243 ◽  
Author(s):  
David Crandall ◽  
Noah Snavely
Keyword(s):  
Recent Work ◽  
Human Behavior ◽  
Visual Representations ◽  
3D Models ◽  
Global Scale ◽  
Local Scale ◽  
Photo Sharing ◽  
The World ◽  
Vantage Points ◽  
Combining Information

Social photo-sharing sites like Flickr contain vast amounts of latent information about the world and human behavior. The authors describe their recent work in building automatic algorithms that analyze large collections of imagery in order to extract some of this information. At a global scale, geo-tagged photographs can be used to identify the most photographed places on Earth, as well as to infer the names and visual representations of these places. At a local scale, the authors build detailed 3D models of a scene by combining information from thousands of 2D photographs taken by different people and from different vantage points.

How Many Trees Does it Take to Make a Forest?

Perception ◽  
1983 ◽  
Vol 12 (3) ◽  
pp. 239-254 ◽  
Author(s):  
David Navon
Keyword(s):  
Local Features ◽  
Global Precedence ◽  
The Times ◽  
Global And Local

In order to study the relative perceptual availability of global and local features in very sparse patterns, subjects were asked to make ‘same’/‘different’ judgments on pairs of geometrical figures and the times needed to detect global and local differences were compared. With triangular patterns a global precedence was found which could be attributed to size differences. With rectangular patterns global precedence was larger, not accounted for by size differences, and indifferent both to the number of elements and to their spacing. Thus it was demonstrated that global precedence may hold for patterns with as few as four elements. Patterns with smooth edges could be compared much more quickly than patterns with serrated eges. It is proposed that configurational properties of some of the patterns interfered with the encoding of their global structures or with comparing them. It is argued that the results support a principle of global addressability which postulates that visual schemata are mainly addressed through their global constituents.

Sign in / Sign up

Export Citation Format

Share Document