scholarly journals Change detection: the role of low-level versus high-level image representations

2016 ◽  
Vol 16 (12) ◽  
pp. 335
Author(s):  
Wietske Zuiderbaan ◽  
Jonathan van Leeuwen ◽  
Serge Dumoulin
Keyword(s):  
Change Detection ◽  
Low Level ◽  
Level Versus ◽  
Image Representations ◽  
High Level

Triggering of transient LES relaxations in ferrets: role of sympathetic pathways and effects of baclofen

2000 ◽  
Vol 279 (1) ◽  
pp. G157-G162 ◽  
Author(s):  
Esther Staunton ◽  
Scott D. Smid ◽  
John Dent ◽  
L. Ashley Blackshaw
Keyword(s):  
Gastroesophageal Reflux ◽  
Lower Esophageal Sphincter ◽  
Glucose Infusion ◽  
Gastric Distention ◽  
Low Level ◽  
Before And After ◽  
Esophageal Sphincter ◽  
Splanchnic Mechanoreceptors ◽  
High Level

Activation of gastric vagal mechanoreceptors by distention is thought to be the trigger for transient lower esophageal sphincter relaxations (TLESR), which lead to gastroesophageal reflux. The contribution of higher-threshold gastric splanchnic mechanoreceptors is uninvestigated. GABABreceptor agonists, including baclofen, potently reduce triggering of TLESR by low-level gastric distention. We aimed to determine first whether this effect of baclofen is maintained at high-level distention and second the role of splanchnic pathways in triggering TLESR. Micromanometric/pH studies in conscious ferrets showed that intragastric glucose infusion (25 ml) increased triggering of TLESR and reflux. Both were significantly reduced by baclofen (7 μmol/kg ip) ( P < 0.05). When 40 ml of air was added to the glucose infusion, more TLESR occurred than with glucose alone ( P < 0.01). These were also reduced by baclofen ( P < 0.001). TLESR after glucose/air infusion were assessed before and after splanchnectomy (2–4, 9–11, and 23–25 days), which revealed no change. Baclofen inhibits TLESR after both low- and high-level gastric distention. Splanchnic pathways do not contribute to increased triggering of TLESR by high-level gastric distention.

Getting the Spirit of Office Technologies! Does the Internal Organization Environment Support or Constrain?

2011 ◽  
pp. 194-210
Author(s):  
Huub J.M. Ruel
Keyword(s):  
Technology Implementation ◽  
Information Technologies ◽  
Organizational Environment ◽  
Adaptive Structuration Theory ◽  
Low Level ◽  
Adaptive Structuration ◽  
Work Autonomy ◽  
High Level ◽  
The Relationship

The relationship between Advanced Information Technologies (AIT) and organization is complex. Several theories and approaches try to get grip on this complex relationship. Adaptive Structuration Theory (AST) (DeSanctis and Poole, 1994) is one of them. It introduces the concept of spirit of AIT as an important determinant of AIT appropriation. AIT with a clear, coherent spirit will lead to a high level of AIT appropriation. But what about the role of the internal organizational environment? Does this constrain or support the role of the AIT’s spirit regarding AIT appropriation? This paper presents a study that aims to find an answer to this question. Three hypotheses were formulated and tested in four offices where employees used office technologies. Results confirm that a clear spirit is positively related to the level of appropriation as distinguished by DeSanctis and Poole (1994) and Poole and DeSanctis (1990). The results also make clear that this relationship is more positive among users who experienced a low level of change in the internal organizational environment along with the office technology implementation than among users who experienced a high level of change. Furthermore, the relationship is more positive among users with a low level of work autonomy than among users with a high level of work autonomy. This is not fully in line with our expectations. However, we think an explanation is available. We suppose that the answer lies in the office technology development process. All office technologies in this study’s offices were probably developed without anticipating the changes that office technology implementations might bring about in the internal organizational environment and with the aim to build systems that “reconfirm” the current “restrictive” work procedures. This study’s results once again indicate that office technology and other organizational components are interrelated.

scholarly journals Feature-Specific Neural Reactivation during Episodic Memory

2019 ◽  
Author(s):  
Michael B. Bone ◽  
Fahad Ahmad ◽  
Bradley R. Buchsbaum
Keyword(s):  
Frontal Cortex ◽  
Visual Features ◽  
Semantic Features ◽  
Low Level ◽  
Visual Hierarchy ◽  
Strict Interpretation ◽  
Novel Approach ◽  
High Level ◽  
Hierarchical Representations

AbstractWhen recalling an experience of the past, many of the component features of the original episode may be, to a greater or lesser extent, reconstructed in the mind’s eye. There is strong evidence that the pattern of neural activity that occurred during an initial perceptual experience is recreated during episodic recall (neural reactivation), and that the degree of reactivation is correlated with the subjective vividness of the memory. However, while we know that reactivation occurs during episodic recall, we have lacked a way of precisely characterizing the contents—in terms of its featural constituents—of a reactivated memory. Here we present a novel approach, feature-specific informational connectivity (FSIC), that leverages hierarchical representations of image stimuli derived from a deep convolutional neural network to decode neural reactivation in fMRI data collected while participants performed an episodic recall task. We show that neural reactivation associated with low-level visual features (e.g. edges), high-level visual features (e.g. facial features), and semantic features (e.g. “terrier”) occur throughout the dorsal and ventral visual streams and extend into the frontal cortex. Moreover, we show that reactivation of both low- and high-level visual features correlate with the vividness of the memory, whereas only reactivation of low-level features correlates with recognition accuracy when the lure and target images are semantically similar. In addition to demonstrating the utility of FSIC for mapping feature-specific reactivation, these findings resolve the relative contributions of low- and high-level features to the vividness of visual memories, clarify the role of the frontal cortex during episodic recall, and challenge a strict interpretation the posterior-to-anterior visual hierarchy.

scholarly journals Change Detection Based on Low-Level to High-Level Features Integration With Limited Samples

2020 ◽  
Vol 13 ◽  
pp. 6260-6276
Author(s):  
Xin Wang ◽  
Peijun Du ◽  
Dongmei Chen ◽  
Sicong Liu ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Change Detection ◽  
Low Level ◽  
High Level

scholarly journals Developing a Theory of Surprise from Travelers’ Extraordinary Food Experiences

2017 ◽  
Vol 57 (2) ◽  
pp. 218-231 ◽  
Author(s):  
Sandhiya Goolaup ◽  
Cecilia Solér ◽  
Robin Nunkoo
Keyword(s):  
Social Context ◽  
Cultural Capital ◽  
Theoretical Contribution ◽  
Low Level ◽  
Extraordinary Experiences ◽  
High Level

The purpose of this research is to explore the extraordinary experiences of food tourists and to develop a theory of surprise in relation to a typology of food cultural capital. We draw on phenomenological interviews with 16 food tourists. We found that food tourists experienced surprise in different ways, depending on their food cultural capital. Food tourists who possessed a high level of cultural capital were surprised by the simplicity or complexity of the experience while those possessing a low level of cultural capital were surprised by the genuinity of the experience. Thus, we make an important theoretical contribution here as we learn that the resources food tourists possessed in the form of cultural capital conditioned the ways in which they conceived an extraordinary experience. More so, using the cultural capital perspective, we have also demonstrated the role of social context in contributing to creating an extraordinary experience.

Effects of Controversy and Defensiveness on Cognitive Perspective-Taking

1980 ◽  
Vol 47 (3_suppl) ◽  
pp. 1043-1053 ◽  
Author(s):  
Dean Tjosvold ◽  
David W. Johnson ◽  
Lawrence J. Fabrey
Keyword(s):  
Cognitive Development ◽  
Perspective Taking ◽  
Moral Issue ◽  
Cognitive Perspective ◽  
Personal Competence ◽  
Low Level ◽  
Epistemic Curiosity ◽  
High Level

45 undergraduates discussed a moral issue with a confederate who had the same opinion (no controversy) or opposite opinion (controversy). Subjects in the conditions with controversy were induced to have a high level of defensiveness by a disconfirmation of personal competence or a low level of defensiveness by a confirmation. Subjects in no controversy experienced confirmation. Subjects in the condition of confirm controversy indicated mote conceptual conflict (uncertainty) and were more accurate in taking the cognitive perspective of the confederate than were subjects in the condition of confirm no controversy. These results support Piaget's and Kohlberg's views of the role of controversy in perspective-taking and cognitive development and Berlyne's theory of conceptual conflict and epistemic curiosity. Subjects in the condition of disconfirm controversy experienced more uncertainty and were more accurate in cognitive perspective-taking than were subjects in the condition of confirm controversy. Subjects in the condition of disconfirm controversy also experienced more internal distress, derogated the confederate and the confederate's position and arguments to a greater extent, and indicated greater closed-mindedness in responding to the confederate and the confederate's arguments than did subjects in the condition of confirm controversy.

scholarly journals A Transport Code for Radiocolloid Migration: With an Assessment of an Actual Low-Level Waste Site

1984 ◽  
Vol 44 ◽  
Author(s):  
Bryan J. Travis ◽  
H. E. Nuttall
Keyword(s):  
High Level Waste ◽  
Waste Site ◽  
Low Level ◽  
Transport Code ◽  
Experimental Laboratory ◽  
Rapid Transport ◽  
High Level ◽  
Waste Repositories ◽  
Low Level Radioactive Waste

AbstractRecently, there is increased concern that radiocolloids may act as a rapid transport mechanism for the release of radionuclides from high-level waste repositories. The role of colloids is, however, controversial because the necessary data and assessment methodology have been limited. To quantitatively assess the role of colloids, the TRACR3D transport code has been enhanced by the addition of the population balance equations. The code was tested against the experimental laboratory column data of Avogadro et al. Next a low-level radioactive waste site was investigated to explore whether colloid migration could account for the unusually rapid transport of plutonium and americium observed. The nature and modeling of radiocolloids are discussed along with site simulation results from the TRACR3D code.

Situated Image Understanding in a Multiagent Framework

1998 ◽  
Vol 12 (05) ◽  
pp. 595-624 ◽  
Author(s):  
N. Bianchi ◽  
P. Bottoni ◽  
P. Mussio ◽  
C. Spinu ◽  
C. Garbay
Keyword(s):  
Liver Biopsy ◽  
Image Understanding ◽  
The State ◽  
Reactive Control ◽  
Preliminary Results ◽  
Low Level ◽  
Local Properties ◽  
High Level ◽  
Biopsy Image

The paper addresses the problem of controlling situated image understanding processes. Two complementary control styles are considered and applied cooperatively, a deliberative one and a reactive one. The role of deliberative control is to account for the unpredictability of situations, by dynamically determining which strategies to pursue, based on the results obtained so far and more generally on the state of the understanding process. The role of reactive control is to account for the variability of local properties of the image by tuning operations to subimages, each one being homogeneous with respect to a given operation. A variable organization of agents is studied to face this variability. The two control modes are integrated into a unified formalism describing segmentation and interpretation activities. A feedback from high level interpretation tasks to low level segmentation tasks thus becomes possible and is exploited to recover wrong segmentations. Preliminary results in the field of liver biopsy image understanding are shown to demonstrate the potential of the approach.

scholarly journals The role of high-level and low-level features in style-based retrieval and generation of multimedia presentations

2001 ◽  
Vol 7 (1) ◽  
pp. 39-65 ◽  
Author(s):  
Frank Nack ◽  
Menzo Windhouwer ◽  
Lynda Hardman ◽  
Eric Pauwels ◽  
Michele Huijberts
Keyword(s):  
Multimedia Presentations ◽  
Low Level ◽  
High Level
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