scholarly journals Dynamics of top-down factors with relation to ecological attributes of an endangered species Commiphora wightii

2016 ◽  
Vol 8 (3) ◽  
pp. 1556-1564 ◽  
Author(s):  
R. N. Kulloli ◽  
Manish Mathur ◽  
Suresh Kumar
Keyword(s):  
Soil Samples ◽  
Available Phosphorus ◽  
Top Down ◽  
Commiphora Wightii ◽  
Ecological Attributes ◽  
Soil Variables ◽  
Explanatory Factors ◽  
Ecological Variables ◽  
Total Soil Nitrogen

Present study was aimed to explore the influence of top down factors on ecological attributes of Commiphora wightii collected from seven districts of arid and semi arid parts of the Rajasthan. Ecological variables in respect of 46 accessions of this species were quantified. To assess the explanatory factors governing quantified ecological variables, soil samples were collected to analyze soil texture, soil EC, pH, available potassium, available phosphorus and total soil nitrogen. Results showed that there was a specific relationship between soil variables and occurence of C. wightii. The mid ranges of potassium (200-300 kg/ha) emerged as favourable to have better density and health of C. wightii: This is the first report on regulatory role of potassium on distribution and occurrence of C. wightii.

scholarly journals Effect of seasonal variation on soil enzymes activity and fertility of soil in paddy fields of North Vanlaiphai, Mizoram, India

2018 ◽  
Vol 18 (2) ◽  
pp. 70-73
Author(s):  
C. Vanlalveni ◽  
R. Lalfakzuala
Keyword(s):  
Soil Nitrogen ◽  
Paddy Field ◽  
Soil Enzymes ◽  
Soil Samples ◽  
Available Phosphorus ◽  
Exchangeable Potassium ◽  
Growing Environment ◽  
Total Soil Nitrogen ◽  
Soil Enzymes Activity

For sustainability in agricultural productions, familiarity of soil quality and manual improvement to create the best possible growing environment for plants are extremely important. In this study the quality of soil of a paddy field in North Vanlaiphai was investigated with respect to the change in seasons throughout the year. A total of five (5) soil samples were selected from various places of the paddy field, and soil fertility indicators such as pH, total soil nitrogen (N), available phosphorus (Pav), exchangeable potassium (Kex), soil organic carbon (SOC), soil organic matter (SOM) and soil enzymes viz. dehydrogenase, phosphatase and urease were analyzed using standard protocols. All the parameters except available phosphorus and exchangeable potassium were found to be highest during rainy season whereas lowest in summer.

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.

TESTING GOAL-DRIVEN CAPTURE BY THREAT

2019 ◽  
Author(s):  
Chris Robert Harrison Brown
Keyword(s):  
Experimental Evidence ◽  
Attentional Capture ◽  
Critical Role ◽  
Experimental Manipulation ◽  
Contingent Capture ◽  
Top Down ◽  
Affective Stimuli ◽  
Clinical Disorders ◽  
Positive Stimuli

Attention has long been characterised within prominent models as reflecting a competition between goal-driven and stimulus-driven processes. It remains unclear, however, how involuntary attentional capture by affective stimuli, such as threat-laden content, fits into such models. While such effects were traditionally held to reflect stimulus-driven processes, recent research has increasingly implicated a critical role of goal-driven processes. Here we test an alternative goal-driven account of involuntary attentional capture by threat, using an experimental manipulation of goal-driven attention. To this end we combined the classic ‘contingent capture’ and ‘emotion-induced blink’ (EIB) paradigms in an RSVP task with both positive or threatening target search goals. Across six experiments, positive and threat distractors were presented in peripheral, parafoveal, and central locations. Across all distractor locations, we found that involuntary attentional capture by irrelevant threatening distractors could be induced via the adoption of a search goal for a threatening category; adopting a goal for a positive category conversely led to capture only by positive stimuli. Our findings provide direct experimental evidence for a causal role of voluntary goals in involuntary capture by irrelevant threat stimuli, and hence demonstrate the plausibility of a top-down account of this phenomenon. We discuss the implications of these findings in relation to current cognitive models of attention and clinical disorders.

scholarly journals The future of SIMS: Who embodies which smile and when?

2010 ◽  
Vol 33 (6) ◽  
pp. 464-480 ◽  
Author(s):  
Paula M. Niedenthal ◽  
Martial Mermillod ◽  
Marcus Maringer ◽  
Ursula Hess
Keyword(s):  
Facial Expression ◽  
Eye Contact ◽  
Initial Position ◽  
Top Down ◽  
The Core ◽  
Facial Expression Of Emotion ◽  
Expression Of Emotion ◽  
Target Article ◽  
The Future

AbstractThe set of 30 stimulating commentaries on our target article helps to define the areas of our initial position that should be reiterated or else made clearer and, more importantly, the ways in which moderators of and extensions to the SIMS can be imagined. In our response, we divide the areas of discussion into (1) a clarification of our meaning of “functional,” (2) a consideration of our proposed categories of smiles, (3) a reminder about the role of top-down processes in the interpretation of smile meaning in SIMS, (4) an evaluation of the role of eye contact in the interpretation of facial expression of emotion, and (5) an assessment of the possible moderators of the core SIMS model. We end with an appreciation of the proposed extensions to the model, and note that the future of research on the problem of the smile appears to us to be assured.

Sensory regulation of quadrupedal locomotion: a top-down or bottom-up control system?

2012 ◽  
Vol 108 (3) ◽  
pp. 709-711 ◽  
Author(s):  
Yann Thibaudier ◽  
Marie-France Hurteau
Keyword(s):  
Control System ◽  
Central Pattern Generators ◽  
Top Down ◽  
Bottom Up ◽  
Sensory Inputs ◽  
Sensory Regulation ◽  
Before And After ◽  
Pattern Generators

Propriospinal pathways are thought to be critical for quadrupedal coordination by coupling cervical and lumbar central pattern generators (CPGs). However, the mechanisms involved in relaying information between girdles remain largely unexplored. Using an in vitro spinal cord preparation in neonatal rats, Juvin and colleagues ( Juvin et al. 2012 ) have recently shown sensory inputs from the hindlimbs have greater influence on forelimb CPGs than forelimb sensory inputs on hindlimb CPGs, in other words, a bottom-up control system. However, results from decerebrate cats suggest a top-down control system. It may be that both bottom-up and top-down control systems exist and that the dominance of one over the other is task or context dependent. As such, the role of sensory inputs in controlling quadrupedal coordination before and after injury requires further investigation.

Regulating the regulators: the rise of the United Kingdom Professional Standards Authority

2018 ◽  
pp. 93-116
Author(s):  
Judith Allsop ◽  
Kathryn Jones
Keyword(s):  
United Kingdom ◽  
Self Regulation ◽  
Professional Standards ◽  
Corporate Management ◽  
Top Down ◽  
Professional Regulation ◽  
The United Kingdom ◽  
Management Techniques

In the United Kingdom reforms to professional regulation have been introduced to enhance public protection. This chapter accounts for changes from 2002 to 2016 with the introduction of a meta-regulator to oversee nine statutory professional Councils. It examines the expansion of the role of the meta-regulator and reforms within the professional councils themselves. It draws on data collected to show increases in costs and activity and explains the shift from self-regulation to top-down governance using corporate management techniques of audit and review. It demonstrates that the reforms have been evolutionary and that further reform is ongoing.

Conclusion: lessons learned and tensions exposed

2017 ◽  
Author(s):  
Peter North ◽  
Molly Scott Cato
Keyword(s):  
Latin America ◽  
Universal Access ◽  
Social Economy ◽  
Lessons Learned ◽  
Top Down ◽  
Lost Decade ◽  
Global North ◽  
Social Economies ◽  
North And South

This concluding chapter draws together lessons learned from the encounters between social economy activists and academics from Latin America and Europe which were brought together in this collection. It discusses the role of antagonism in social economies, especially in the light of austerity in Europe – and Latin America’s experiences of a lost decade. It discusses tensions between the benefits of top down, centralised, state delivered welfare, and grassroots creativity, arguing for the development of 45 degree politics that maintains the best of both conceptions, with the state maintaining universal access and sufficient resources, while grassroots actors ensure that initiatives are tailored to local needs. Finally it brings together arguments for the need for the SSE sector to develop conceptions of prosperous livelihoods providing dignity and inclusion for those currently denied a livelihood with dignity in the concept of the Anthropocene. It concludes by arguing that these conceptions can best be developed though continued dialogue between actors in the global North and South.

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