scholarly journals Probabilities of perceptual depth ordering in transparent motion and the relative effect of different depth cues

2010 ◽  
Vol 7 (9) ◽  
pp. 744-744
Author(s):  
R. Moreno-Bote ◽  
A. Shipiro ◽  
J. Rinzel ◽  
N. Rubin
Keyword(s):  
Relative Effect ◽  
Depth Cues ◽  
Transparent Motion ◽  
Depth Ordering

Nonsymbolic-Magnitude Deficit in Adults With Developmental Dyscalculia: Evidence of Impaired Size Discrimination but Intact Size Constancy

2021 ◽  
pp. 095679762199520
Author(s):  
Nirit Fooks ◽  
Bat-Sheva Hadad ◽  
Orly Rubinsten
Keyword(s):  
Size Constancy ◽  
Size Discrimination ◽  
Depth Cues ◽  
Developmental Dyscalculia ◽  
Core Deficit ◽  
Depth Ordering

Although researchers have debated whether a core deficit of nonsymbolic representation of magnitude underlies developmental dyscalculia (DD), research has mostly focused on numerosity processing. We probed the possibility of a general magnitude deficit in individuals with DD and asked whether sensitivity to size varied in contexts of depth ordering and size constancy. We measured full psychometric functions in size-discrimination tasks in 12 participants with DD and 13 control participants. Results showed that although people with DD exhibited veridical perceived magnitude, their sensitivity to size was clearly impaired. In contrast, when objects were embedded in depth cues allowing size-constancy computations, participants with DD demonstrated typical sensitivity to size. These results demonstrate a deficit in the perceptual resolutions of magnitude in DD. At the same time, the finding of an intact size constancy suggests that when magnitude perception is facilitated by implicit mandatory computations of size constancy, this deficit is no longer evident.

scholarly journals Combining depth cues: effects upon accuracy and speed of performance in a depth-ordering task

2004 ◽  
Vol 44 (6) ◽  
pp. 557-562 ◽  
Author(s):  
George Mather ◽  
David R.R Smith
Keyword(s):  
Depth Cues ◽  
Depth Ordering

Relative Effect of Organizational Practices for Reducing Racial and Ethnic Harassment and Discrimination

2007 ◽  
Author(s):  
Alayne J. Ormerod ◽  
Christopher D. Nye ◽  
Sadie E. Larsen ◽  
Julia E. Siebert
Keyword(s):  
Relative Effect ◽  
Organizational Practices ◽  
Ethnic Harassment

An Accelerated Cue Combination Principle Accounts for Multi-cue Depth Perception

2020 ◽  
Vol 3 (1) ◽  
pp. 10501-1-10501-9
Author(s):  
Christopher W. Tyler
Keyword(s):  
Belief Propagation ◽  
Probability Distributions ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Fusion Model ◽  
Cue Combination ◽  
Depth Estimate ◽  
Appropriate Behavior ◽  
Depth Cues ◽  
Bayesian Averaging

Abstract For the visual world in which we operate, the core issue is to conceptualize how its three-dimensional structure is encoded through the neural computation of multiple depth cues and their integration to a unitary depth structure. One approach to this issue is the full Bayesian model of scene understanding, but this is shown to require selection from the implausibly large number of possible scenes. An alternative approach is to propagate the implied depth structure solution for the scene through the “belief propagation” algorithm on general probability distributions. However, a more efficient model of local slant propagation is developed as an alternative.The overall depth percept must be derived from the combination of all available depth cues, but a simple linear summation rule across, say, a dozen different depth cues, would massively overestimate the perceived depth in the scene in cases where each cue alone provides a close-to-veridical depth estimate. On the other hand, a Bayesian averaging or “modified weak fusion” model for depth cue combination does not provide for the observed enhancement of perceived depth from weak depth cues. Thus, the current models do not account for the empirical properties of perceived depth from multiple depth cues.The present analysis shows that these problems can be addressed by an asymptotic, or hyperbolic Minkowski, approach to cue combination. With appropriate parameters, this first-order rule gives strong summation for a few depth cues, but the effect of an increasing number of cues beyond that remains too weak to account for the available degree of perceived depth magnitude. Finally, an accelerated asymptotic rule is proposed to match the empirical strength of perceived depth as measured, with appropriate behavior for any number of depth cues.

Access to and Use of Information and Communication Technology and Task Performance

Mousaion ◽  
2018 ◽  
Vol 35 (4) ◽  
Author(s):  
Wuraola J. Oyedipe ◽  
Sunday O. Popoola
Keyword(s):  
Information And Communication Technology ◽  
Communication Technology ◽  
Joint Effect ◽  
Public University ◽  
Relative Effect ◽  
University Libraries ◽  
Job Knowledge ◽  
Ict Use ◽  
Information And Communication ◽  
And Task

The study investigated the relationship between access to and use of information and communication technology and task performances of library personnel in public university libraries in South West Nigeria. The total enumeration technique was used to cover 330 library professionals working in public university libraries in the zone. A self-developed questionnaire was used to obtain data. Out of the 330 copies of questionnaire administered 248 (76.6%) copies were found useable. The findings revealed that the level of task performances of the respondents was high, and the level of access to ICT was high, while the frequency of ICT use was moderate. The results indicated that there was a positive relative effect of ICT access and use on task performances. The study also found a significant relationship between the access to ICT, ICT use and task performances of respondents, while there was a significant joint effect of access to ICT and ICT use on the task performances of library personnel. The study recommended the constant development of personnel regarding job knowledge and skills, the promotion of creativity and adaptability skills to enhance personnel task performances, while library managers should continue to make ICT tools accessible for library personnel to allow their use in improving the workflow in the library.

Formulation of Oral Mucoadhesive Tablets using Mucilage Isolated from Buchanania lanzan spreng Seeds

2014 ◽  
Vol 7 (2) ◽  
pp. 2494-2503
Author(s):  
Sudarshan Singh ◽  
Ayaz Ahmad ◽  
Sunil Bothara B
Keyword(s):  
Drug Delivery ◽  
Guar Gum ◽  
Physical Property ◽  
Flow Property ◽  
Relative Effect ◽  
Losartan Potassium ◽  
In Vitro Dissolution ◽  
Wet Granulation ◽  
Microbial Count

The present study was taken to formulate and evaluate mucilage obtained from Buchanania lanzan spreng seeds (BL) belonging to family anacardiacea for oral mucoadhesive drug delivery system containing losartan potassium. Physiochemical characteristics of mucilage, such as swelling index, microbial count, viscosity, hydration capacity, flow property, and pH were studied. The mucilage was evaluated for its mucoadhesive properties in compressed tablet, containing losartan potassium. Granules were prepared by wet granulation process using polyvinylpyrrolidone as binding agent. Mucilage was used in four different concentrations i.e., 21, 42 and 55% w/w. The tablet were prepared and evaluated for its physical property. Further, in vitro dissolution and swelling index was determined. The property of bioadhesive strength of isolated mucilage was compared with Guar gum and HPMC E5LV, which was used as standard mucoadhesive agent concentration. Bioadhesive strength of the tablet was measured on the modified physical balance. Result revealed that tablets had good physiochemical properties, and drug release was retarded as concentration of mucilage was increased. The force of adhesion was obtained 0.1238N, 0.2822N, 0.5175N, 0.8679N and 0.3983N respectively for F1, F2, F3, F4 and F5. Formulations were subjected for study the effect of agitation at different rpm. Formulation showed relative effect on release of drug from formulation. All the formulations were subjected to stability studies for three months, all formulations showed stability with respect to release pattern. In conclusions, these results indicate that the seed mucilage of BL can be a suitable excipient for oral mucoadhesive drug delivery systems.  

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