Perception of Accelerating Self-Motion: Global Optical Flow Rate Dominates Discontinuity Rate

1997 ◽  
Vol 41 (2) ◽  
pp. 1333-1337 ◽  
Author(s):  
Brian P. Dyre
Keyword(s):  
Optical Flow ◽  
Flow Rate ◽  
Visual Stimuli ◽  
Sources Of Information ◽  
Minor Influence ◽  
Primary Basis ◽  
A Minor ◽  
And Control ◽  
Self Motion

Owen, Wolpert, and Warren (1984) proposed that egospeed may be perceived from global optical flow rate, discontinuity rate, or both. Previous psychophysical research found that both sources of information influence judgments of acceleration and control of egospeed, but that discontinuity rate dominated. However, the validity of these results is questionable due to problems with the visual stimuli used, such as confounding of discontinuity rate with proximal flow rate and low frame rates. The current study examined the relative contributions of global optical flow rate and discontinuity rate to perception of accelerating self-motion with stimuli that lacked these problems. I found that global optical flow rate accounted for 60% of the variability in acceleration judgments, compared with 0.86% for discontinuity rate. This result indicates that discontinuity rate exerts only a minor influence, and global optical flow rate is the primary basis for perception of accelerating self-motion, and hence, egospeed.

Use of Global Optical Flow Rate and Discontinuity Rate Depends on Their Validity as Determinants of Egospeed

1998 ◽  
Vol 42 (22) ◽  
pp. 1540-1544 ◽  
Author(s):  
Terry G. Ballard ◽  
Tony Roach ◽  
Brian P. Dyre
Keyword(s):  
Visual System ◽  
Optical Flow ◽  
Flow Rate ◽  
Frame Rate ◽  
Sources Of Information ◽  
Multiple Sources ◽  
Relative Validity ◽  
Self Motion ◽  
Source Of Information ◽  
Information Frame

Previous research found both discontinuity rate and global optical flow rate contribute to the perception of egospeed but differed in estimates of which source of information dominated. This research examined two methodological differences that may explain the conflicting results: frame rate, and the relative validity of discontinuity rate and flow rate as determinants of egospeed. Observers estimated egospeed perceived during simulations of self-motion. Discontinuity rate and flow rate were manipulated independently by varying velocity and altitude. Frame rates were consistent with Dyre (1997) and the validity of discontinuity rate and flow rate as determinants of egospeed was varied. We found the relative use of discontinuity rate and flow rate was related to the validity of these sources of information. Frame rate was not an important factor. These results suggest the visual system is sensitive to multiple sources of information for perceiving egospeed and adapts to the most optimal source.

scholarly journals Postural sway in the moving room scenario: New evidence for functional dissociation between self-motion perception and postural control

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0257212
Author(s):  
Kentaro Horiuchi ◽  
Kuniyasu Imanaka ◽  
Masami Ishihara
Keyword(s):  
Visual Field ◽  
Postural Control ◽  
Optical Flow ◽  
Repeated Measures ◽  
Center Of Pressure ◽  
Visual Stimuli ◽  
Quiet Standing ◽  
Body Sway ◽  
Pendular Movement ◽  
Self Motion

Postural control in quiet standing is often explained by a reflexive response to optical flow, the apparent motion of environmental objects in a visual scene. However, moving room experiments show that even small-amplitude body sway can evoke odd sensations or motion sickness, indicating that a consciousness factor may also be involved. Studies targeting perception of self-motion, vection, typically use rapid visual stimuli moving in a single direction to maintain a constant feeling of vection, and there are few studies of vection using low-speed sinusoidal visual stimuli similar to human pendular movement. In the present study we searched for changes in postural control during periods of vection during quiet standing. Participants (N = 19, age = 20.4 ±1.1 years) were shown dynamic visual stimuli in the form of sinusoidally expanding and contracting random dots, and the stimuli speed and visual field were manipulated. Posture was continually evaluated using Center of Pressure (CoP) measurements. Participants were also asked to report feelings of vection, both by pressing a button during the trial and through an overall rating at the end of each trial. Using repeated-measures ANOVA, we assessed changes in the CoP and vection variables between experimental conditions, as well as possible interactions between the variables. The results show that postural reaction and vection were both affected by the visual stimuli and varied with speed. The peripheral visual field was found to couple to stronger feeling of vection and better quality of postural control. However, no significant relationship between postural control and vection, nor evidence of vection interaction to the relationship between optical flow and postural control, was found. Based on our results we conclude that for postural stability during quiet standing, visual cues dominate over any potential consciousness factor arising due to vection.

scholarly journals Visual comparison of two data sets: Do people use the means and the variability?

2017 ◽  
Vol 3 (1) ◽  
pp. 97-111
Author(s):  
Robin S. S. Kramer ◽  
Caitlin G. R. Telfer ◽  
Alice Towler
Keyword(s):  
Standard Deviation ◽  
Best Practices ◽  
Multiple Comparisons ◽  
Mean Difference ◽  
Data Sets ◽  
Sources Of Information ◽  
Minor Influence ◽  
The Mean ◽  
Sampling Variation ◽  
A Minor

In our everyday lives, we are required to make decisions based upon our statistical intuitions. Often, these involve the comparison of two groups, such as luxury versus family cars and their suitability. Research has shown that the mean difference affects judgements where two sets of data are compared, but the variability of the data has only a minor influence, if any at all. However, prior research has tended to present raw data as simple lists of values. Here, we investigated whether displaying data visually, in the form of parallel dot plots, would lead viewers to incorporate variability information. In Experiment 1, we asked a large sample of people to compare two fictional groups (children who drank ‘Brain Juice’ versus water) in a one-shot design, where only a single comparison was made. Our results confirmed that only the mean difference between the groups predicted subsequent judgements of how much they differed, in line with previous work using lists of numbers. In Experiment 2, we asked each participant to make multiple comparisons, with both the mean difference and the pooled standard deviation varying across data sets they were shown. Here, we found that both sources of information were correctly incorporated when making responses. Taken together, we suggest that increasing the salience of variability information, through manipulating this factor across items seen, encourages viewers to consider this in their judgements. Such findings may have useful applications for best practices when teaching difficult concepts like sampling variation.

Interference mitigation in point to point wireless sensor networks using LSP protocol and time division multiplexing approach

2020 ◽  
Vol 39 (4) ◽  
pp. 5449-5458
Author(s):  
A. Arokiaraj Jovith ◽  
S.V. Kasmir Raja ◽  
A. Razia Sulthana
Keyword(s):  
Energy Consumption ◽  
Large Scale ◽  
Control Parameter ◽  
Interference Mitigation ◽  
Wireless Sensor ◽  
Point To Point ◽  
A Minor ◽  
Two Stages ◽  
Time Division ◽  
And Control

Interference in Wireless Sensor Network (WSN) predominantly affects the performance of the WSN. Energy consumption in WSN is one of the greatest concerns in the current generation. This work presents an approach for interference measurement and interference mitigation in point to point network. The nodes are distributed in the network and interference is measured by grouping the nodes in the region of a specific diameter. Hence this approach is scalable and isextended to large scale WSN. Interference is measured in two stages. In the first stage, interference is overcome by allocating time slots to the node stations in Time Division Multiple Access (TDMA) fashion. The node area is split into larger regions and smaller regions. The time slots are allocated to smaller regions in TDMA fashion. A TDMA based time slot allocation algorithm is proposed in this paper to enable reuse of timeslots with minimal interference between smaller regions. In the second stage, the network density and control parameter is introduced to reduce interference in a minor level within smaller node regions. The algorithm issimulated and the system is tested with varying control parameter. The node-level interference and the energy dissipation at nodes are captured by varying the node density of the network. The results indicate that the proposed approach measures the interference and mitigates with minimal energy consumption at nodes and with less overhead transmission.

Right to Parental Care

2017 ◽  
Author(s):  
Asha Bajpai
Keyword(s):  
Law Reform ◽  
Best Interest ◽  
Family Courts ◽  
Custody Of Children ◽  
The Family ◽  
Shared Parenting ◽  
The Right ◽  
A Minor ◽  
And Control ◽  
Physical Care

Custody refers to the physical care and control of a minor whereas guardianship is a wider term and includes rights and duties with respect to the care and control of minor’s person and property, and includes the right to make decisions relating to the minor. The present legal regime relating to guardianship and custody of children is discussed, including the Guardians and Wards Act, 1890, the Hindu Minority and Guardianship Act, 1956, the personal and matrimonial laws, and relevant provisions in the Family Courts Act and Protection of Women against Domestic Violence Act, 2005. The emerging concepts of shared parenting, joint custody, and the interparental child removal or abduction of child is included. There is review and analysis of some major reported judicial decisions. A comparative survey of international laws and trends has been done. Suggestions for law reform in the best interest of the child have been given.

scholarly journals 40S ribosome profiling reveals distinct roles for Tma20/Tma22 (MCT-1/DENR) and Tma64 (eIF2D) in 40S subunit recycling

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
David J. Young ◽  
Sezen Meydan ◽  
Nicholas R. Guydosh
Keyword(s):  
Protein Synthesis ◽  
Neurological Disease ◽  
Ribosome Profiling ◽  
Minor Role ◽  
Stop Codons ◽  
Genes Encoding ◽  
Ribosome Footprinting ◽  
A Minor ◽  
And Control ◽  
In Cells

AbstractThe recycling of ribosomes at stop codons for use in further rounds of translation is critical for efficient protein synthesis. Removal of the 60S subunit is catalyzed by the ATPase Rli1 (ABCE1) while removal of the 40S is thought to require Tma64 (eIF2D), Tma20 (MCT-1), and Tma22 (DENR). However, it remains unclear how these Tma proteins cause 40S removal and control reinitiation of downstream translation. Here we used a 40S ribosome footprinting strategy to directly observe intermediate steps of ribosome recycling in cells. Deletion of the genes encoding these Tma proteins resulted in broad accumulation of unrecycled 40S subunits at stop codons, directly establishing their role in 40S recycling. Furthermore, the Tma20/Tma22 heterodimer was responsible for a majority of 40S recycling events while Tma64 played a minor role. Introduction of an autism-associated mutation into TMA22 resulted in a loss of 40S recycling activity, linking ribosome recycling and neurological disease.

Regulating Religious Broadcasting

1992 ◽  
Vol 2 (10) ◽  
pp. 287-304
Author(s):  
Ian Leigh
Keyword(s):  
New Technologies ◽  
Technological Advance ◽  
Regulatory Framework ◽  
Religious Expression ◽  
Satellite Broadcasting ◽  
Religious Broadcasting ◽  
The Creation ◽  
The Uk ◽  
A Minor ◽  
And Control

The broadcasting world is currently undergoing a revolution. The new technologies of cable and, more importantly, satellite broadcasting have brought within reach an enormous potential expansion and diversity in broadcasting. The Broadcasting Act 1990 is the government's response to the challenge, creating a mostly new regulatory framework. Alongside technological advance there has been a growing concern with regulating programme quality, as the creation of the Broadcasting Standards Commission (placed by Pt. V of the Act on a statutory footing) bears witness. A minor, but not insignificant, place in these cross-currents of ferment is occupied by religious broadcasting. This article seeks to place the controls and duties relating to religious broadcasting under the new regime within the context of its history in the UK and to consider the extent to which the new legal and administrative controls achieve an acceptable balance between religious expression and control of standards.

Structure-activity relations and β-lactamase resistance

1980 ◽  
Vol 289 (1036) ◽  
pp. 197-205 ◽  
Keyword(s):  
Broad Spectrum ◽  
Product Inhibition ◽  
Sulphur Atom ◽  
Chemical Modifications ◽  
Gram Negative ◽  
Structure Activity ◽  
Broad Spectrum Resistance ◽  
Structure Activity Relations ◽  
Minor Influence ◽  
A Minor

β-Lactam antibiotics resistant to β-lactamase degradation can be produced by many chemical modifications, but often at the expense of antibacterial activity. Substitution onto several positions in the molecule produces different and often selective resistance; for instance, heavily sterically hindered acyl groups give staphylococcal P-lactamase resistance to penicillins, and resistance to some enzymes from Gram-negative pathogens to both penicillins and cephalosporins. 6-α- or 7-α-substituents respectively confer a broad spectrum of resistance (e.g. cefoxitin), but changes at positions 2 or 3 have only a minor influence on enzyme susceptibility. Changes in the ring condensed with the β-lactam, such as changing ceph-3-em to ceph-2-em may greatly enhance stability. Small improvements can occur when the nuclear sulphur atom is oxidized, but a much better effect is obtained when it is replaced by another atom such as oxygen, as in clavulanic acid. This compound appears to have broad spectrum resistance which is actually due to susceptibility and subsequent product inhibition.

Lubrication Properties of Aqueous Solutions with Polyethoxylated Ether (PEOE) Added

2011 ◽  
Vol 239-242 ◽  
pp. 1359-1363
Author(s):  
Chao Hui Zhang ◽  
Si Si Liu ◽  
Yue Tao Sun ◽  
Jun Ming Liu
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Metal Working ◽  
Functional Additives ◽  
Film Forming ◽  
Minor Influence ◽  
Forming Characteristics ◽  
Aqueous Surfactants ◽  
A Minor ◽  
Lubrication Properties

Aqueous solutions have found broad usages as lubricants, in conjunction with other possible utilizations, such as in metal working and other industries. Due to the inferior lubricity, functional additives are needed to improve their tribological performances among which aqueous surfactants are exclusively included. The film forming property of aqueous solution with polyethoxylated ether added (PEOE) is measured, taking consideration of the influences of the temperature and the concentration. The addition of PEOEs into aqueous solutions will largely increase the film forming capacity. But the concentration has only a minor influence on the lubrication property of the aqueous solutions with PEOEs. The cloud point will strongly alter the film forming characteristics.

scholarly journals Influence of Different Commercial Yeasts on Volatile Fraction of Sparkling Wines

Foods ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 247
Author(s):  
Valeriu V. Cotea ◽  
Mihai Cristian Focea ◽  
Camelia Elena Luchian ◽  
Lucia Cintia Colibaba ◽  
Elena Cristina Scutarașu ◽  
...  
Keyword(s):  
International Organization ◽  
Volatile Fraction ◽  
Chemical Parameters ◽  
Physical Chemical ◽  
Organoleptic Characteristics ◽  
Mass Spectrometry Technique ◽  
Minor Influence ◽  
Spectrometry Technique ◽  
A Minor ◽  
Aging Stage

The occurrence of aroma constituents in sparkling wines, with direct impact on their organoleptic characteristics, is affected by several factors, for example the base-wine particularities, grapes cultivar conditions, inoculated yeasts, the aging stage, and wine-making practices. This study evaluated the influence of different four commercial yeasts (IOC FIZZ™, IOC DIVINE™, LEVULIA CRISTAL™, and IOC 18-2007™) on the volatile composition of experimental sparkling wines. For this, five sparkling wines variants from the Muscat Ottonel grape variety were obtained. The base-wine was obtained through reverse osmosis and had a predetermined alcoholic concentration (10.5% vol.). In order to fulfill the proposed purpose, the experimental sparkling wines were characterized by the physical–chemical parameters (according to International Organization of Vine and Wine methods of analysis), volatile fraction (using gas-chromatography coupled with mass spectrometry technique), and sensory descriptors. Data showed a key impact on the concentration of the volatile constituents (p < 0.05), depending on the type of inoculated yeast for the second fermentation. Regarding the sensory analysis, important differences can be observed due to the type of inoculated yeast. Only a minor influence on the physical–chemical parameters was registered.

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