Cueing Attention by Relative Motion in the Periphery of the Visual Field

Perception ◽  
10.1068/p5752 ◽  
2007 ◽  
Vol 36 (7) ◽  
pp. 955-970 ◽  
Author(s):  
Dorothe A Poggel ◽  
Hans Strasburger ◽  
Manfred MacKeben
Keyword(s):  
Visual Field ◽  
Flow Field ◽  
Relative Motion ◽  
Visual Stimulation ◽  
Discrimination Performance ◽  
Body Motion ◽  
Practical Relevance ◽  
Visual Objects ◽  
Field Patterns ◽  
Contrast Thresholds

Sudden changes of visual stimulation attract attention. The observer's body motion generates retinal-flow field patterns containing information about his/her own speed and trajectory and relative motion of other objects. We investigated the effectiveness of relative motion as an attentional cue and compared it with conventional cueing by appearance of a frame in the far periphery of the visual field. In a group of ten subjects, contrast thresholds for the perception of static Gabor grating orientation [four alternative non-forced-choice (4ANFC)] task were determined at 20°, 30°, 40°, and 60° eccentricity. Subsequently, near-threshold discrimination performance of Gabor pattern orientation without versus with a ring-shaped cue was measured at the same positions. The same Gabor patterns were then presented embedded in a random-dot flow field, and uncued discrimination performance was compared with performance after presentation of a relative-motion cue (RMC), ie a small random-dot field with motion in the opposite direction of the flow field. Both the conventional ring cue and the RMC induced significantly increased discrimination performance at all test locations. With the parameters chosen for this study, the RMC was slightly less effective than the conventional cue, but its effects were somewhat more pronounced in the far periphery of the visual field. Thus, relative motion is a powerful cue to attract attention to peripheral visual objects and improves performance as effectively as a conventional ring cue. The findings have practical relevance for everyday life, in particular for tasks like driving and navigation.

A High Invariance Motion Representation for Skeleton-Based Action Recognition

2016 ◽  
Vol 30 (08) ◽  
pp. 1650018 ◽  
Author(s):  
Songrui Guo ◽  
Huawei Pan ◽  
Guanghua Tan ◽  
Lin Chen ◽  
Chunming Gao
Keyword(s):  
Action Recognition ◽  
Relative Motion ◽  
Local Coordinate System ◽  
Research Work ◽  
Human Action Recognition ◽  
Human Action ◽  
Body Motion ◽  
Motion Representation ◽  
Representation Method ◽  
Relative Geometry

Human action recognition is very important and significant research work in numerous fields of science, for example, human–computer interaction, computer vision and crime analysis. In recent years, relative geometry features have been widely applied to the description of relative relation of body motion. It brings many benefits to action recognition such as clear description, abundant features etc. But the obvious disadvantage is that the extracted features severely rely on the local coordinate system. It is difficult to find a bijection between relative geometry and skeleton motion. To overcome this problem, many previous methods use relative rotation and translation between all skeleton pairs to increase robustness. In this paper we present a new motion representation method. It establishes a motion model based on the relative geometry with the aid of special orthogonal group SO(3). At the same time, we proved that this motion representation method can establish a bijection between relative geometry and motion of skeleton pairs. After the motion representation method in this paper is used, the computation cost of action recognition reduces from the two-way relative motion (motion from A to B and B to A) to one-way relative motion (motion from A to B or B to A) between any skeleton pair, namely, permutation problem [Formula: see text] is simplified into combinatorics problem [Formula: see text]. Finally, the experimental results of the three motion datasets are all superior to present skeleton-based action recognition methods.

Offloading Operability of Small Scale AG FLNG With Side-by-Side Moored Small Scale LNG Carrier in Offshore West Africa

2017 ◽  
Author(s):  
Mun-sung Kim ◽  
Eric Morilhat ◽  
X. C. Nguyen ◽  
Bo-hee Kim ◽  
Jung-moon Jang ◽  
...  
Keyword(s):  
West Africa ◽  
Relative Motion ◽  
Structural Integrity ◽  
Effective Means ◽  
Production Capacity ◽  
Cost Effective ◽  
Body Motion ◽  
Small Scale ◽  
Associated Gas ◽  
High Level

This study describes one of the technical solutions for Small Scale FLNG (SSFLNG)[1] development specifically designed to monetize Associated Gas (AG) of producing oil fields located within convenient distance of an existing LNG Plant or Port with LNG storage facility. Limited production capacity combined with short range small scale LNG carriers (SSLNGC), provide a cost effective means for LNG production. Ship to ship off-loading operation by loading arm has been considered in AG SSFLNG. Produced LNG is to be off-loaded from the SSFLNG to side-by-side moored SSLNGC. Relative motion and dynamic load acting on loading arm system in side-by-side mooring arrangement is one of key factors to estimate the offloading operability of the AG SSFLNG. In this paper, a numerical two-body motion analysis for the side-by-side moored SSFLNG in frequency- and time-domain is carried out. Also, the basic engineering work is carried out for the marine loading arms (MLA). Since the MLA reacts approximately as a linear system, it is calculated by a full spectral RAO analysis for each of the worst load cases issued from the spectral ranking. All loads and stresses inside the MLA are verified in accordance with EN1474-1[2] for the situations identified in the previous step. A high level fatigue analysis focused on the cryogenic swivel joints is carried out. Based on the numerical calculation for relative motion in side-by-side moored FLNG, we have been performed structural assessment for MLA in several environment conditions. The structural integrity of both MLA and the LNGC manifold are validated during offloading for Offshore West Africa.

scholarly journals Artificial Intelligence Classification of Central Visual Field Patterns in Glaucoma

Ophthalmology ◽  
2020 ◽  
Vol 127 (6) ◽  
pp. 731-738
Author(s):  
Mengyu Wang ◽  
Lucy Q. Shen ◽  
Louis R. Pasquale ◽  
Michael V. Boland ◽  
Sarah R. Wellik ◽  
...  
Keyword(s):  
Artificial Intelligence ◽  
Visual Field ◽  
Central Visual Field ◽  
Field Patterns

Current density and polarization curves for radial flow field patterns applied to PEMFCs (Proton Exchange Membrane Fuel Cells)

Energy ◽  
2010 ◽  
Vol 35 (2) ◽  
pp. 920-927 ◽  
Author(s):  
S. Cano-Andrade ◽  
A. Hernandez-Guerrero ◽  
M.R. von Spakovsky ◽  
C.E. Damian-Ascencio ◽  
J.C. Rubio-Arana
Keyword(s):  
Fuel Cells ◽  
Flow Field ◽  
Current Density ◽  
Proton Exchange Membrane ◽  
Radial Flow ◽  
Proton Exchange ◽  
Polarization Curves ◽  
Field Patterns ◽  
Exchange Membrane

scholarly journals Seeking minimum entropy production for a tree-like flow-field in a fuel cell

2020 ◽  
Vol 22 (13) ◽  
pp. 6993-7003 ◽  
Author(s):  
Marco Sauermoser ◽  
Signe Kjelstrup ◽  
Natalya Kizilova ◽  
Bruno G. Pollet ◽  
Eirik G. Flekkøy
Keyword(s):  
Fuel Cell ◽  
Flow Field ◽  
Entropy Production ◽  
Minimum Entropy ◽  
Murray's Law ◽  
Field Patterns ◽  
Murray’S Law ◽  
Minimum Entropy Production

We show how we can improve bio-inspired flow field patterns for use in PEMFCs by deviating from Murray's law.

Visual and sensorimotor cortices mapping during awake resection of lesion on the right periatrium: a case report on brainwaves and their peculiar patterns

2014 ◽  
Vol 2 (1-4) ◽  
Author(s):  
Zamzuri Idris ◽  
Ch’ng Chee How ◽  
Jafri Malin Abdullah
Keyword(s):  
Visual Field ◽  
Brain Mapping ◽  
New Technologies ◽  
Visual Stimulation ◽  
Brain Atlas ◽  
Brain Functions ◽  
Eloquent Areas ◽  
Neurosurgical Planning ◽  
Visual Field Deficits ◽  
Visual Evoked

AbstractAdvances in neurosurgery have allowed for more sophisticated mapping of various eloquent neural structures including the visual cortex. Applications of various modalities of new technologies allow accurate brain mapping for neurosurgical planning and preservation of functions in patients with lesions involving the eloquent cortex. The authors demonstrate the use of various new technologies for accurate presurgical planning, preservation of brain functions, and depiction of patterns of cortical brainwaves, which relate to motor networks and continuous visual stimuli.A patient with a right periatrial lesion involving the optic radiation with no visual field deficits was operated under an awake state and under continuous contralateral electrocorticography and visual monitoring. Presurgically, extra-operative brain mapping for visual-, sensory-, and motor-evoked magnetic fields were completed using magnetoencephalography (MEG). The dipole areas were identified, and the images were fused with a 116-region cortical brain atlas. The ideal trajectory was planned based on these images and diffusion tensor imaging (tractography). The trans-sulcal approachA good agreement for eloquent areas was identified based on extra-operative MEG and intra-operative neurostimulation mappings. The patient had no new neurological or visual-field deficits after the surgery. Certain patterns of brainwaves for motor cortex and visual stimulation were obtained: (a) spikes at the contralateral sensorimotor area when the motor strip was stimulated and (b) up-down and dense-loose continuous visual-evoked brainwaves at the occipital pole toward flashing checkerboard visual stimulation.A combination of extra- and intra-operative brain mappings should ideally be done in patients harboring lesions near eloquent areas. The continuous visual-evoked potential monitoring, using a grid electrode and flashing checkerboard and contralateral sensorimotor responses, observed in our case is interesting and needs further studies.

Induced Roll Vection from Stimulation of the Central Visual Field

1987 ◽  
Vol 31 (2) ◽  
pp. 263-265 ◽  
Author(s):  
George J. Andersen ◽  
Brian P. Dyre
Keyword(s):  
Visual Field ◽  
Visual Information ◽  
Visual Stimulation ◽  
Postural Instability ◽  
Flight Simulation ◽  
Limited Area ◽  
Central Visual Field ◽  
Forward Motion ◽  
Self Motion ◽  
Stimulation Of

An important consideration for some types of flight simulation is that sufficient visual information be provided for a perception of self-motion. A general conclusion of earlier research is that peripheral stimulation (outside a 30 deg. diameter area of the central visual field) is necessary for perceived self-motion to occur. More recently Andersen and Braunstein (1985) demonstrated that induced self-motion could occur when visual information simulating forward motion of the observer was presented to a limited area of the central visual field. In the present study, the perception of induced roll vection (rotation about the line of sight) from visual stimulation of the central visual field was examined. Subjects viewed computer generated displays that simulated observer motion relative to a volume of randomly positioned points. Two variables were examined: 1) the presence or absence of a simulated forward motion, and 2) the presence of a 15 deg. or 30 deg. sinusoidal roll motion. It was found that: 1) induced roll vection occurred with stimulation restricted to a 10 deg. diameter area of the central visual field; 2) greater postural instability occurred for displays with a 30 deg. roll as compared to a 15 deg. roll; and 3) significantly greater postural instability occurred along the X-axis (left/right) as compared to the Y-axis (front/back). The implications of this research for flight simulation will be discussed.

Decoding complex flow-field patterns in visual working memory

NeuroImage ◽  
2014 ◽  
Vol 91 ◽  
pp. 43-51 ◽  
Author(s):  
Thomas B. Christophel ◽  
John-Dylan Haynes
Keyword(s):  
Working Memory ◽  
Flow Field ◽  
Visual Working Memory ◽  
Complex Flow ◽  
Field Patterns
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