Visually Evoked Magnetic Field Induced by Ring Motion Aftereffect

Perception ◽  
1997 ◽  
Vol 26 (1_suppl) ◽  
pp. 301-301
Author(s):  
N Osaka ◽  
M Osaka ◽  
S Koyama ◽  
R Kakigi
Keyword(s):  
Magnetic Field ◽  
Goodness Of Fit ◽  
Visual Motion ◽  
Motion Aftereffect ◽  
Adaptation Period ◽  
Luminance Profile ◽  
The Subject ◽  
The Right ◽  
Clear Increase ◽  
Good Agreement

Motion aftereffect (MAE) is a negative aftereffect caused by prolonged viewing of visual motion: after gazing at a moving grating for a while, a stationary image will appear to move in the opposite direction (Ashida and Osaka, 1995 Vision Research35 1825). Evoked magnetic field (magnetoencephalogram: MEG) was measured when a human subject observing ring MAE in which concentric circles appear to contract continuously after viewing continuously expanding rings. The diameter of the stimulus was 20 deg with fixation point in the centre. The magnetic evoked field (80 averagings at a latency of 190 ms) was measured from 37 points over the occipital and parietal areas (Magnes SQUID biomagnetometer, BTi) while the subject was observing stationary rings after an adaptation period of 2 s at low spatial frequency (4 cycles deg−1, 4 Hz). The luminance profile was sinusoidally changed across rings. MRI image fitting (sagittal, coronal, and axial view) for each of four subjects, and dipole estimates obtained for equal magnetic field contours (with value of goodness of fit greater than 0.98) from the right brain hemisphere suggest that the main loci subserving MAE lie in the surrounding region over the lateral occipitotemporal areas in the human brain, close to area MT. This is in good agreement with another study with fMRI-based MAE measures [Tootell et al, 1995 Nature (London)375 139] in which a clear increase in activity in these areas was observed when subjects viewed MAE.

Evoked Magnetic Field Elicited by Motion and Motion Aftereffect

Perception ◽  
1996 ◽  
Vol 25 (1_suppl) ◽  
pp. 113-113
Author(s):  
N Osaka ◽  
H Ashida ◽  
M Osaka ◽  
S Koyama ◽  
R Kakigi
Keyword(s):  
Magnetic Field ◽  
Spatial Frequency ◽  
Human Subject ◽  
Visual Motion ◽  
Motion Aftereffect ◽  
Sinusoidal Grating ◽  
Negative Aftereffect ◽  
Motion Condition ◽  
Clear Increase ◽  
Good Agreement

Motion aftereffect (MAE) is a negative aftereffect caused by prolonged viewing of visual motion: after gazing at a moving grating for a while, a stationary image will appear to move in the opposite direction (Ashida and Osaka, 1995 Vision Research35 1825). Evoked magnetic field (magnetoencephalogram: MEG) was measured on a human subject observing visual motion and MAE. Magnetic evoked field (80 averagings) was measured from 37 points over occipital and parietal areas (Magnes SQUID biomagnetometer, BTi) during watching a horizontally moving sinusoidal grating with low spatial frequency (2 cycles deg−1 with 5 Hz: motion condition) and immediately after stopping the moving grating (MAE condition). Dipole estimates based on equal magnetic field contour suggest that the main loci subserving visual motion and MAE appear to be the surrounding region over occipital and parietal areas in the human brain. Further analysis is now underway. In general, this appears to be in good agreement with another study using fMRI-based MAE measures [Tootell et al, 1995 Nature (London)375 139] in which a clear increase in activity in these areas was observed when subjects viewed MAE.

Neuroimaging Analysis of Visual Motion

Perception ◽  
1997 ◽  
Vol 26 (1_suppl) ◽  
pp. 300-300
Author(s):  
M Osaka ◽  
N Osaka ◽  
S Koyama ◽  
R Kakigi
Keyword(s):  
Magnetic Field ◽  
Goodness Of Fit ◽  
Visual Motion ◽  
Human Subjects ◽  
Projection System ◽  
Research Systems ◽  
Cambridge Research ◽  
Stationary Frame ◽  
Dot Motion ◽  
The Right

The evoked magnetic field (magnetoencephalogram: MEG) was measured in human subjects observing random-dot motion. 600 random dots generated with VSG2/3 (Cambridge Research Systems) moved at about 10 deg s−1 (either in the 45° or the 135° direction). The motion frame (5 s) was followed by a stationary frame on a screen (projected from Barcodata 3100 projection system) subtending a visual angle of about 20 deg × 20 deg. Six subjects observed the motion frame presented in the left visual field. The magnetic evoked field (80 averagings) was measured from 37 points over occipital, temporal, and parietal areas (Magnes SQUID biomagnetometer, BTi) of the right brain hemisphere. Dipole estimates based on equal magnetic field contours (190 ms after motion frame onset with value of goodness of fit greater than 0.95) and MRI image fitting (sagittal, coronal, and axial view) for each subject suggest that the main loci subserving motion perception lie in the surrounding region over occipital, temporal, and parietal junction areas in the human brain close to area MT.

A Neuromagnetic View of the Human Visual Brain

Perception ◽  
1997 ◽  
Vol 26 (1_suppl) ◽  
pp. 25-25
Author(s):  
S Vanni
Keyword(s):  
Visual Motion ◽  
Occipital Cortex ◽  
Task Demands ◽  
Cortical Activation ◽  
Visual Object ◽  
Source Regions ◽  
The Right ◽  
Visual Object Naming ◽  
The Brain ◽  
Good Agreement

A visual stimulus typically activates several cortical areas, both sequentially and overlapping in time. Characterisation of this temporal activation sequence has significantly improved with the recent development of whole-scalp neuromagnetometers. The magnetoencephalographic (MEG) signals mainly arise from time-locked cortical activity. Although the spatial localisation of several simultaneously active areas is ambiguous because of the non-uniqueness of the inverse problem, the comparison of estimated source regions across observers and utilisation of previous functional knowledge can usually resolve this ambiguity. Visual object naming, for example, generates cortical activation progressing bilaterally from occipital to temporal and frontal lobes. Simultaneously, the parieto-occipital alpha rhythm dampens as a function of task demands. Similarly, this rhythm is at a lower level after objects than non-objects in an object-detection task, which suggests that the parieto-occipital area is active when attending to visual form. In addition, this area generates evoked responses after voluntary blinks, saccades, and luminance increments, which in turn suggests that it participates in the updating of visual percepts. The sources of extrastriate MEG signals are generally in good agreement with the location of activation found with other imaging methods: visual motion activates the V5 in the ascending limb of the inferior temporal sulcus, faces the ventral temporo-occipital cortex, and objects the lateral occipital (LO) regions. Interestingly, the strength of the right LO activity closely follows the proportion of correctly detected objects. The future neuromagnetic studies will focus not only on functional localisation of the active areas, but also on how the brain processes various stimuli.

Strength of Motion Aftereffect Varies with Segregation of Test Field and Surround

Perception ◽  
1996 ◽  
Vol 25 (1_suppl) ◽  
pp. 64-64 ◽  
Author(s):  
J P Harris ◽  
D Sullivan
Keyword(s):  
Visual Motion ◽  
Test Pattern ◽  
Motion Aftereffect ◽  
Auditory Signal ◽  
Test Field ◽  
Rectangular Window ◽  
Stationary Test ◽  
Two Measures ◽  
Motion Detectors ◽  
Good Agreement

It is widely accepted that the motion aftereffect (MAE) results from the adaptation of visual motion detectors. However, recent work suggests that how the effects of that adaptation are expressed (the nature of the perceived MAE) depends on the nature of the inducing and test fields. We investigated how the strength of the MAE varied with the nature of the boundary between the test field and the surround. The surround (18.5 deg wide × 13.5 deg high) to the adapting and test fields was an area of vertical square-wave grating of 0.7 cycle deg−1. During adaptation, vertical stripes of the same spatial frequency as the background moved horizontally at a speed of 2 deg s−1 for 14 s within a central rectangular window of 9.7 deg wide × 7.6 deg high. At the end of adaptation, one of six different test fields was presented in the central window. In three of these, the stationary test stripes were exactly aligned with the surrounding stripes, and in the other three they were offset by half a stripe width. For two of these conditions (one aligned, one offset), a black outline was drawn around the edge of the adapting window (and so was visible only where it crossed white areas), and for two others (one aligned, one offset) the outline was red, and so visible in its entirety. The strength of MAEs in twelve subjects was assessed both by ratings at an auditory signal which occurred 0.5 s after the end of adaptation and also by measurement of their durations. There was good agreement between these two measures. MAEs were significantly stronger on the offset than on the aligned test fields. The presence of an outline increased MAE strength compared with no outline, but these outline effects were much weaker than those of offsetting the test stripes from the surround. We suggest that the MAE depends in part on the presence of a visually separable test pattern to which motion may be allocated.

Materials for Electron Beam Information Storage

1969 ◽  
Vol 27 ◽  
pp. 152-153 ◽  
Author(s):  
D. E. Speliotis
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Recent Literature ◽  
Electron Beams ◽  
Information Storage ◽  
The Subject ◽  
The Magnetic Field

The interaction of electron beams with a large variety of materials for information storage has been the subject of numerous proposals and studies in the recent literature. The materials range from photographic to thermoplastic and magnetic, and the interactions with the electron beam for writing and reading the information utilize the energy, or the current, or even the magnetic field associated with the electron beam.

Contemporary Machiavellian theses "The strategy of the role of the absurd state as a model"

2020 ◽  
pp. 3
Author(s):  
Ali Hussein Hameed ◽  
Saif Hayder AL.Husainy
Keyword(s):  
International Relations ◽  
Decision Maker ◽  
Turning Point ◽  
Information Revolution ◽  
Main Hypothesis ◽  
The Subject ◽  
Area Of Influence ◽  
The Right ◽  
Modern Technologies

In the anarchism that governs the nature and patterns of international relations characterized by instability and uncertainty in light of several changes, as well as the information revolution and the resulting developments and qualitative breakthroughs in the field of scientific and advanced technological knowledge and modern technologies.  All of these variables pushed toward the information flow and flow tremendously, so rationality became an indispensable matter for the decision maker as he faces these developments and changes. There must be awareness and rationality in any activity or behavior because it includes choosing the best alternative and making the right decision and selecting the information accurately and mental processing Through a mental system based on objectivity, methodology, and accumulated experience away from idealism and imagination, where irrationality and anarchy are a reflection of the fragility of the decision-maker, his lack of awareness of the subject matter, his irresponsibility, and recklessness that inevitably leads to failure by wasting time and Effort and potential. The topic acquires its importance from a search in the strategies of the frivolous state and its characteristics with the ability to influence the regional, and what it revealed is a turning point in how to adapt from the variables and employ them to their advantage and try to prove their existence. Thus, the problem comes in the form of a question about the possibility of the frivolous state in light of the context of various regional and international events and trends. The answer to this question stems from the main hypothesis that (the aim which the frustrating state seeks to prove is that it finds itself compelled to choose several strategies that start from the nature of its characteristics and the goals that aim at it, which are centered in the circle of its interests in the field of its struggle for the sake of its survival and area of influence).

Strategi Humas Partai Gerindra dalam Membangun Citra Partai pada Pemilu 2014

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Rialdo Rezeky ◽  
Muhammad Saefullah
Keyword(s):  
Data Collection ◽  
Public Relations ◽  
Media Relations ◽  
Executive Board ◽  
The Public ◽  
Community Or ◽  
The Subject ◽  
Main Components ◽  
The Right ◽  
Participatory Observation

The approach of this research is qualitative and descriptive. In this study those who become the subject of research is an informant (key figure). The subject of this study is divided into two main components, consisting of internal public and external public that is from the Board of the Central Executive Board of Gerindra Party, Party Cadres, Observers and Journalists. The object of this research is the behavior, activities and opinions of Gerindra Party Public Relation Team. In this study used data collection techniques with interviews, participatory observation, and triangulation of data. The results of this study indicate that the Public Relations Gerindra has implemented strategies through various public relations programs and establish good media relations with the reporters so that socialization goes well. So also with the evaluation that is done related to the strategy of the party. The success of Gerindra Party in maintaining the party’s image in Election 2014 as a result of the running of PR strategy and communication and sharing the right type of program according to the characteristics of the voting community or its constituents.Keywords: PR Strategy, Gerindra Party, Election 2014

PENILAIAN AUTENTIK PADA MATAPELAJARAN PENDIDIKAN AGAMA ISLAM

Edupedia ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 77-85
Author(s):  
Mohamad Aso Samsudin ◽  
Ukhtul Iffah
Keyword(s):  
Islamic Education ◽  
Authentic Assessments ◽  
Measurement Tools ◽  
The Subject ◽  
The Right

Teaching is an art means that the art of managing people who have a variety of different characters. The teacher should be able to recognize these different characters so that he can easily master them so that the subject is easily mastered by them. However, the teacher is not easy to do that. It is no less difficult in learning to do assessment, because when assessment teachers are required to be careful and meticulous so that the results are not wrong, be careful in determining appropriate measurement tools as measured, or careful in operating the right tools, especially teachers are required able to do a complete assessment (authentic) in three domains (cognitive, psychomotor, and affective). This article reviews how to carry out authentic assessments in Islamic Education (Pendidikan Agama Islam) learning.

Right and Wrong from the Standpoint of G. W. Hegel

2020 ◽  
Vol 9 ◽  
pp. 5-13
Author(s):  
V. V. Ershov ◽  
Keyword(s):  
The Subject ◽  
The Right

The subject of the article is the right and «wrong» from the standpoint of G. W. Hegel and other researchers. H. W. Hegel refers the «wrong» to the «unreal» right, which should «gradually disappear». In the article, first of all, legal and individual regulators of legal relations are distinguished. Secondly, the «wrong» refers to a type of individual regulators of legal relations, which have distinctive objective features from the right.

scholarly journals Legal and Technical Feasibility of the GDPR’s Quest for Explanation of Algorithmic Decisions: of Black Boxes, White Boxes and Fata Morganas

2020 ◽  
Vol 11 (1) ◽  
pp. 18-50 ◽  
Author(s):  
Maja BRKAN ◽  
Grégory BONNET
Keyword(s):  
Decision Making ◽  
Interdisciplinary Approach ◽  
Practical Implementation ◽  
General Data Protection Regulation ◽  
Legal Limits ◽  
Black Boxes ◽  
General Data ◽  
The Subject ◽  
The Right ◽  
Automated Decision Making

Understanding of the causes and correlations for algorithmic decisions is currently one of the major challenges of computer science, addressed under an umbrella term “explainable AI (XAI)”. Being able to explain an AI-based system may help to make algorithmic decisions more satisfying and acceptable, to better control and update AI-based systems in case of failure, to build more accurate models, and to discover new knowledge directly or indirectly. On the legal side, the question whether the General Data Protection Regulation (GDPR) provides data subjects with the right to explanation in case of automated decision-making has equally been the subject of a heated doctrinal debate. While arguing that the right to explanation in the GDPR should be a result of interpretative analysis of several GDPR provisions jointly, the authors move this debate forward by discussing the technical and legal feasibility of the explanation of algorithmic decisions. Legal limits, in particular the secrecy of algorithms, as well as technical obstacles could potentially obstruct the practical implementation of this right. By adopting an interdisciplinary approach, the authors explore not only whether it is possible to translate the EU legal requirements for an explanation into the actual machine learning decision-making, but also whether those limitations can shape the way the legal right is used in practice.

Sign in / Sign up

Export Citation Format

Share Document