scholarly journals Motion-induced position shift in stereoscopic and dichoptic viewing

2016 ◽  
Vol 16 (13) ◽  
pp. 3 ◽  
Author(s):  
Rumi Hisakata ◽  
Daisuke Hayashi ◽  
Ikuya Murakami
Keyword(s):  
Dichoptic Viewing ◽  
Position Shift

scholarly journals Motion-induced position shift in stereoscopic and dichoptic viewing

2013 ◽  
Vol 13 (9) ◽  
pp. 452-452
Author(s):  
R. Hisakata ◽  
I. Murakami
Keyword(s):  
Dichoptic Viewing ◽  
Position Shift

Strength of Suppression in Binocular Rivalry Immediately after Onset and Offset of Suppressing Pattern

1987 ◽  
Vol 65 (2) ◽  
pp. 515-523 ◽  
Author(s):  
Tamotsu Sohmiya ◽  
Kazuko Sohmiya
Keyword(s):  
Human Brain ◽  
Binocular Rivalry ◽  
Light Stimulus ◽  
Physiological Data ◽  
Temporal Properties ◽  
Dichoptic Viewing

If the dichoptic viewing method is used to analyze functions of the human brain rather than binocular rivalry itself, temporal properties of suppression come up as an important problem. To clarify the properties, a method in which test and suppressing patterns can be presented on any temporal condition was devised. When the suppressing pattern was flickered, the strength of suppression immediately after the onset of the pattern approached a maximum at the intercycle interval of 3 sec. It also increased with the increasing duration of exposure and reached a maximum at about 100 msec. The strength of suppression immediately after the offset decreased rapidly but continuously as time went on. These results indicate that the on-effect is produced by the presentation of the suppressing pattern, not the off-effect by its removal, whereas physiological data generally show the strong effect both at “on” and “off” of a light stimulus.

scholarly journals When brain damage “improves” perception: neglect patients can localize motion-shifted probes better than controls

2015 ◽  
Vol 114 (6) ◽  
pp. 3351-3358 ◽  
Author(s):  
Stefania de Vito ◽  
Marine Lunven ◽  
Clémence Bourlon ◽  
Christophe Duret ◽  
Patrick Cavanagh ◽  
...  
Keyword(s):  
Right Hemisphere ◽  
Visual Fields ◽  
Critical Factor ◽  
Significant Shift ◽  
Stimulus Motion ◽  
Attentional Processes ◽  
Position Shift ◽  
The Right ◽  
High Level ◽  
Better Than

When we look at bars flashed against a moving background, we see them displaced in the direction of the upcoming motion (flash-grab illusion). It is still debated whether these motion-induced position shifts are low-level, reflexive consequences of stimulus motion or high-level compensation engaged only when the stimulus is tracked with attention. To investigate whether attention is a causal factor for this striking illusory position shift, we evaluated the flash-grab illusion in six patients with damaged attentional networks in the right hemisphere and signs of left visual neglect and six age-matched controls. With stimuli in the top, right, and bottom visual fields, neglect patients experienced the same amount of illusion as controls. However, patients showed no significant shift when the test was presented in their left hemifield, despite having equally precise judgments. Thus, paradoxically, neglect patients perceived the position of the flash more veridically in their neglected hemifield. These results suggest that impaired attentional processes can reduce the interaction between a moving background and a superimposed stationary flash, and indicate that attention is a critical factor in generating the illusory motion-induced shifts of location.

scholarly journals Upper nasal hemifield location and nonspatial auditory tones accelerate visual detection during dichoptic viewing

PLoS ONE ◽  
2018 ◽  
Vol 13 (7) ◽  
pp. e0199962
Author(s):  
Terhi Mustonen ◽  
Mikko Nuutinen ◽  
Lari Vainio ◽  
Jukka Häkkinen
Keyword(s):  
Visual Detection ◽  
Dichoptic Viewing

M-ary phase position shift keying with orthogonal signalling

2015 ◽  
Vol 9 (13) ◽  
pp. 1627-1634 ◽  
Author(s):  
Conghui Lu ◽  
Lenan Wu ◽  
Peng Chen ◽  
Jiwu Wang ◽  
Huaping Liu
Keyword(s):  
Shift Keying ◽  
Position Shift

Short-latency disparity vergence responses and their dependence on a prior saccadic eye movement

1996 ◽  
Vol 75 (4) ◽  
pp. 1392-1410 ◽  
Author(s):  
C. Busettini ◽  
F. A. Miles ◽  
R. J. Krauzlis
Keyword(s):  
Eye Movement ◽  
Visual Stimulation ◽  
Full Range ◽  
Saccadic Eye Movement ◽  
Dichoptic Viewing ◽  
Visual Enhancement ◽  
Peak Enhancement ◽  
Uncrossed Disparity ◽  
Ocular Following ◽  
The Right

1. A dichoptic viewing arrangement was used to study the initial vergence eye movements elicited by brief horizontal disparity steps applied to large textured patterns in three rhesus monkeys. Disconjugate steps (range, 0.2-10.9 degrees) were applied to the patterns at selected times (range, 13-303 ms) after 10 degrees leftward saccades into the center of the pattern. The horizontal and vertical positions of both eyes were recorded with the electromagnetic search coil technique. 2. Without training or reinforcement, disparity steps of suitable amplitude consistently elicited vergence responses at short latencies. For example, with 1.8 degrees crossed-disparity steps applied 26 ms after the centering saccade, the mean latency of onset of convergence for each of the three monkeys was 52.2 +/- 3.8 (SD) ms, 52.3 +/- 5.2 ms, and 53.4 +/- 4.1 ms. 3. Experiments in which the disparity step was confined to only one eye indicated that each eye was not simply tracking the apparent motion that is saw. For example, when crossed-disparity steps were confined to the right eye (which saw leftward steps), the result was (binocular) convergence in which the left eye moved to the right even though that eye had seen only a stationary scene. This movement of the left eye cannot have resulted from independent monocular tracking and indicates that the vergences here derived from the binocular misalignment of the two retinal images. 4. The initial vergence responses to crossed-disparity steps had the following main features. 1) They were always in the correct (i.e., convergent) direction over the full range of stimuli tested, the initial vergence acceleration increasing progressively with increases in disparity until reaching a peak with steps of 1.4-2.4 degrees and declining thereafter to a nonzero asymptote as steps exceeded 5-7 degrees. 2) They showed transient postsaccadic enhancement whereby steps applied in the immediate wake of a saccadic eye movement resulted in much higher initial vergence accelerations than the same steps applied some time later. The response decline in the wake of a saccade was roughly exponential with time constants of 67 +/- 5 (SD) ms, 35 +/- 2 ms, and 54 +/- 4 ms for the three animals. 3) That the postsaccadic enhancement might have resulted in part from the visual stimulation associated with the prior saccade was suggested by the finding that enhancement could also be observed when the disparity steps were applied in the wake of (conjugate) saccadelike shifts of the textured pattern. However, this visual enhancement did not reach a peak unit 17-37 ms after the end of the "simulated" saccade, and the peak enhancement averaged only 45% of that after a "real" saccade. 4) Qualitatively similar transient enhancements in the wake of real and simulated saccades have also been reported for initial ocular following responses elicited by conjugate drifts of the visual scene. We replicated the enhancement effects on ocular following to allow a direct comparison with the enhancement effects on disparity vergence using the same animals and visual stimulus patterns and, despite some clear quantitative differences, we suggest that the enhancement effects share a similar etiology. 5. Initial vergence responses to uncrossed-disparity steps had the following main features. 1) They were in the correct (i.e., divergent) direction only for very small steps (< 1.5-2.5 degrees), and then only when postsaccadic delays were small; when the magnitude of the steps was increased beyond these levels, responses declined to zero and thereafter reversed direction, eventually reaching a nonzero (convergent) asymptote similar to that seen with large crossed-disparity steps; convergent responses were also seen with larger vertical disparity steps, suggesting that they represent default responses to any disparity exceeding a few degrees. 2) As the postsaccadic delay was increased, responses to small steps (1.8 degrees) declined to zero and thereafter re

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