scholarly journals Illusory position shift induced by plaid motion

2010 ◽  
Vol 9 (8) ◽  
pp. 689-689
Author(s):  
R. Hisakata ◽  
I. Murakami
Keyword(s):  
Plaid Motion ◽  
Position Shift

scholarly journals Illusory position shift induced by plaid motion

2009 ◽  
Vol 49 (24) ◽  
pp. 2902-2910 ◽  
Author(s):  
Rumi Hisakata ◽  
Ikuya Murakami
Keyword(s):  
Plaid Motion ◽  
Position Shift

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 Perceived duration of plaid motion increases with pattern speed rather than component speed

2012 ◽  
Vol 12 (4) ◽  
pp. 1-1 ◽  
Author(s):  
K. Yamamoto ◽  
K. Miura
Keyword(s):  
Plaid Motion ◽  
Pattern Speed ◽  
Perceived Duration

scholarly journals Illusory position shift induced by motion within a moving envelope during smooth-pursuit eye movements

2013 ◽  
Vol 13 (12) ◽  
pp. 21-21 ◽  
Author(s):  
R. Hisakata ◽  
M. Terao ◽  
I. Murakami
Keyword(s):  
Eye Movements ◽  
Smooth Pursuit ◽  
Smooth Pursuit Eye Movements ◽  
Pursuit Eye Movements ◽  
Position Shift

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

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

scholarly journals Monocular mechanisms determine plaid motion coherence

1996 ◽  
Vol 13 (4) ◽  
pp. 615-626 ◽  
Author(s):  
David Alais ◽  
Maarten J. van der Smagt ◽  
Frans A. J. Verstraten ◽  
W. A. van de Grind
Keyword(s):  
Cortical Area ◽  
The Other ◽  
Coherent Motion ◽  
Spatial Period ◽  
Two Dimensional ◽  
Middle Temporal ◽  
Spatial Frequencies ◽  
Motion Coherence ◽  
Plaid Motion ◽  
Feature Based

AbstractAlthough the neural location of the plaid motion coherence process is not precisely known, the middle temporal (MT) cortical area has been proposed as a likely candidate. This claim rests largely on the neurophysiological findings showing that in response to plaid stimuli, a subgroup of cells in area MT responds to the pattern direction, whereas cells in area V1 respond only to the directions of the component gratings. In Experiment 1, we report that the coherent motion of a plaid pattern can be completely abolished following adaptation to a grating which moves in the plaid direction and has the same spatial period as the plaid features (the so-called “blobs”). Interestingly, we find this phenomenon is monocular: monocular adaptation destroys plaid coherence in the exposed eye but leaves it unaffected in the other eye. Experiment 2 demonstrates that adaptation to a purely binocular (dichoptic) grating does not affect perceived plaid coherence. These data suggest several conclusions: (1) that the mechanism determining plaid coherence responds to the motion of plaid features, (2) that the coherence mechanism is monocular, and thus (3), that it is probably located at a relatively low level in the visual system and peripherally to the binocular mechanisms commonly presumed to underlie two-dimensional (2-D) motion perception. Experiment 3 examines the spatial tuning of the monocular coherence mechanism and our results suggest it is broadly tuned with a preference for lower spatial frequencies. In Experiment 4, we examine whether perceived plaid direction is determined by the motion of the grating components or the features. Our data strongly support a feature-based model.

scholarly journals Illumination encoding in face recognition: effect of position shift

10.1167/3.2.4 ◽  
2003 ◽  
Vol 3 (2) ◽  
pp. 4 ◽  
Author(s):  
Wendy L. Braje
Keyword(s):  
Face Recognition ◽  
Position Shift
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