scholarly journals More than a cool illusion? Functional significance of self-motion illusion (circular vection) for perspective switches

2015 ◽  
Vol 6 ◽  
Author(s):  
Bernhard E. Riecke ◽  
Daniel Feuereissen ◽  
John J. Rieser ◽  
Timothy P. McNamara
Keyword(s):  
Functional Significance ◽  
Circular Vection ◽  
Self Motion

scholarly journals Moving sounds enhance the visually-induced self-motion illusion (circular vection) in virtual reality

2009 ◽  
Vol 6 (2) ◽  
pp. 1-27 ◽  
Author(s):  
Bernhard E. Riecke ◽  
Aleksander Väljamäe ◽  
Jörg Schulte-Pelkum
Keyword(s):  
Virtual Reality ◽  
Circular Vection ◽  
Self Motion

Effect of Stationary Objects on Illusory Forward Self-Motion Induced by a Looming Display

Perception ◽  
1988 ◽  
Vol 17 (1) ◽  
pp. 5-11 ◽  
Author(s):  
Masao Ohmi ◽  
Ian P Howard
Keyword(s):  
Inhibitory Effect ◽  
The Body ◽  
Body Motion ◽  
Depth Cues ◽  
Circular Vection ◽  
Stationary Objects ◽  
Self Motion ◽  
Stationary Background

It has previously been shown that when a moving and a stationary display are superimposed, illusory self-rotation (circular vection) is induced only when the moving display appears as the background. Three experiments are reported on the extent to which illusory forward self-motion (forward vection) induced by a looming display is inhibited by a superimposed stationary display as a function of the size and location of the stationary display and of the depth between the stationary and looming displays. Results showed that forward vection was controlled by the display that was perceived as the background, and background stationary displays suppressed forward vection by about the same amount whatever their size and eccentricity. Also, the perception of foreground — background properties of competing displays determined which controlled forward vection, and this control was not tied to specific depth cues. The inhibitory effect of a stationary background on forward vection was, however, weaker than that found with circular vection. This difference makes sense because, for forward body motion, the image of a distant scene is virtually stationary whereas, when the body rotates, it is not.

scholarly journals Rotating sound fields can facilitate biomechanical self-motion illusion ("circular vection")

2010 ◽  
Vol 9 (8) ◽  
pp. 714-714 ◽  
Author(s):  
B. E. Riecke ◽  
D. Feuereissen ◽  
J. J. Rieser
Keyword(s):  
Circular Vection ◽  
Sound Fields ◽  
Self Motion

Influence of fixation on circular vection

2000 ◽  
Vol 10 (3) ◽  
pp. 151-155
Author(s):  
Hiroaki Fushiki ◽  
Satoru Takata ◽  
Yukio Watanabe
Keyword(s):  
Vertical Axis ◽  
Constant Acceleration ◽  
Circular Vection ◽  
Hemispherical Dome ◽  
The Mean ◽  
Fixation Points ◽  
Self Motion ◽  
Random Dot Pattern ◽  
Normal Adults ◽  
Moving Pattern

The contribution of fixation to latency of circular vection (CV) was examined in twenty-five normal adults aged 18–30 years. For induction of self-motion a random dot pattern was projected onto a hemispherical dome. The pattern was rotated either about the subject’s vertical axis or about their interaural axis at a constant acceleration of 1 deg / s 2 . For the group tested, the perceived CV latencies were significantly shorter with fixation than without fixation in both horizontal and vertical CV. The effect of fixation was pronounced in subjects with longer latencies. The mean CV latencies for two different fixation points between the subject’s eyes and the moving pattern did not differ significantly. Our results suggest that the potential influence of fixation must be carefully controlled in studies of visually induced self-motion. Possible explanations for the effect of fixation on the generation of CV will also be discussed.

scholarly journals Stimulus Eccentricity and Spatial Frequency Interact to Determine Circular Vection

Perception ◽  
1998 ◽  
Vol 27 (9) ◽  
pp. 1067-1077 ◽  
Author(s):  
Stephen Palmisano ◽  
Barbara Gillam
Keyword(s):  
Spatial Frequency ◽  
Optic Flow ◽  
Peripheral Vision ◽  
High Spatial Frequency ◽  
Object Motion ◽  
Frequency Pattern ◽  
Circular Vection ◽  
Perception Of Self ◽  
Self Motion ◽  
Stimulus Eccentricity

While early research suggested that peripheral vision dominates the perception of self-motion, subsequent studies found little or no effect of stimulus eccentricity. In contradiction to these broad notions of ‘peripheral dominance’ and ‘eccentricity independence’, the present experiments showed that the spatial frequency of optic flow interacts with its eccentricity to determine circular vection magnitude—central stimulation producing the most compelling vection for high-spatial-frequency stimuli and peripheral stimulation producing the most compelling vection for lower-spatial-frequency stimuli. This interaction appeared to be due, in part at least, to the effect that the higher-spatial-frequency moving pattern had on subjects’ ability to organise optic flow into related motion about a single axis. For example, far-peripheral exposure to this high-spatial-frequency pattern caused many subjects to organise the optic flow into independent local regions of motion (a situation which clearly favoured the perception of object motion not self-motion). It is concluded that both high-spatial-frequency and low-spatial-frequency mechanisms are involved in the visual perception of self-motion—with their activities depending on the nature and eccentricity of the motion stimulation.

Directional preponderance in pitch circular vection

2000 ◽  
Vol 10 (2) ◽  
pp. 93-98
Author(s):  
H. Fushiki ◽  
S. Takata ◽  
K. Yasuda ◽  
Y. Watanabe
Keyword(s):  
Stimulus Presentation ◽  
Vertical Axis ◽  
Directional Asymmetry ◽  
Stripe Pattern ◽  
Circular Vection ◽  
Significant Difference ◽  
Perception Of Self ◽  
Self Motion ◽  
Random Dot Pattern ◽  
Rotational Stimulation

We used optokinetic stimulation (OKS) in eighteen normal adults aged 18–30 years to investigate vertical self-motion perception. In order to induce self-rotation, either a stripe pattern or a random dot pattern was projected onto the inner wall of a hemispherical dome with a diameter of 150 cm. The pattern was rotated either about the subject’s vertical axis (yaw) or about the subject’s interaural axis (pitch) for 80 s at a constant acceleration of 1 deg / s 2 . Stimuli were randomly repeated three to four times in each direction. The latency of onset as well as the perceived intensity of circular vection (CV) was measured for each stimulus presentation. CV latencies for upward rotational stimulation were significantly longer than those for downward rotational stimulation under both types of stimulus conditions. There was no significant difference in CV latency between rightward and leftward rotational stimulation. For most subjects, the magnitudes of the perceived CV for rightward rotational stimulation were equal to those for leftward rotational stimulation, whereas the magnitudes of the perceived CV for vertical stimulation showed large intersubject variability. These results provide additional evidence that fundamental differences exist between different types of self-motion. Possible explanations for the directional asymmetry in vertical perception of self-motion will also be discussed.

Functional significance of preserved color patterns of mollusks from the Gosport Sand (Eocene) of Alabama

1988 ◽  
Vol 62 (01) ◽  
pp. 83-87 ◽  
Author(s):  
Patricia H. Kelley ◽  
Charles T. Swann
Keyword(s):  
Functional Morphology ◽  
Functional Significance ◽  
Intraspecific Variability ◽  
Color Pattern ◽  
Color Patterns ◽  
Historical Factors ◽  
Life Mode ◽  
Molluscan Fauna ◽  
Excellent Preservation ◽  
Architectural Constraints

The excellent preservation of the molluscan fauna from the Gosport Sand (Eocene) at Little Stave Creek, Alabama, has made it possible to describe the preserved color patterns of 15 species. In this study the functional significance of these color patterns is tested in the context of the current adaptationist controversy. The pigment of the color pattern is thought to be a result of metabolic waste disposal. Therefore, the presence of the pigment is functional, although the patterns formed by the pigment may or may not have been adaptive. In this investigation the criteria proposed by Seilacher (1972) for testing the functionality of color patterns were applied to the Gosport fauna and the results compared with life mode as interpreted from knowledge of extant relatives and functional morphology. Using Seilacher's criteria of little ontogenetic and intraspecific variability, the color patterns appear to have been functional. However, the functional morphology studies indicate an infaunal life mode which would preclude functional color patterns. Particular color patterns are instead interpreted to be the result of historical factors, such as multiple adaptive peaks or random fixation of alleles, or of architectural constraints including possibly pleiotropy or allometry. The low variability of color patterns, which was noted within species and genera, suggests that color patterns may also serve a useful taxonomic purpose.

Complex Vesicles, Microtubules, and Cytoplasmic Filaments in the Endothelial Cells of Normal Dog Aorta

1968 ◽  
Vol 26 ◽  
pp. 172-173
Author(s):  
C. N. Sun ◽  
J. J. Ghidoni
Keyword(s):  
Electron Microscopy ◽  
Endothelial Cells ◽  
Cross Sections ◽  
Functional Significance ◽  
Tubular Structures ◽  
Aldehyde Fixation ◽  
Cytoplasmic Filaments

Endothelial cells in longitudinal and cross sections of aortas from 3 randomly selected “normal” mongrel dogs were studied by electron microscopy. Segments of aorta were distended with cold cacodylate buffered 5% glutaraldehyde for 10 minutes prior to being cut into small, well oriented tissue blocks. After an additional 1-1/2 hour period in glutaraldehyde, the tissue blocks were well rinsed in buffer and post-fixed in OsO4. After dehydration they were embedded in a mixture of Maraglas, D.E.R. 732, and DDSA.Aldehyde fixation preserves the filamentous and tubular structures (300 Å and less) for adequate demonstration and study. The functional significance of filaments and microtubules has been recently discussed by Buckley and Porter; the precise roles of these cytoplasmic components remains problematic. Endothelial cells in canine aortas contained an abundance of both types of structures.

Color effects on self-motion perception

2006 ◽  
Author(s):  
Frederick Bonato ◽  
Andrea Bubka
Keyword(s):  
Motion Perception ◽  
Self Motion
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