scholarly journals The attenuation of perceived motion smear during combined eye and head movements

2006 ◽  
Vol 46 (26) ◽  
pp. 4387-4397 ◽  
Author(s):  
Jianliang Tong ◽  
Saumil S. Patel ◽  
Harold E. Bedell
Keyword(s):  
Head Movements ◽  
Perceived Motion

Perceived Depth from Dot Density Change by Lateral Head Movements

Perception ◽  
1996 ◽  
Vol 25 (1_suppl) ◽  
pp. 133-133 ◽  
Author(s):  
K Sakurai ◽  
H Ono
Keyword(s):  
Sine Wave ◽  
Visual Input ◽  
Head Movements ◽  
Trade Off ◽  
Rocking Motion ◽  
Dot Density ◽  
Wave Surfaces ◽  
Perceived Motion ◽  
Random Dot Pattern ◽  
Lateral Head

We investigated whether there is a trade-off between magnitude of perceived depth and that of perceived motion, using density changes (expansion/contraction) in a random-dot pattern yoked to lateral head movements. We simulated sine-wave surfaces with a depth of 0, 1, 2, 4, 8, and 16 cm. Subjects viewed the patterns monocularly while moving their heads from side to side laterally, and reported the magnitude of perceived depth and that of perceived motion. When simulated depth was less than 4 cm, the surfaces looked stationary and the amount of perceived depth was the same as that of simulated depth. When it was more than 4 cm, the surfaces appeared to move in a rocking motion and the amount of perceived depth was smaller than that of simulated depth. The trade-off implies a mechanism which transduces single visual input into depth or motion.

Motion Parallax Driven by Head Movements: Conditions for Visual Stability, Perceived Depth, and Perceived Concomitant Motion

Perception ◽  
10.1068/p5221 ◽  
2005 ◽  
Vol 34 (4) ◽  
pp. 477-490 ◽  
Author(s):  
Hiroshi Ono ◽  
Hiroyasu Ujike
Keyword(s):  
Motion Perception ◽  
Depth Perception ◽  
Head Movement ◽  
Motion Parallax ◽  
Head Movements ◽  
Visual Stability ◽  
Movement Velocity ◽  
Motion Threshold ◽  
Perceived Motion

Yoking the movement of the stimulus on the screen to the movement of the head, we examined visual stability and depth perception as a function of head-movement velocity and parallax. In experiment 1, for different head velocities, observers adjusted the parallax to find (a) the depth threshold and (b) the concomitant-motion threshold. Between these thresholds, depth was seen with no perceived motion. In experiment 2, for different head velocities, observers adjusted the parallax to produce the same perceived depth. A slower head movement required a greater parallax to produce the same perceived depth as faster head movements. In experiment 3, observers reported the perceived depth for different parallax magnitudes. Perceived depth covaried with smaller parallax without motion perception, but began to decrease with larger parallax and concomitant motion was seen. Only motion was seen with the larger parallax.

Role of pinnae and head movements in localizing pure tones 1The authors would like to thank Mr. Remi Humbert for implementing the experiment in Turbo Pascal and for his further assistance.

1999 ◽  
Vol 58 (3) ◽  
pp. 170-179 ◽  
Author(s):  
Barbara S. Muller ◽  
Pierre Bovet
Keyword(s):  
Sound Source ◽  
Head Movement ◽  
Movement Analysis ◽  
Head Movements ◽  
Sound Sources ◽  
Localization Accuracy ◽  
Sound Effects ◽  
Posterior Quadrant ◽  
Localization Performance ◽  
Pure Tones

Twelve blindfolded subjects localized two different pure tones, randomly played by eight sound sources in the horizontal plane. Either subjects could get information supplied by their pinnae (external ear) and their head movements or not. We found that pinnae, as well as head movements, had a marked influence on auditory localization performance with this type of sound. Effects of pinnae and head movements seemed to be additive; the absence of one or the other factor provoked the same loss of localization accuracy and even much the same error pattern. Head movement analysis showed that subjects turn their face towards the emitting sound source, except for sources exactly in the front or exactly in the rear, which are identified by turning the head to both sides. The head movement amplitude increased smoothly as the sound source moved from the anterior to the posterior quadrant.

Comparison of Quantified Ipsilateral and Contralateral Head Movements in Patients with Frontal and Temporal Lobe Epilepsies

2004 ◽  
Vol 35 (03) ◽  
Author(s):  
P Wagner ◽  
J Cunha ◽  
C Mauerer ◽  
C Vollmar ◽  
B Feddersen ◽  
...  
Keyword(s):  
Temporal Lobe ◽  
Head Movements

Carotid Artery Dynamics During Head Movements: A Reason for Concern With Regard to Carotid Stenting?

2003 ◽  
Vol 10 (5) ◽  
pp. 862-869 ◽  
Author(s):  
A. W. Floris Vos ◽  
Matteus A. M. Linsen ◽  
J. Tim Marcus ◽  
Jos C. van den Berg ◽  
Jan Albert Vos ◽  
...  
Keyword(s):  
Carotid Artery ◽  
Carotid Stenting ◽  
Head Movements

Postural Control during Downward Head Movements in Young Subjects

2007 ◽  
Vol 29 (3) ◽  
pp. 205-212
Author(s):  
Junko Fukushima ◽  
Tadayoshi Asaka ◽  
Natsumi Ikeda ◽  
Yumi Ito
Keyword(s):  
Postural Control ◽  
Head Movements ◽  
Young Subjects
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