Donovan G. Govan

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There has been no direct examination of stereoscopic depth perception at very large observation distances and depths. We measured perceptions of depth magnitude at distances where it is frequently reported without evidence that stereopsis is non-functional. We adapted methods pioneered at distances up to 9 m by R. S. Allison, B. J. Gillam, and E. Vecellio(More)
Although much has been learned about the spatial sampling and filtering properties of peripheral vision, little attention has been paid to the remarkably clear appearance of the peripheral visual field. To study the apparent sharpness of stimuli presented in the periphery, we presented Gaussian blurred horizontal edges at 8.3, 16.6, 24, 32, and 40 deg(More)
We measured binocular rivalry between dichoptic, orthogonal, sinusoidal gratings both having spatial frequencies of 0.5, 1, 2, 4, 8 or 16 c deg-1 in fields ranging from 0.5 to 8 deg of visual angle in diameter. Total time that one or the other grating was exclusively visible had an inverted U-shaped relationship with spatial frequency, with the peak(More)
BACKGROUND This study examined the effects of display lag and gain on visual self-motion perception (i.e., vection) in active observers. METHODS Our subjects viewed displays simulating self-motion in depth while physically oscillating their heads from side to side at approximately 1 Hz. Their horizontal head movements were recorded and incorporated into(More)
This paper presents a new approach of dynamic symmetric key distribution for encrypting the communication between two nodes in a wireless sensor network. The distribution of a shared key can be performed by any sensor node and does not always require that it is performed by the base station. Each node can be selected by one of its neighbor nodes in order to(More)
Static and dynamic observers provided binocular and monocular estimates of the depths between real objects lying well beyond interaction space. On each trial, pairs of LEDs were presented inside a dark railway tunnel. The nearest LED was always 40 m from the observer, with the depth separation between LED pairs ranging from 0 up to 248 m. Dynamic binocular(More)
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