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At least 1,333 records · Page 74Linked to original sources
PubMed1998

Perception of spatial orientation in microgravity.

Experiments during space and parabolic flights have shown that human spatial orientation in microgravity differs to a significant extent from its performance on earth. Due to the missing reference of gravitational force, unusual perceptual phenomena are observed, from inversion illusions to errors of perceived motion and position with respect to the spacecraft. This article gives an overview of results collected from space missions and parabolic flight campaigns, and proposes new lines of research about the perceptual phenomena of spatial orientation in microgravity. It is shown that most of the disorientation phenomena can be explained by the existence of an internal estimate of the gravitational vertical. In microgravity it is still maintained, but incorrectly updated, and thus alters the processing of sensory information in the central nervous system. This in turn leads to the observed illusions, and probably also facilitates space motion sickness.

Humans↗
PubMed1997

Judgments of the distance to nearby virtual objects: interaction of viewing conditions and accommodative demand.

Ten subjects adjusted a real-object probe to match the distance of nearby virtual objects optically presented via a see-through, helmet-mounted display. Monocular, binocular, and stereoscopic viewing conditions were used with two levels of required focus. Observed errors may be related to changes in the subjects' binocular convergence. The results suggest ways in which virtual objects may be presented with improved spatial fidelity.

Computer Graphics↗
PubMed1991

Perception of linear acceleration in weightlessness.

Tests of the perception and use of linear acceleration sensory information were performed on the science crews of the Spacelab 1 (SL-1) and D-1 missions using linear "sleds" in-flight (D-1) and pre-post flight. The time delay between the acceleration step stimulus and the subjective response was consistently reduced during weightlessness, but was neither statistically significant nor of functional importance. Increased variability of responses when going from one environment to the other was apparent from measurements on the first day of the mission and in the first days post-flight. Subjective report of perceived motion during sinusoidal oscillation in weightlessness were qualitatively similar to reports on earth. In a closed-loop motion nulling task, enhanced performance was observed post-flight in all crewmembers tested in the Y or Z axes.

Acceleration↗