Searched for: subject%3A%22spatial%255C%2Borientation%22
(1 - 20 of 20)
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Correia Grácio, B.J. (author), de Winkel, K.N. (author), Groen, E.L. (author), Wentink, M. (author), Bos, J.E. (author)
Without visual feedback, humans perceive tilt when experiencing a sustained linear acceleration. This tilt illusion is commonly referred to as the somatogravic illusion. Although the physiological basis of the illusion seems to be well understood, the dynamic behavior is still subject to discussion. In this study, the dynamic behavior of the...
article 2013
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de Winkel, K.N. (author), Clément, G. (author), Groen, E.L. (author), Werkhoven, P.J. (author)
Although the mechanisms of neural adaptation to weightlessness and re-adaptation to Earth-gravity have received a lot of attention since the first human space flight, there is as yet little knowledge about how spatial orientation is affected by partial gravity, such as lunar gravity of 0.16. g or Martian gravity of 0.38. g. Up to now twelve...
article 2012
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Correia Grácio, B.J. (author), Bos, J.E. (author)
Humans are able to estimate the vertical direction of an Earth fixed reference frame, which estimate is known as the subjective vertical (SV). To identify the SV, a distinction must be made between accelerations due to self-motion and gravity. Previous studies on this topic measured the SV using a variety of methods possibly affecting the...
article 2012
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Bles, W. (author), Groen, E. (author), TNO Defensie en Veiligheid (author)
The research facility DESDEMONA features a unique motion platform, combining a fully gimbaled cabin with the capability of producing sustained g-loads. Originally designed for ground-based simulation as well as training of spatial disorientation in aviation, the motion capabilities are also interesting for other areas. In this paper we will...
article 2009
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Koelewijn, T. (author), Bronkhorst, A. (author), Theeuwes, J. (author), TNO Defensie en Veiligheid (author)
There is debate in the crossmodal cueing literature as to whether capture of visual attention by means of sound is a fully automatic process. Recent studies show that when visual attention is endogenously focused sound still captures attention. The current study investigated whether there is interaction between exogenous auditory and visual...
article 2009
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van Linden, S. (author), Cremers, A.H.M. (author), TNO Defensie en Veiligheid (author)
The present study investigates the proficiency levels of functionally illiterate persons regarding a number of cognitive skills (language processing skills (reading, writing, listening), visual organizational and visual memory skills, mental spatial orientation, speed of cognitive processing, vigilance, divided attention and perceived self...
conference paper 2008
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TNO Defensie en Veiligheid (author)
Acclimatization ; Aerospace medicine ; Attitude indicators ; Aviation accidents ; Flight maneuvers ; Flight simulators ; Human factors engineering ; Orientation ; Perception ; Physiological effects ; Pilot training ; Pilots (personnel) ; Responses ; Reviews ; Situational awareness ; Spatial disorientation ; Spatial information ; Spatial...
conference paper 2008
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van Erp, J.B.F. (author), van Veen, H.A.H.C. (author), Ruijsendael, M. (author), TNO Defensie en Veiligheid (author)
Data show that spatial orientation in microgravity differs from that on Earth possibly facilitating space motion sickness and degrading performance. As a technology demonstration, we developed a Tactile Orientation Awareness Support Tool (TOAST) consisting of a vest with 56 vibrators. TOAST presents an artificial gravity vector by a localised...
article 2007
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van Erp, J.B.F. (author), van Veen, H.A.H.C. (author), TNO Defensie en Veiligheid (author)
Orienting oneself in space is not an easy task. On Earth, we combine visual, vestibular and pressure cues into a coherent concept of up and down. Since there are no cues from gravity in space, astronauts have to adjust the way they determine up from down, with the possible risk of space motion sickness. In three tasks performed by one astronaut...
article 2006
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van Erp, J.B.F. (author), Groen, E.L. (author), Bos, J.E. (author), van Veen, H.A.H.C. (author), TNO Defensie en Veiligheid (author)
Objective: We investigated the effectiveness of a tactile torso display as a countermeasure to spatial disorientation (SD) and compared inside-out and outside-in codings. Background: SD is a serious threat to military as well as civilian pilots and aircraft. Considerable effort has been put into SD countermeasures such as training programs and...
article 2006
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Bos, J.E. (author), van Erp, J.B.F. (author), Groen, E.L. (author), van Veen, H.J. (author), TNO Defensie en Veiligheid (author)
This paper shows that tactile stimulation can override vestibular information regarding spinning sensations and eye movements. However, we conclude that the current data do not support the hypothesis that tactile stimulation controls eye movements directly. To this end, twenty-four subjects were passively disoriented by an abrupt stop after an...
article 2005
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Groen, E.L. (author), Bles, W. (author), TNO Technische Menskunde (author)
We examined to what extent body tilt may augment the perception of visually simulated linear self acceleration. Fourteen subjects judged visual motion profiles of fore-aft motion at four different frequencies between 0.04-0.33 Hz, and at three different acceleration amplitudes (0.44, 0.88 and 1.76 m/s2). Simultaneously, subjects were tilted...
article 2004
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Bakker, N.H. (author), Passenier, P.O. (author), Werkhoven, P.J. (author), TNO Technische Menskunde (author)
The type of navigation interface in a virtual environment (VE) - head slaved or indirect - determines whether or not proprioceptive feedback stimuli are present during movement. In addition, teleports can be used, which do not provide continuous movement but, rather, discontinuously displace the viewpoint over large distances. A two-part...
article 2003
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Groen, E.L. (author), de Graaf, B. (author), Bles, W. (author), Bos, J.E. (author), Kooi, F. (author), TNO Technische Menskunde (author)
In this paper we give an outline of the ground course on spatial disorientation that TNO Human Factor provides for military student aviators of the Royal Netherlands Airforce. During this one-day course a variety of laboratory equipment is used to let students experience and understand different disorienting phenomena and to make them aware of...
conference paper 2003
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Golding, J.F. (author), Bles, W. (author), Bos, J.E. (author), Haynes, T. (author), Gresty, M.A. (author), TNO Technische Menskunde (author)
Maneuvering in vehicles exposes occupants to low frequency forces (<1 Hz) which can provoke motion sickness. Hypothesis: Aligning with the tilting inertial resultant (gravity + imposed horizontal acceleration: gravito-inertial force (GIF)) may reduce motion sickness when tilting is either 'active' (self-initiated; Experiment 1) or 'passive' ...
article 2003
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Bos, J.E. (author), Bles, W. (author), Hosman, R.J.A.W. (author), Groen, E.L. (author), TNO Technische Menskunde (author)
We here present a model including visual-vestibular interactions describing the basic properties of the human spatial orientation system. It hence also explains and describes spatial disorientation. The model indicates that spatial orientation should at least be characterised by four variables: linear acceleration and velocity, angular velocity,...
conference paper 2003
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Groen, E.L. (author), Jenkin, H.L. (author), Howard, I.P. (author)
A tilted furnished room can induce strong visual reorientation illusions in stationary subjects. Supine subjects may perceive themselves upright when the room is tilted 90¦ so that the visual polarity axis is kept aligned with the subject. This -upright illusion' was used to induce roll tilt in a truly horizontal, but perceptually vertical,...
article 2002
document
TNO Technische Menskunde (author), Bos, J.E. (author), Bles, W. (author), de Graaf, B. (author)
Background: In the search for parameters to predict motion sickness that can be measured in the laboratory, we performed a longitudinal investigation in aviators. Since the vestibular system is involved in the generation of motion sickness as well as eye movements, vestibulo-ocular reflex (VOR) parameters seemed relevant. We investigated three...
article 2002
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Kappe, B. (author), van Erp, J.B.F. (author), Korteling, J.E. (author)
To improve the efficiency of images presented in low-cost vehicle simulators, the virtual viewing direction (i.e., the direction in which the image is rendered) can be head-slaved, the display can be surrounded with a less detailed peripheral image, or both. Three simulator experiments were used to evaluate the effect of these techniques on lane...
article 1999
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Bles, W. (author), TNO Technische Menskunde (author)
Coriolis effects are notorious in relation to disorientation and motion sickness in aircrew. A review is provided of experimental data on these Coriolis effects, including the modulatory effects of adding visual or somatosensory rotatory motion information. A vector analysis of the consequences of head movements during somatosensory, visual and...
article 1998
Searched for: subject%3A%22spatial%255C%2Borientation%22
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