Searched for: subject:"Perception"
(1 - 10 of 10)
document
Wertheim, A.H. (author), Kemper, H.C.G. (author), Heus, R. (author)
In previous studies on physical fatigue during simulated ship movements, the apparent exhaustion of subjects after experimentation suggested that the traditional index of physical workload, oxygen consumption expressed as the percentage of peak oxygen consumption (VO2-peak) measured in a separate graded exercise test (GXT), underestimates...
article 2002
document
Wertheim, A.H. (author), TNO Technische Menskunde (author)
Various annoyingly incorrect statements of Stoffregen & Bardy are corrected, for example, that perception researchers commonly use the term "absolute motion" to denote motion without any frame of reference, confuse earth-relative and gravity-relative motion, err with respect to the frame of reference implied by their subject is motion responses,...
article 2001
document
TNO Technische Menskunde (author), Wertheim, A.H. (author), Mesland, B.S. (author), Bles, W. (author)
On the basis of models of otolith functioning, one would expect that, during sinusoidal linear self-motion in darkness, percepts of body tilt are experienced. However, this is normally not the case, which suggests that the otoliths are not responsive to small deviations from the vertical of the gravito-inertial force vector acting on them. Here...
article 2001
document
Bles, W. (author), Bos, J.E. (author), de Graaf, J.E. (author), Groen, E.L. (author), Wertheim, A.H. (author), TNO Technische Menskunde (author)
In reviewing the various forms of motion sickness the classical sensory rearrangement theory has been redefined by demonstrating that only one type of conflict is necessary and sufficient to explain all different kinds of motion sickness. A mathematical description is provided from the summarizing statement that "All situations which provoke...
article 1998
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Wertheim, A.H. (author), Bos, J.E. (author), Bles, W. (author), TNO Technische Menskunde (author)
The purpose of the present study was to test the traditional assumption that sea sickness is uniquely provoked by heave motion characteristics, pitch and roll movements being ineffective. In an experi-ment with a ship motion simulator subjects were exposed to pitch, and roll motions in combination with rather weak heave motions that have no...
article 1998
document
Wertheim, A.H. (author), TNO Human Factors Research Institute (author)
The present paper provides a review of research and theories concerning the question of how and why working in a moving environment may affect performance. It is argued that performance decrements can be expected to occur as a result of general factors or as a result specific impairments of particular human skills. General effects happen when...
article 1998
document
Mesland, B.S. (author), Wertheim, A.H. (author), TNO Technische Menskunde (author)
A visual illusion is reported which comprises the following: when a monitor with a moving constant velocity grating is swayed in front of a subject, the grating may be perceived as freezing or decelerating on the screen. This percept appears to depend on the magnitude and direction of the retinal grating velocity, relative to that of the moni...
article 1996
document
Bos, J.E. (author), de Graaf, B. (author), Bles, W. (author), Wertheim, A.H. (author), TNO Technische Menskunde (author)
article 1996
document
Wertheim, A.H. (author), TNO Technische Menskunde (author)
This is a popularly written expose of what the profession of experimental psychol-ogy comprises. It is based on personal experience and is intended for a general readership of PhD students.
article 1995
document
Wertheim, A.H. (author), van Gelder, P. (author)
When the eyes pursue a fixation point that sweeps across a moving background pattern, and the fixation point is suddenly made to stop, the ongoing motion of the background pattern seems to accelerate to a higher velocity. Experiment I showed that this acceleration illusion is not caused by the sudden change in (i) the relative velocity between...
article 1990
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