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Werkhoven, P.J. (author), Schraagen, J.M.C. (author), Punte, P.A.J. (author), TNO Technische Menskunde (author)
The visual component of conversational media such as videoconferencing systems communicates important non-verbal information such as facial expressions, gestures, posture and gaze. Unlike the other cues, selective gaze depends critically on the configuration of cameras and monitors. Under isotropic videoconferencing conditions people see each...
article 2001
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Kurz, G. (author), Letzig, D. (author), Sillekens, W.H. (author), Werkhoven, R.J. (author), TNO Industrie en Techniek (author)
article 2009
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de Winkel, K.N. (author), Soyka, F. (author), Barnett-Cowan, M. (author), Bülthoff, H.H. (author), Groen, E.L. (author), Werkhoven, P.J. (author)
The brain is able to determine angular self-motion from visual, vestibular, and kinesthetic information. There is compelling evidence that both humans and non-human primates integrate visual and inertial (i.e., vestibular and kinesthetic) information in a statistically optimal fashion when discriminating heading direction. In the present study,...
article 2013
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Thurlings, M.E. (author), van Erp, J.B.F. (author), Brouwer, A.-M. (author), Blankertz, B. (author), Werkhoven, P.J. (author)
Event-related potential (ERP) based brain-computer interfaces (BCIs) employ differences in brain responses to attended and ignored stimuli. When using a tactile ERP-BCI for navigation, mapping is required between navigation directions on a visual display and unambiguously corresponding tactile stimuli (tactors) from a tactile control device:...
article 2012
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Ali, S. (author), Hinduja, S. (author), Atkinson, J. (author), Bolt, P.J. (author), Werkhoven, R. (author), TNO Industrie en Techniek (author)
In sheet metal forming there is an increasing demand for deep drawing of light weight components with complex shapes. However, thinner and more ductile materials are more susceptible to tearing during the process. It is known that greater draw depths can be achieved without tearing if the blankholder is subjected to a pulsating force. The...
article 2008
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van der Kleij, R. (author), Schraagen, J.M.C. (author), Werkhoven, P. (author), de Dreu, C.K.W. (author), TNO Defensie en Veiligheid (author)
An experiment was conducted to examine how communication patterns and task performance differ as a function of the group’s communication environment and how these processes change over time. In a longitudinal design, three-person groups had to select and argue the correct answer out of a set of three alternatives for ten questions. Compared with...
article 2009
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Philippi, T. (author), van Erp, J.B.F. (author), Werkhoven, P.J. (author), TNO Defensie en Veiligheid (author)
In temporal numerosity judgment, observers systematically underestimate the number of pulses. The strongest underestimations occur when stimuli are presented with a short interstimulus interval (ISI) and are stronger for vision than for audition and touch. We investigated if multisensory presentation leads to a reduction of underestimation....
article 2008
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Werkhoven, P.J. (author), van Erp, J.B.F. (author), Philippi, T. (author), TNO Defensie en Veiligheid (author)
Irrelevant events in one sensory modality can influence the number of events that are perceived in another modality. Previously, the underlying process of sensory integration was studied in conditions in which participants knew a priori which sensory modality was relevant and which was not. Consequently, (bottom-up) sensory interference and (top...
article 2009
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Thurlings, M.E. (author), van Erp, J.B.F. (author), Brouwer, A.M. (author), Werkhoven, P.J. (author)
When using brain–computer interfaces (BCIs) to control a game, the BCI may have to compete with gaming tasks for the same perceptual and cognitive resources.We investigated: 1) if and to what extent event-related potentials (ERPs) and ERP–BCI performance are affected in a dual-task situation; and 2) if these effects are an area function 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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den Bakker, A.J. (author), Werkhoven, R.J. (author), Sillekens, W.H. (author), Katgerman, L. (author)
Longitudinal weld seams are an intrinsic feature in hollow extrusions produced with porthole dies. As these joins occur along the entire extruded length, it is desirable that these weld seams have a minimal impact on the structural integrity of the extrudate. In particular, defects associated with weld seam formation should be avoided. In this...
article 2014
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Jakovenko, J. (author), Formánek, J. (author), Vladimír, J. (author), Husák, M. (author), Werkhoven, R.J. (author)
Thermal and thermo-mechanical modeling and characterization of solid state lightening (SSL) retrofit LED Lamp are presented in this paper. Paramount Importance is to design SSL lamps for reliability, in which thermal and thermo-mechanical aspects are key points. The main goal is to get a precise 3D thermal lamp model for further thermal...
article 2012
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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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Thurlings, M.E. (author), Brouwer, A.M. (author), van Erp, J.B.F. (author), Werkhoven, P.J. (author)
Gaze-independent event-related potential (ERP) based brain-computer interfaces (BCIs) yield relatively low BCI performance and traditionally employ unimodal stimuli. Bimodal ERP-BCIs may increase BCI performance due to multisensory integration or summation in the brain. An additional advantage of bimodal BCIs may be that the user can choose...
article 2014
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de Vries, S.C. (author), Werkhoven, P. (author), TNO Technische Menskunde (author)
In many laboratory setups and in many day-to-day situations, a unique solution of the structure-from-two-views problem is unobtainable. Yet, when the visual system is presented with two projections in a sequence, it nevertheless appears to generate a reasonably stable percept of structure. In the research reported here, we examined whether the...
article 1995
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Werkhoven, P.J. (author), Groen, J. (author), TNO Human Factors Research Institute (author)
We have studied manipulation performance in virtual environments using two types of controllers: virtual hand control and 3D mouse-cursor control. These manipulation methods were tested under monoscopic and stereoscopic viewing conditions. Participants were asked to discriminate, grasp, pitch, roll and position virtual objects. Both speed and...
article 1998
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Pardo, B. (author), Gasse, A. (author), Fargeix, A. (author), Jakovenko, J. (author), Werkhoven, R.J. (author), Perpiñà, X. (author), Jordà, X. (author), Vellhevi, M. (author), van Weelden, T. (author), Bancken, P. (author)
In Solid State Lighting, thermal management is a key issue. Within the C-SSL consortium, we have developed an advanced leadframe based package to reduce the thermal resistance of the component. Numerical simulations have been implemented using Ansys® software and thermal measurements have been carried out using the forward voltage method to...
article 2013
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Jansen, S.E.M. (author), Toet, A. (author), Werkhoven, P.J. (author)
In this study, the authors investigated how restriction of the vertical viewing angle influences obstacle-crossing behavior. Twelve participants stepped over obstacles of different dimensions while wearing visual-field-restricting goggles. Using full-body motion capture, several kinematic measures were extracted and analyzed. Results indicate...
article 2011
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de Winkel, K.N. (author), Weesie, J. (author), Werkhoven, P.J. (author), Groen, E.L. (author), TNO Defensie en Veiligheid (author)
In the present study, we investigated whether the perception of heading of linear self-motion can be explained by Maximum Likelihood Integration (MLI) of visual and non-visual sensory cues. MLI predicts smaller variance for multisensory judgments compared to unisensory judgments. Nine participants were exposed to visual, inertial, or visual...
article 2010
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Werkhoven, P.J. (author), TNO Defensie en Veiligheid (author)
article 2009
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