(1 - 20 of 27)

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Brouwer, A.M. (author), van der Waa, J.S. (author), Hogervorst, M.A. (author), Cacace, A. (author), Stokking, H. (author)
While brain signals potentially provide us with valuable information about a user, it is not straightforward to derive and use this information to smooth man-machine interaction in a real life setting. We here propose to predict head rotation on the basis of brain signals in order to improve images presented in a Head Mounted Display (HMD)....
conference paper 2017
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Brouwer, A.M. (author), Hogervorst, M.A. (author), Grootjen, M. (author), van Erp, J.B.F. (author), Zandstra, E.H. (author)
Neurophysiological correlates of affective experience could potentially provide continuous information about a person’s experience when cooking and tasting food, without explicitly verbalizing this. Such measures would be helpful to understand people’s implicit food preferences and choices. This study examined for the first time the relation...
article 2017
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Brouwer, A.M. (author), Hogervorst, M.A. (author), Oudejans, B.A. (author), Ries, A.J. (author), Touryan, J. (author)
EEG and eye tracking variables are potential sources of information about the underlying processes of target detection and storage during visual search. Fixation duration, pupil size and event related potentials (ERPs) locked to the onset of fixation or saccade (saccade-related potentials, SRPs) have been reported to differ dependent on whether...
article 2017
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van Erp, J.B.F. (author), Hogervorst, M.A. (author), van der Werf, Y.D. (author)
Ebooks of the future may respond to the emotional experience of the reader. (Neuro-) physiological measures could capture a reader's emotional state and use this to enhance the reading experience by adding matching sounds or to change the storyline therewith creating a hybrid art form in between literature and gaming. We describe the theoretical...
article 2016
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Toet, A. (author), Hogervorst, M.A. (author)
We introduce a multiscale image fusion scheme based on guided filtering. Guided filtering can effectively reduce noise while preserving detail boundaries. When applied in an iterative mode, guided filtering selectively eliminates small scale details while restoring larger scale edges. The proposed multi-scale image fusion scheme achieves optimal...
conference paper 2016
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Hogervorst, M.A. (author), Toet, A. (author)
Previously, we presented a method for applying daytime colours to fused nighttime (e.g., intensified and LWIR) imagery (Toet and Hogervorst, Opt.Eng. 51(1), 2012). Our colour mapping not only imparts a natural daylight appearance to multiband nighttime images but also enhances the contrast and visibility of otherwise obscured details. As a...
conference paper 2016
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Brouwer, A.M. (author), Hogervorst, M.A. (author), Reuderink, B. (author), van der Werf, Y. (author), van der Erp, J.B.F. (author)
We are interested in monitoring an individual’s emotions during the reading of a novel. While physiological responses to experimentally induced emotions are often small and inconsistent, being engaged in a novel may elicit relatively strong responses. We analyzed EEG, ECG, skin conductance and respiration of 57 readers reading a complete, yet to...
article 2015
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Hogervorst, M.A. (author), Kooi, F.L. (author)
Current night-time training using (flight-, driving-) simulators is hindered by the lack of realism. Effective night-time training requires the simulation of the illusions and limitations experienced while wearing Night Vision Goggles during the night. Various methods exist that capture certain sensor effects such as noise and the characteristic...
conference paper 2014
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Bijl, P. (author), Kooi, F.L. (author), Hogervorst, M.A. (author)
End-to-end Electro-Optical system performance tests such as TOD, MRTD and MTDP require the effort of several trained human observers, each performing a series of visual judgments on the displayed output of the system. This significantly contributes to the costs of sensor testing. Currently, several synthetic human observer models exist that can...
conference paper 2014
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Brouwer, A.M. (author), Hogervorst, M.A. (author), Holewijn, M. (author), van Erp, J.B.F. (author)
Learning to master a task is expected to be accompanied by a decrease in effort during task execution. We examine the possibility to monitor learning using physiological measures that have been reported to reflect effort or workload. Thirty-five participants performed different difficulty levels of the n-back task while a range of physiological...
article 2014
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Toet, A. (author), de Jong, M.J. (author), Hogervorst, M.A. (author), Hooge, I.T.C. (author)
We recently presented a color transform that produces fused nighttime imagery with a realistic color appearance (Hogervorst & Toet, 2010, Information Fusion, 11-2, 69-77). To assess the practical value of this transform we performed two experiments in which we compared human scene recognition for monochrome intensified (II) and longwave infrared...
conference paper 2014
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Brouwer, A.M. (author), Brinkhuis, M.A.B. (author), Reuderink, B. (author), Hogervorst, M.A. (author), van Erp, J.B.F. (author)
The P300 event-related potential (ERP) can be used to infer whether an observer is looking at a target or not. Common practice in P300 BCIs and experiments is that observers are asked to fixate their eyes while stimuli are presented. First studies have shown that it is also possible to distinguish between target and non-target fixations on the...
conference paper 2014
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Hogervorst, M.A. (author), Brouwer, A.M. (author), van Erp, J.B.F. (author)
While studies exist that compare different physiological variables with respect to their association with mental workload, it is still largely unclear which variables supply the best information about momentary workload of an individual and what is the benefit of combining them. We investigated workload using the n-back task, controlling for...
article 2014
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Toet, A. (author), de Jong, M.J. (author), Hogervorst, M.A. (author), Hooge, I.T.C. (author)
Color remapping can give multispectral imagery a realistic appearance. We assessed the practical value of this technique in two observer experiments using monochrome intensified (II) and long-wave infrared (IR) imagery, and color daylight (REF) and fused multispectral (CF) imagery. First, we investigated the amount of detail observers perceive...
article 2014
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Brouwer, A.M. (author), Hogervorst, M.A. (author)
We here introduce a new experimental paradigm to induce mental stress in a quick and easy way while adhering to ethical standards and controlling for potential confounds resulting from sensory input and body movements. In our Sing-a-Song Stress Test, participants are presented with neutral messages on a screen, interleaved with 1-min time...
article 2014
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Alferdinck, J.W.A.M. (author), Kroon, E.C.M. (author), Hogervorst, M.A. (author), van der Horst, A.R.A. (author)
report 2013
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Gosselink, G.A.B. (author), Anbeek, H. (author), Bijl, P. (author), Hogervorst, M.A. (author)
The Triangle Orientation Discrimination (TOD) test method was applied to characterize thermal and visual range performance of the Gatekeeper Electro Optical Security System. Gatekeeper developed by Thales Nederland BV, is currently in use with the Royal Netherlands Navy. The system houses uncooled infrared and colour TV cameras providing up to...
conference paper 2013
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Alferdinck, J.W.A.M. (author), Hogervorst, M.A. (author)
Light sources that are optimized for mesopic vision contain a relatively high amount of bluish light (high S/P-ratio) and are therefore effective for peripheral visual tasks at mesopic light levels. Since the spectra of these light sources differ strongly from the common public lighting there were doubts on the performance of these light sources...
conference paper 2013
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Alferdinck, J.W.A.M. (author), Hogervorst, M.A. (author)
Purpose : According to international legislation pilothouse windows of inland vessels should have a minimum light transmission of 75%. The shipping sector is wondering whether this requirement can be reduced since a large portion of the fleet is equipped with green tinted windows panes with a lower light transmission. In this study, we answer...
report 2013
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Hogervorst, M.A. (author), Toet, A. (author), Bijl, P. (author)
We investigate how human visual search performance with field of view (FOV) restrictions depends on scan speed, zoom factor, target location, and conspicuity. First, observers search a FOV that moves at a constant speed along a predefined path over a visual search scene (the field of regard, or FOR), and we measure the effects of scan speed,...
article 2013
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