Searched for: subject%3A%22Visual%255C%2Bsearch%22
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van der Burg, E. (author), Yu, J. (author), Hogervorst, M.A. (author), Bin, L. (author), Culpepper, J. (author), Toet, A. (author)
In order to assess camouflage and the role of movement under widely ranging (lighting, weather, background) conditions simulation techniques are highly useful. However, sufficient level of fidelity of the simulated scenes is required to draw conclusions. Here, live recordings were obtained of moving soldiers and simulations of similar scenes...
conference paper 2021
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van der Burg, E. (author), Cass, J. (author), Theeuwes, T. (author)
In this study we investigated under what conditions motion direction changes pop out in continuously moving target/distractor environments. Participants were presented with vertically oriented Gabor patches whose carrier components drifted at a constant speed from left to right and then reversed direction. On any given trial, one of these...
article 2019
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van de Weijgert, M. (author), van der Burg, E. (author), Donk, M. (author)
The aim of the present study was to investigate how display density affects attentional guidance in heterogeneous search displays. In Experiment 1 we presented observers with heterogeneous sparse and dense search displays which were adaptively changed over the course of the experiment using genetic algorithms. We generated random displays, and...
article 2019
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Kuiper, O.X. (author), Bos, J.E. (author), Diels, C. (author)
Carsickness is associated with a mismatch between actual and anticipated sensory signals. Occupants of automated vehicles, especially when using a display, are at higher risk of becoming carsick than drivers of conventional vehicles. This study aimed to evaluate the impact of positioning of in-vehicle displays, and subsequent available...
article 2018
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Kong, G. (author), Alais, D. (author), van der Burg, E. (author)
We investigated orientation categories in the guidance of attention in visual search. In the first two experiments, participants had a limited amount of time to find a target line among distractors lines. We systematically varied the orientation of the target and the angular difference between the target and distractors. We find vertical,...
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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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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Hancock, P.A. (author), Mercado, J.E. (author), Merlo, J. (author), van Erp, J.B.F. (author)
The present experiment tested 60 individuals on a multiple screen, visual target detection task. Using a within-participant design, individuals received no-cue augmentation, an augmenting tactile cue alone, an augmenting auditory cue alone or both of the latter augmentations in combination. Results showed significant and substantive improvements...
article 2013
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Toet, A. (author)
The predictions of 13 computational bottom-up saliency models and a newly introduced Multiscale Contrast Conspicuity (MCC) metric are compared with human visual conspicuity measurements. The agreement between human visual conspicuity estimates and model saliency predictions is quantified through their rank order correlation. The maximum of the...
article 2011
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Toet, A. (author)
The structural image similarity index (SSIM), introduced by Wang and Bovik (IEEE Signal Processing Letters 9-3, pp. 81-84, 2002) measures the similarity between images in terms of luminance, contrast en structure. It has successfully been deployed to model human visual perception of image distortions and modifications in a wide range of...
conference paper 2011
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Binsch, O. (author), Oudejans, R.R.D. (author), Bakker, F.C. (author), Savelsbergh, G.J.P. (author), TNO Defensie en Veiligheid (author)
Objectives Instructions to avoid an action may increase the tendency to engage in the action (ironic effects) or cause an undesirable increase in the opposing action (overcompensation). The aim of the study was to examine the relationship between gaze behavior and performance in a golf putting task when these kinds of unwanted effects occur....
article 2009
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Wilschut, E.S. (author), Rinkenauer, G. (author), Brookhuis, K.A. (author), Falkenstein, M. (author), TNO Defensie en Veiligheid (author)
conference paper 2008
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van der Burg, E. (author), Olivers, C.N.L. (author), Bronkhorst, A.W. (author), Theeuwes, J. (author), TNO Defensie en Veiligheid (author)
Searching for an object within a cluttered, continuously changing environment can be a very time-consuming process. The authors show that a simple auditory pip drastically decreases search times for a synchronized visual object that is normally very difficult to find. This effect occurs even though the pip contains no information on the location...
article 2008
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TNO Defensie en Veiligheid (author), Toet, A. (author), Groen, E.l. (author), Oosterbeek, M.T.J. (author), Hooge, I.T.C. (author)
We tested the saliency of a single vibrotractile target (T) among 2 to 7 nontargets (N), presented by 8 tactors that were equally distributed over a horizontal band around the torso. Targets and nontargets had different pulse duration, but the same activation period and no onset asynchrony. T-N similarity was varied by changing the difference...
conference paper 2008
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Martens, M.H. (author), Fox, M. (author), TNO Defensie en Veiligheid (author)
The present study shows that repeated exposure to a road environment changes eye movement behaviour. In addition, repeated exposure may result in inadequate responses to unexpected changes in the road environment. Participants drove a low-cost simulator while their eye movements were recorded. With repeated exposure participantsÂ’ glances at...
article 2007
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Martens, M.H. (author), Fox, M. (author), TNO Defensie en Veiligheid (author)
Fixation times are known to decrease after multiple exposures to the same road in simulated environments. The present study investigates whether this also holds for real driving and for watching a video, which was taped during driving (while simulating steering and braking). It appeared that the fixation times for traffic signs, information...
article 2007
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TNO Defensie en Veiligheid (author), Martens, M.H. (author)
doctoral thesis 2007
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TNO Defensie en Veiligheid (author), Hogervorst, M.A. (author), Toet, A. (author), Bijl, P. (author)
We determined the relationship between search performance with a limited field of view (FOV) and several scanning- and scene parameters in human observer experiments. The observers (38 trained army scouts) searched through a large search sector for a target (a camouflaged person) on a heath. From trial to trial the target appeared at a different...
conference paper 2005
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TNO Technische Menskunde (author), Martens, M.H. (author)
Two experiments investigated effects of expectations on eye fixations and responses to expected and unexpected information in a laboratory setting. Stimulus fixation and manual responses to predefined targets among distractors were measured in a dynamic environment shown on a monitor. Participants were part of either a predictable condition ...
article 2004
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Hogervorst, M.A. (author), Bijl, P. (author), Toet, A. (author), Miller, B. (author)
We present a new measure called target identifiability, as an efficient alternative for measuring identification scores. Identifiability is operationally defined as the amount of blur required to reduce the target signature to its identification threshold. It can quickly be determined using a simple adjustment procedure. To validate the new...
conference paper 2004
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