Publikationen

A Comparison of Mental and Physical Rotation Using Gaze-Based Measures

Wetzel, S., & Bertel, S. (2018). A Comparison of Mental and Physical Rotation Using Gaze-Based Measures. Spatial Cognition XI. Tübingen. Germany: Springer International Publishing.

Abstract

Over the past few years, a number of studies have reported on procedural similarities and differences between mental rotation and physical (i.e., manual) rotation of Shepard and Metzler-type stimuli. These similarities include comparable angular disparity effects and comparable final angular offsets in problem solving. This paper presents results from further comparisons based on gazed-derived measures obtained across the course of trials. In a within-subject design, participants solved the same tasks as mental and as physical rotation problems. We compare time courses of mean fixation duration and of saccade amplitude, and interpret these with respect to underlying mental processes and loads. The results point to additional specific procedural similarities and differences, which nicely complement the previous findings. The results are of additional, practical use for establishing how and when physical rotation can provide a useful proxy for mental rotation for purposes of process analysis, of ability assessment, and of training.
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  Bertel, Sven
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Information Push and Pull in Tactile Pedestrian Navigation Support

von Jan, V., Bertel, S., & Hornecker, E. (2018). Information Push and Pull in Tactile Pedestrian Navigation Support. In Proceedings of the 20th International Conference on Human-Computer Interaction with Mobile Devices and Services Adjunct (S. 55–62). New York, NY, USA: Association for Computing Machinery. http://doi.org/10.1145/3236112.3236120

Abstract

For pedestrian navigation support, we report on how the feeling of being in control about receiving updates impacts navigation efficiency and user experience. In an exploratory field study, 24 participants navigated to previously unknown targets using a wristband which conveyed tactile information about targets bearing. Information was either pulled by the user at times of her choosing via a simple arm gesture, or was pushed by the armband at a regular, preset interval. While the push mode resulted in higher efficiency, more users preferred actively pulling information, possibly as this afforded feeling more in control. Interestingly, mode preference was independent of individual navigation ability. Results suggest that properties of the specific navigation context should be used to determine whether an interface offers push or pull modes for navigation support.
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A gender issue? - Process measures while solving spatial tasks on mobile devices

Zander, S., Yepes-Serna, V., Montag, M., Wetzel, S., & Bertel, S. (2018). A gender issue? - Process measures while solving spatial tasks on mobile devices. EARLI SIG 27 Meeting (Online Measures of Education). Warszaw, Poland.
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  Bertel, Sven
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A gender issue? - Analyzing individual differences while solving spatial tasks on mobile devices

Zander, S., Yepes-Serna, V., Montag, M., Wetzel, S., & Bertel, S. (2018). A gender issue? - Analyzing individual differences while solving spatial tasks on mobile devices. EARLI SIG 6 & 7 Meeting (Technology-Enhanced Learning). Bonn, Germany.
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  Bertel, Sven
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The Powerbar - Effects of a ressource-restricting tool while solving spatial tasks on mobile devices

Montag, M., Bertel, S., de Koning, B. B., & Zander, S. (2018). The Powerbar - Effects of a ressource-restricting tool while solving spatial tasks on mobile devices. EARLI SIG 6 & 7 Meeting (Technology-Enhanced Learning). Bonn, Germany.
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  Bertel, Sven
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Assessing objective image quality metrics for bidirectional texture functions

Azari, B., Bertel, S., & Wüthrich, C. A. (2018). Assessing objective image quality metrics for bidirectional texture functions. 25th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision (WSCG 2018). Pilsen, Czech Republic.
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"Not Another Z Piece!": Adaptive Difficulty in TETRIS

Spiel, K., Bertel, S., & Kayali, F. (2017). "Not Another Z Piece!": Adaptive Difficulty in TETRIS. In Proceedings of the 2017 CHI Conference on Human Factors in Computing Systems (S. 5126–5131). New York, NY, USA: Association for Computing Machinery. Abgerufen von https://doi.org/10.1145/3025453.3025721

Abstract

Difficulty in TETRIS is adjusted by adapting the speed with which blocks fall. In this contribution, we describe results of an exploratory study in which we investigated relationships between players performance and their subjective assessment of difficulty and fun. We tested five different algorithms that, instead of adjusting game speed, adjust difficulty by choosing blocks based on the current game state. With our results, we establish pile height and bumpiness as parameters that indicate the performance of a player during a live game, discuss the inherent difficulty of different block choosing algorithms and show how the relationship between fun and perceived difficulty varies for distinct player groups. With regard to adapting difficulty, we argue that one can still teach an old dog such a TETRIS a lot of new tricks.
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"Physical Touch-Based Rotation Processes of Primary School Students"

Bertel, S., Wetzel, S., & Zander, S. (2017). "Physical Touch-Based Rotation Processes of Primary School Students". In Spatial Cognition X (S. 19–37). Philadelphia, PA, USA: Springer International Publishing.

Abstract

We present a novel method for deriving solution strategies used when solving rotation tasks. Process-based findings about physical rotation are obtained from an analysis of how angular disparity between stimuli changes over time. Data on angular disparity was gathered through a study on mental and physical rotation with 37 primary school students between the ages of 8 and 11. For controlling physical rotation, students used touch-based input on our iOS app Rotate it!, which also logged their interactions. Data on changes of angular disparity was used in the construction of Markov models. The models were employed to generate sets of synthetic angular disparity time courses, based on which we identified three distinct rotation-based solution strategies. Our analysis has implications for understanding processes involved in physical and mental rotation alike. It helps to lay grounds on which novel interactive diagnostic and training tools for spatial skills can be developed.
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Strategies Used by Primary School Students During Physical Touch-Based Rotation

Wetzel, S., Zander, S., & Bertel, S. (2017). Strategies Used by Primary School Students During Physical Touch-Based Rotation. 17th Biennial Conference EARLI 2017. Tampere, Finland.
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Low Cost Rapid Acquisition of Bidirectional Texture Functions for Fabrics

Azari, B., Wüthrich, C. A., & Bertel, S. (2017). Low Cost Rapid Acquisition of Bidirectional Texture Functions for Fabrics. In 25th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision (WSCG 2017). Plzen, Czech Republic.

Abstract

Creating photo realistic images from real word complex materials is a great challenge: the reflectance function of materials, especially fabrics, has glossy or specular highlights, reflectance anisotropy and retroreflections. This increases greatly the complexity of rendering. Bidirectional Texture Functions (BTFs), i.e. 2D textures acquired under varying illumination and viewing directions, have been used to render complex materials. However, the acquisition of textures for BTF requires up to now expensive setups and the measurement process is very timeconsuming as the directional dependent parameters (lighting and viewing directions) have to be controlled accurately. This paper will present in detail a new low cost programmable device for the rapid acquisition of BTF datasets. The device allows to acquire BTF databases at a fraction of the cost of available setups, and allows to experiment when a texture resolution and sample density increase in the parameter space is not perceivable by an observer of the renderings. The paper proves that using smaller resolution textures and decreasing the samples in parameter space does not lead to a loss of picture quality.
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