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Auflistung nach Autor:in "Wittchen, Dennis"

1 - 4 von 4
  • Konferenzbeitrag
    Exploring Dynamic Vibrotactile Feedback for Layer-based Interaction on Elastic Displays
    (Mensch und Computer 2023 - Tagungsband, 2023) Müller, Mathias; Ramian, Alexander; Wittchen, Dennis; Freitag, Georg; Kammer, Dietrich
    Elastic Displays are shape-changing interfaces, typically made from elastic fabric. Surface deformation creates an additional dimension of interaction and enhances the haptic experience for the user compared to rigid touch interfaces. Other forms of shape-changing interfaces such as actuated displays introduce significant mechanical complexity with the benefit of providing active haptic feedback and self-deformation. We investigate ways to make Elastic Displays more ‘active’ while maintaining their simple setup. Our approach adds vibrotactile feedback to the elastic surface, which add explicit haptic feedback when pushing and pulling the surface. In this contribution, we describe the technical setup and introduce concepts for exploring this active haptic feedback. We realized a case study, in which a layered information space is explored. Finally, we report lessons learned from user feedback, showing that solely vibrotactile feedback may have distracting effects on the user, but in combination with visual feedback can improve the user experience.
  • Workshopbeitrag
    A head-based vibrotactile compass for cyclists
    (Mensch und Computer 2021 - Workshopband, 2021) Krauß, Anna-Magdalena; Wittchen, Dennis; Kammer, Dietrich; Freitag, Georg
    Cycling stimulates the human mind and body in manifold ways. However, even on a leisure ride, certain waypoints or destinations must be reached. Therefore, orientation is a crucial task for every cyclist. Vibrotactile systems for cyclists do not clog up the visual and auditory senses needed to experience the immediate environment. However, our literature survey shows that previous work focuses on turn-by-turn navigation systems and does not leverage the potential of vibrotactile feedback on the head. Since the head is not in direct contact with the bike, we argue that vibrations occurring naturally are less confounding. Moreover, head movements are already crucial for wayfinding. We present an unobtrusive orientation system for cyclists with head-based vibrotactile feedback – a vibrotactile compass. In a user study, we show the feasibility of our system.
  • Konferenzbeitrag
    Investigating Apparent Tactile Motion and Cutaneous Rabbit Illusion to Support Cyclists' Navigation
    (Mensch und Computer 2023 - Tagungsband, 2023) Wittchen, Dennis; Schreyer, Gabriel; Ramian, Alexander; Freitag, Georg
    The objective of this work is to uncover the capabilities of tactile illusions applied on the head to assist cyclists in navigation tasks. Recent research using tactile illusions to support guidance has focused on augmenting the entire circumference of the head. A comparison of apparent tactile motion (ATM) and cutaneous rabbit illusion (CRI) in this context has not yet been performed. We developed a headband that renders such illusions exclusively on the forehead to indicate 360°-directional information. In a feasibility study with 17 participants, we evaluated the performance of eight directional cues rendered as ATM and CRI while riding a bike simulator. Our results show that participants recognize directional cues of both illusions equally (ATM: M=70.6%, SD=21.1; CRI: M=67.2%, SD=22.8), which gives more flexibility in the design of vibrotactile patterns. Even though the overall recognition rates might not meet the threshold needed for sufficient navigation in real scenarios yet, these findings suggest that tactile illusions can be beneficial in everyday activities such as navigation for cyclists.
  • Workshopbeitrag
    NAVIGONS - Analyzing tactons for navigation
    (Mensch und Computer 2020 - Workshopband, 2020) Krauß, Anna-Magdalena; Ramian, Alexander; Ballin, Philipp; Wittchen, Dennis; Freitag, Georg
    Vibro-tactile navigation systems use the sense of touch across numerous application contexts and motivations. The vibrotactile patterns (tactons) deployed to transmit the information are often tailored to the scenario and the respective hardware. Without an appropriate classification system, it is difficult to compare tactons with each other or to identify their potential for new use cases. Therefore, we apply the previously developed taxonomy VibTacX to a set of tactons used for navigation tasks – NAVIGONS. Following, we present and discuss the identified characteristics of the use cases. Furthermore, the application of VibTacX acts as a filter system to identify and investigate similarities and differences independent of the use cases. This procedure may be the basis for the structured development of tactons. Hence, we conclude with an outlook on future design guidelines for vibro-tactile user interfaces and the qualitative improvement of tactons.