Publicly displaying personal tracking data can promote healthier lifestyles, with most existing research focusing on digital visualizations. However, public physicalizations have been shown to attract more attention and foster greater engagement. Despite this, few studies in this area have utilized personal physical activity data as input or explored its impact on motivating data generators’ physical activity. To address this gap, we designed PlanetWalker, a system that visualizes users’ walking steps on their phone and shows the visualization publicly through a digital display, as well as medium- and large-scale public physicalizations as probes. The probes were deployed following the Wizard of Oz method in sequence during a six-week in-the-wild study. Through evaluations with users generating data and passersby, our findings show how public physicalizations can improve motivation, facilitate social interaction, and increase engagement. We conclude by discussing the design directions for supporting the public presentation of personal data through public physicalization to motivate physical activity and provide design trade-offs and suggestions on the physicality and scale of the medium.

Mediated social touch (MST) is a popular way to communicate emotion and connect people in mobile communication. This article applies MST gestures with vibrotactile stimuli in two online communication modes—asynchronous and synchronous communication (texting and video calling) to enhance social presence for mobile communication. We first designed the application that included the visual design of MST gestures, the vibrotactile stimuli design for MST gestures, and the interface design for texting and video calling. Then, we conducted a user study to explore if the MST gestures with vibrotactile stimuli could increase social presence in texting and video calling compared to MST gestures without vibrotactile stimuli. We also explored if the communication modes affected the social presence significantly when applying MST signals. The quantitative data analysis shows that adding vibrotactile stimuli to MST gestures helps to increase social presence in the aspects of co-presence, perceived behavior interdependence, perceived affective understanding, and perceived emotional interdependence. Adding vibrotactile stimuli to MST gestures causes no significant differences in attentional allocation and perceived message understanding. There is no significant difference between texting and video calling when applying MST signals in mobile communication. The qualitative data analysis shows that participants think MST gestures with vibrotactile stimuli are interesting, and they are willing to use them in mobile communication, but the application design should be iterated based on their feedback.

Mediated touch gestures are essential for delivering information in social networking. This study presents a method to create mediated touch gestures with vibrotactile stimuli for smart phones and explores the effectiveness of applying mediated touch gestures with vibrotactile stimuli when sending text and stickers in instant messaging applications. We developed a preliminary prototype to record vibration signals of touch gestures. The envelopes of the recorded signals are approximated by piecewise linear functions and then translated to MIDI parameters for generating vibrotactile stimuli. We applied mediated touch gestures in instant messaging applications as haptic icons. A user study showed that gesture traits and the contact time affected the sensation of haptic icons. The enhancement effect of touch gestures was influenced by the contact time.