Vi-Bowling: A Tactile Spatial Exergame for Individuals with Visual Impairments
Tony Morelli, John Foley, Eelke Folmer · 2010 · Proceedings of the 12th International ACM SIGACCESS Conference on Computers and Accessibility (ASSETS 2010) · doi:10.1145/1878803.1878836
Summary
This paper presents VI Bowling, an accessible exergame (exercise video game) for blind and visually impaired players that introduces tactile dowsing — a novel interaction technique using vibrotactile feedback from a Nintendo Wii remote to perform spatial aiming challenges without vision. The game reimplements Wii Sports Bowling with a sensory substitution approach: where the original game uses visual cues as primary feedback and tactile/audio as secondary, VI Bowling inverts this, making tactile feedback primary and audio secondary. Players aim their bowling ball by moving the Wii remote horizontally until vibrotactile pulses become continuous, indicating they are pointing at the target direction (determined via an infrared sensor bar). The pulse delay decreases linearly from 2500ms at maximum error to 125ms per degree of error, creating a "warmer/colder" haptic signal. Players then perform a bowling throw motion to release the ball. The direction of the throw is determined by the controller's orientation at the moment of release, combining the spatial aiming challenge with the temporal throwing challenge into a single motor action. The game was built as an open-source PC application using the Wii remote's built-in accelerometer, infrared sensor, and vibrotactile motor — an inexpensive, commercially available controller.
Key findings
A user study with six blind adults (ages 30-71, four totally blind and two legally blind) found that all participants enjoyed the game and the tactile dowsing challenge. Players achieved an average aiming error of 9.76 degrees using tactile dowsing, with accuracy increasing significantly over ten frames (F(4.5) = 0.002, p < 0.05). Average active energy expenditure was 4.61 kJ/min, which is comparable to walking and classifies as light-to-moderate physical activity (MVPA). However, this was lower than standard Wii Bowling (11.7 kJ/min), primarily because tactile dowsing added time to the aiming phase — average dowsing time was 7.84 seconds per frame, though this decreased over the session. All participants were able to familiarise themselves with the controller and learn to play using a brief five-minute tutorial. Qualitative feedback showed participants liked the challenge (M=4.5 on 5-point scale) and felt the game could help with exercise (M=4.5). Participants suggested improvements including spatial audio to indicate pin locations, audible environmental sounds (e.g., a cheering crowd), and a multiplayer option. The tactile dowsing technique has potential applications beyond gaming, including indoor navigation and other physical activities with spatial aiming components such as baseball.
Relevance
This paper makes an important contribution to accessible game design by demonstrating that spatial challenges — traditionally considered impossible without vision — can be made accessible through haptic feedback. The tactile dowsing technique is a creative example of sensory substitution that transforms a visual-spatial task into a tactile one without simplifying the underlying challenge. For accessibility practitioners, the key insight is that making games accessible does not require removing gameplay complexity; instead, the same challenge can be presented through a different sensory channel. The research also addresses a serious health equity issue: people with visual impairments face significant barriers to physical activity, contributing to higher rates of obesity and related conditions. Exergames that can be played independently at home offer a practical intervention. The use of inexpensive, off-the-shelf hardware (Wii remote) rather than specialised equipment is a design choice that increases the practical reach of the solution.
Tags: exergame · visual impairment · haptic technology · game accessibility · physical activity · sensory substitution · motor learning · blindness · Wii remote · tactile feedback