title: Quantification of long cane usage characteristics with the constant contact technique.
abstract: While a number of Electronic Travel Aids (ETAs) have been developed over the past decades, the conventional long cane remains the most widely utilized navigation tool for people with visual impairments. Understanding the characteristics of long cane usage is crucial for the development and acceptance of ETAs. Using optical tracking, cameras and inertial measurement units, we investigated grasp type, cane orientation and sweeping characteristics of the long cane with the constant contact technique. The mean cane tilt angle, sweeping angle, and grip rotation deviation were measured. Grasp type varied among subjects, but was maintained throughout the experiments, with thumb and index finger in contact with the cane handle over 90% of the time. We found large inter-subject differences in sweeping range and frequency, while the sweeping frequency showed low intra-subject variability. These findings give insights into long cane usage characteristics and provide critical information for the development of effective ETAs.
authors.affiliation: Rehabilitation Engineering Laboratory, ETH Zurich, Switzerland; Department of Mechatronics, MCI, Austria.
authors.forename: Yeongmi
authors.initials: Y
authors.lastname: Kim
authors.affiliation: Rehabilitation Engineering Laboratory, ETH Zurich, Switzerland.
authors.forename: Arturo
authors.initials: A
authors.lastname: Moncada-Torres
authors.affiliation: Rehabilitation Engineering Laboratory, ETH Zurich, Switzerland.
authors.forename: Jonas
authors.initials: J
authors.lastname: Furrer
authors.affiliation: Foundation Access for All, Switzerland.
authors.forename: Markus
authors.initials: M
authors.lastname: Riesch
authors.affiliation: Rehabilitation Engineering Laboratory, ETH Zurich, Switzerland. Electronic address: gassertr@ethz.ch.
authors.forename: Roger
authors.initials: R
authors.lastname: Gassert
mesh_terms: D000328:Adult; D000368:Aged; D001696:Biomechanical Phenomena; D002183:Canes; D006804:Ergonomics / Q000379:methods; D005260:Female; D005385:Fingers / Q000502:physiology; D018737:Hand Strength / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009038:Motion; D009949:Orientation; D012656:Self-Help Devices; D012682:Sensory Aids; D015354:Vision, Low / Q000534:rehabilitation*; D055815:Young Adult
keywords: Design guidelines; Electronic travel aids; Long cane usage characteristics; Visual impairment