The Sonic Pathfinder: An Evaluation

Abstract

This article describes an objective evaluation of a new ultrasonic mobility aid using two complementary procedures: one based on existing behavioral measures; the other, on the analysis of a user's comments. The results showed that use of the aid changes mobility in many ways: e.g., users make fewer physical contacts with the environment and stay in a more central position on the sidewalk. Although their perception of environmental sounds was reduced, this was not reflected in performance. Some users traveled quickly and smoothly with the aid, but the majority traveled more slowly and exhibited less than optimal strategies. Further modifications of the device and improved training procedures are discussed.