This study investigates the use of an ultrasonic sonar device—the Sonicguide™—by blind infants. Both short-term studies, lasting up to three days, and long-term studies, lasting up to two years, are reported. The importance of the selection of strict criteria for evaluating “use” of the device is emphasized. Using such criteria, age differences in ability to make effective use of the information provided by the device were found. These findings have important implications for any future intervention programs with blind infants.
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