Echo-detection ability of the blind: Size and distance factors.

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Abstract
The ability of 5 blind Ss to detect metal discs placed in front of them by use of echoes was measured. S was instructed and trained to respond to the presence or absence of these targets after uttering any sound of his choice. Response thresholds were obtained for various size targets at distances ranging from 24 to 108 in. As distance increased, threshold target size increased. The mean auditory angle subtended by a target calculated to be at threshold was 4. 63[degree] with an SD of. 21[degree]. These data provide a basis for comparing performance using a vocal echo signal with performance using signal characteristics as independent variables.

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