Sonar System of the Blind: Size Discrimination

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Science  21 May 1965:
Vol. 148, Issue 3673, pp. 1107-1108
DOI: 10.1126/science.148.3673.1107


Measurements were made of the ability of four blind subjects to use echoes to discriminate between objects of different sizes placed in front of them. Threshold estimates indicate that objects with area ratios as low as 1.07/1 could be discriminated.