<p>Both blind and sighted persons may use echoes for detecting objects.</p><p>The effect of object size on echolocation was tested in a listening</p><p>experiment with 15 sighted participants. Noise burst of 500-ms were</p><p>generated and recorded in an ordinary room, with and without a</p><p>reflecting object. The diameter of the reflecting object was 0.25 or</p><p>0.50 m, and it was located at a distance of 0.5, 1, 2, 3 m from the</p><p>microphones. Pairs of sounds, one with and one without the object,</p><p>were presented to the listeners. Their task was to decide which of the</p><p>two sounds that were recorded with the reflecting object. The results</p><p>showed that it was harder to detect the 0.25 than the 0.5 m object, and</p><p>that performance generally decreased with distance. The auditory</p><p>angle, which is a function of the size to distance ratio, was found to</p><p>predict detection performance fairly well.</p><p>Sighted</p>
| Identifer | oai:union.ndltd.org:UPSALLA/oai:DiVA.org:su-8108 |
| Date | January 2008 |
| Creators | Rådsten-Ekman, Maria |
| Publisher | Stockholm University, Department of Psychology |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, text |
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