Echolocation is using lagging sounds as cues to localize the objects reflecting them. The precedence effect (PE) occurs when echoic signals are suppressed in favour of leading signals. In this study, the ability of nine listeners to overcome the PE when detecting and lateralizing echoic signals through headphones was measured and compared. Threshold estimates of the lead-lag ratio (dB) for lead-lag click-pairs at eight different inter-click intervals (ICIs) between 6-200ms were obtained. Further, two listeners trained each task at two ICIs (12 and 200ms) for seven days to investigate training, and transfer of training, effect between tasks. The results revealed that the PE is still present in lateralization tasks when ICI is at least 48ms. A threshold level difference between echo detection and lateralization was observed, indicating a possibility of different processing mechanisms between tasks. No training effects were found although longer training periods could provide more answers to what lies behind the ability to overcome the PE and echolocate efficiently in everyday life.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:su-193327 |
| Date | January 2019 |
| Creators | Isohanni (fd Kempe), Freja |
| Publisher | Stockholms universitet, Psykologiska institutionen |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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