Hands help hearing: facilitatory audiotactile interaction at low sound-intensity levels |
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Authors: | Schürmann Martin Caetano Gina Jousmäki Veikko Hari Riitta |
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Affiliation: | Brain Research Unit, Low Temperature Laboratory, Helsinki University of Technology, FIN-02015 HUT Espoo, Finland. martins@neuro.hut.fi |
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Abstract: | Auditory and vibrotactile stimuli share similar temporal patterns. A psychophysical experiment was performed to test whether this similarity would lead into an intermodal bias in perception of sound intensity. Nine normal-hearing subjects performed a loudness-matching task of faint tones, adjusting the probe tone to sound equally loud as a reference tone. The task was performed both when the subjects were touching and when they were not touching a tube that vibrated simultaneously with the probe tone. The subjects chose on average 12% lower intensities (p < 0.01) for the probe tone when they touched the tube, suggesting facilitatory interaction between auditory and tactile senses in normal-hearing subjects. |
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