Discrimination of speech intensity differences via vibrotactile stimulation.
This study investigated vibrotactile difference limen judgments for intensity using certain speech signals as stimuli. The variables under investigation were those of stimulus presentation level, direction of intensity increment or decrement within each paired-comparison stimulus complex, and the spectral composition of the speech signals. The results indicate that the level of stimulus presentation did not affect difference limen decisions among any of the sensation levels utilized. The largest most consistent effect upon difference limen judgments was in the direction of intensity change. The difference limen judgments were smaller when the second stimulus of the pair was of less intensity than the first. There was no effect upon difference limen decision as the result of stimuli having different spectral compositions.
D000162:Acoustics; D000328:Adult; D004193:Discrimination Learning; D005260:Female; D006801:Humans; D008297:Male; D011601:Psychophysics; D013060:Speech; D014110:Touch; D014159:Transducers; D014732:Vibration