Ranjbar Parivash, Wilson E Courtenay, Reed Charlotte M, Braida Louis D
Audiological Research Centre, University Hospital at Örebro, Sweden.
Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139 USA.
Int J Eng Technol Sci Innov. 2016 Apr;1(2):209-229.
The perceptual integration of 50- and 250-Hz, 500-ms vibrotactile and auditory tones was studied in detection experiments as a function of the relative phase (0°, 72°, 144°, 216°, and 288°) of the tone pulses. Vibrotactile stimuli were delivered through a single-channel vibrator to the left middle fingertip and auditory stimuli were presented diotically through headphones in a background of 50 dB SPL broadband noise. The observers were four adults with normal hearing. The vibrotactile and auditory stimulus levels used each yielded 63-77%-Correct unimodal detection performance in a two-interval two-alternative forced-choice task. Scores for the auditory-alone and tactile-alone conditions averaged roughly 70%-Correct. Mean scores for the auditory plus tactile conditions averaged across different phases were 77.1%-Correct at 50 Hz and 79.6%-Correct at 250 Hz. At 50 Hz, no differences in performance were observed as a function of the relative phase at which the combined auditory and tactile signals were presented. At 250 Hz, significantly higher scores were observed for one phase combination (72°) compared to two of the other four relative phases. Performance on the auditory plus tactile conditions resulted in significant integrative effects and was generally more consistent with a "Pythagorean Sum" model than with either an "Algebraic Sum" or an "Optimum Single Cannel" model of perceptual integration.
在检测实验中，研究了50赫兹和250赫兹、500毫秒的振动触觉和听觉音调的感知整合，该整合是音调脉冲相对相位（0°、72°、144°、216°和288°）的函数。振动触觉刺激通过单通道振动器传递到左手无名指指尖，听觉刺激通过耳机以双耳方式呈现，背景为50分贝声压级的宽带噪声。观察者为四名听力正常的成年人。在双间隔二选一强制选择任务中，所使用的振动触觉和听觉刺激水平各自产生了63%-77%正确的单峰检测性能。单独听觉和单独触觉条件下的得分平均约为70%正确。不同相位下听觉加触觉条件的平均得分在50赫兹时为77.1%正确，在250赫兹时为79.6%正确。在50赫兹时，未观察到作为组合听觉和触觉信号呈现相对相位函数的性能差异。在250赫兹时，与其他四个相对相位中的两个相比，观察到一个相位组合（72°）的得分显著更高。听觉加触觉条件下的表现产生了显著的整合效应，并且总体上与“毕达哥拉斯和”模型比与“代数和”或“最佳单通道”感知整合模型更一致。
