We want to understand the human capabilities to perceive amplitude similarities between a haptic and an audio signal. So, four psychophysical experiments were performed. Three of them measured the asynchrony JND (Just Noticeable Difference) at the signals' attack, release and decay, while the forth experiment measured the amplitude decrease on the middle of the signal. All the experiments used a combination of the constant stimulus and staircase methods to present two stimuli, while the participants' (N=12) task was to identify which of the two stimuli was synchronized. The audiotactile stimulus was defined using an stereo audio signal with an ADSR (Attack Decay Sustain Release) envelope. The partial results reveal JNDs for temporal asynchrony of: 54ms for attack, 265ms for decay and 57ms for release. Also the results reveal an amplitude decrease JND of 25\%. Although for decay the results were to disperse, therefore we suspect that the participants were not able to the changes on the haptic signal.

中文翻译：

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对触觉音频包络异步的敏感性

我们想了解人类感知触觉和音频信号之间幅度相似性的能力。因此，进行了四次心理物理实验。其中三个测量了信号攻击、释放和衰减时的异步 JND（Just Noticeable Difference），而第四个实验测量了信号中间的幅度下降。所有的实验都使用恒定刺激和阶梯法的组合来呈现两种刺激，而参与者（N=12）的任务是确定两种刺激中的哪一种是同步的。听觉刺激是使用带有 ADSR（攻击衰减持续释放）包络的立体声音频信号定义的。部分结果显示 JND 的时间异步性为：54ms 攻击，265ms 衰减和 57ms 释放。结果还显示幅度下降 JND 为 25\%。虽然衰减的结果是分散的，因此我们怀疑参与者无法感知触觉信号的变化。