Roberto M, Hamernik R P, Salvi R J, Henderson D, Milone R
J Acoust Soc Am. 1985 Apr;77(4):1514-20. doi: 10.1121/1.391993.
The equal energy hypothesis (EEH) was evaluated over a limited range of conditions by exposing four groups of chinchillas to impact noise (200-ms B duration) presented at a fixed rate of four impacts per second. The intensity of the impacts (107-125 dB peak SPL) and the duration (120-1.87 h) of the four exposure conditions were counterbalanced so that the four groups received the same total energy. The traumatic power of the exposures was assessed by measuring the threshold shift of the auditory evoked response and the amount of hair cell loss. Exposure between 107 and 119 dB were consistent with the EEH in that they produced roughly the same amount of permanent threshold shift (less than 20 dB) and hair cell loss (less than 20%). However, the 125-dB exposure produced substantially more threshold shift and hair cell loss than the three lower intensities. Thus, the EEH may be applicable only at lower impact intensities; above a "critical intensity" the amount of damage increases significantly.
通过让四组龙猫暴露于以每秒四次撞击的固定速率呈现的冲击噪声（200毫秒B持续时间），在有限的条件范围内对能量相等假说（EEH）进行了评估。对四种暴露条件下撞击的强度（峰值声压级107 - 125分贝）和持续时间（120 - 1.87小时）进行了平衡处理，以便四组接受相同的总能量。通过测量听觉诱发反应的阈值变化和毛细胞损失量来评估暴露的致伤能力。107至119分贝的暴露与能量相等假说一致，因为它们产生的永久性阈值变化（小于20分贝）和毛细胞损失量（小于20%）大致相同。然而，125分贝的暴露比三种较低强度的暴露产生了明显更多的阈值变化和毛细胞损失。因此，能量相等假说可能仅适用于较低的撞击强度；超过“临界强度”，损伤量会显著增加。
