Yan H Y, Popper A N
T.H. Morgan School of Biological Sciences, University of Kentucky, Lexington 40506.
J Comp Physiol A. 1993 Sep;173(3):347-51. doi: 10.1007/BF00212699.
The acoustic intensity discrimination ability of the oscar (Astronotus ocellatus), a cichlid fish, was investigated using an automated positive reward method. Intensity discrimination thresholds (delta I, in dB) for 7-s continuous pure tone signals were measured both as functions of sound intensity above thresholds, i.e., sensation levels, (SL)(+10 dB, +20 dB and +30 dB) and frequency (200 Hz, 500 Hz, and 800 Hz). delta I at 500 Hz for +10 dB, +20 dB, and +30 dB SLs are 8.9, 5.5, and 3.3 dB, respectively. delta I (at +20 dB SL) for 200 Hz, 500 Hz, and 800 Hz are 4.5, 5.5, and 9.3 dB, respectively. Despite having poor auditory sensitivity (narrow frequency range and high thresholds), the intensity discrimination ability of the oscar follows the general trends of previously studied fish species, however, with higher thresholds.
使用自动正向奖励方法研究了丽鱼科鱼类奥斯卡（眼斑丽鱼）的声强辨别能力。测量了7秒连续纯音信号的强度辨别阈值（δI，单位为分贝），该阈值是高于阈值的声强（即感觉水平，SL）（+10分贝、+20分贝和+30分贝）以及频率（200赫兹、500赫兹和800赫兹）的函数。对于+10分贝、+20分贝和+30分贝的感觉水平，500赫兹时的δI分别为8.9分贝、5.5分贝和3.3分贝。对于200赫兹、500赫兹和800赫兹，+20分贝感觉水平下的δI分别为4.5分贝、5.5分贝和9.3分贝。尽管奥斯卡的听觉灵敏度较差（频率范围窄且阈值高），但其强度辨别能力遵循先前研究的鱼类物种的一般趋势，不过阈值更高。
