Heffner R S, Heffner H E
Laboratory of Comparative Hearing, University of Kansas, Parsons.
Brain Behav Evol. 1989;33(4):248-58. doi: 10.1159/000115932.
Noise localization thresholds and the ability to localize pure tones at 60 degrees separation were determined for three domestic pigs using a conditioned avoidance procedure. The average threshold for localizing a brief noise burst was 4.5 degrees which is much more accurate than the thresholds of other hoofed mammals, such as horses, cattle and goats. The ability of pigs to localize low-frequency tones indicates that they can use the binaural phase-difference cue. However, they were unable to localize tones of 4 kHz and higher, indicating that, like other hoofed mammals, their ability to use binaural intensity cues is greatly restricted if not completely absent. An examination of the superior olivary complex of pigs revealed that in relative size, shape and cell density it is more like that of cats than that of other hoofed mammals.
采用条件性回避程序，测定了三头家猪的噪声定位阈值以及在60度间隔下定位纯音的能力。定位短暂噪声脉冲的平均阈值为4.5度，这比马、牛和山羊等其他有蹄类哺乳动物的阈值要精确得多。猪定位低频音调的能力表明它们可以利用双耳相位差线索。然而，它们无法定位4千赫及以上的音调，这表明，与其他有蹄类哺乳动物一样，它们利用双耳强度线索的能力即使不是完全没有，也受到极大限制。对猪的上橄榄复合体进行检查发现，其在相对大小、形状和细胞密度方面更类似于猫，而不是其他有蹄类哺乳动物。
