Some interesting similarity exists between developmental systems such as those found in avian and in human vocalization. And there are some analogies between the organization of the neural systems which control the avian songs and human speech. Furthermore, the Mynah will imitate human speech (vowel, and consonants) and variety of sounds in its immediate environment when it is kept in captivity since young. Therefore, among birds the Mynah seems to be an excellent subject for experimental studies on the auditory and vocal system in human. The process of imitative learning in birds parallels the early stage of acquisition of human speech in many points. When the Mynah is breeded separately and given affluent auditory stimulus, the vocal mimicry is accelerated and its contents show much variety. This fact supports the importance of the mother's talking to the infant for the establishment of its babbling and also for the speech development. It seems that the Mynah must hear its own vocal reproductions to match its vocal motor output to its memory template. It is probable that in the Mynah, auditory feedback is necessory to develop the exact and clear vocal mimicry. In the Mynah the frequency-intensity characteristic of hearing, i. e., the audiometric curve (0.1-15.0KHz, the most sensitive frequency band: 2.0-4.0KHz), could be constructed from the conditioned response to the sound stimulus. A comparison of the avian vocalization and the audiovocalization system in man was discussed.
