The cognitive development of 7 normal infants during the period of their early speech development was investigated by means of the Uzgiris-Hunt Ordinal Scales. In addition, the qualitative aspects of early speech development were also studied. This research was carried out longitudinally from 8 months to 15 months of age.
The main results are as follows:
1) After acquiring the first 20 words, declarative function words increased more than demanding and emotional words.
2) The subjects acquired their first words as soon as they obtained the ability for simple object permanence, the concepts of familiar objects and the ability of verbal imitation.
3) Object permanence and Verbal Imitation in the Uzgiris-Hunt Ordinal Scales developed more rapidly in 2 subjects whose speech development were faster than the other 5 subjects.

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The 5 Japanese vowels in the speech production of Broca's aphasics were analyzed acoustically with a sound spectrograph. The first and second formant frequencies of the speech production among aphasics (3 men, 48, 51, 62 years old, 2 women, 42, 49 years old) and the normals (3 men, 32, 57, 62 years old, 2 women, 32, 46 years old) were compared.
The results are as follows. The variation of the first and second formant frequencies of each case was bigger than that of normals. Especially, in case 5 the relatively acute stage, the variation of the first and second formant frequencies was the most prominent. This phenomenon corresponded with the auditory perception of the distorted sound.
A further sequential experiment on case 5 revealed the decrease of the variation of the first and second formant frequencies. In conclusion, the degrees of the variation of the formant frequencies were different among patients. It was also suggested that the motor programing disorders are found in the articulation of vowels in these cases.

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