| Infant age | Characteristics of child speech level at different age | ||
| 1 у | Characteristics of infants vocalizations at 3, 6, 9, 12 months | Characteristics of babbling | The variety of vowels and consonants in the vocalizations presence at 6, 9, 12 months |
| Variety babbling (combination of different vowels and consonants) | |||
| The ratio babbling and other vocalizations (vowels and consonants; in 12 months-words) | |||
| The first words | Amount of words: KID-scope, expert perception analysis, acoustic spectrographic analysis | ||
| Infants imitation activity in 3, 6, 9, 12 months | Amount of imitation vocalizations of total vocalizations during a natural situation of “mother-child” interaction, “face to face” interaction situation, situation interaction with the mother and toys-“play” | ||
| The imitation of vowels, consonants, syllabic structure | |||
| Mothers speech (MS) | Infant vocalizations and word repetition | The amount of child vocalizations repeated her mother | |
| Acoustical characteristics of MS | Stress vowel pitch values, stress vowel duration; phrase pitch values (F0, F0 max-F0 min) | ||
| 2 y | Speech level-2 y | Words | Amount |
| Words with different syllables amount | |||
| Grammar | Single and complex phrase (amount of words) | ||
| Imitation | Sounds, syllables, words | ||
| Answer to the question of mother | Situation “book reading”-what the picture? | ||
| 3 y | Speech level-3 y | Grammar | Single and complex phrase (amount of words) |
| Repetition | The ability to repeat and retelling mother’s read text (fairy tale)-single words or logical phrase | ||
| 4 - 7 y | Speech level-4 - 7 y | Dialog with adult | Replica structure (one word, a few words, one phrase, complex phrases) |
| Reading skills | Ability to read words and the text ABC book and book reading and understanding them | ||
| Retelling of the tale or story | Logical phrase or words | ||
| Acoustical characteristics | Spontaneous speech vs. reading speech: articulation, pitch values, stress vowels duration, formant triangle area | ||
| Hearing | |||
| Dichotic listening test | The coefficient of lateral preference (CLP) | ||
| Phonematic hearing (PH) | |||
| Sensorimotor functional asymmetry | Behavioral testing | ||
| EEG | Psychological testing, EEG registration | ||