Speech repetition
Speech repetition occurs when individuals speak the sounds that they have heard another person pronounce or say. In other words, it is the saying by one individual of the spoken vocalizations made by another individual. Speech repetition requires the person repeating the utterance to have the ability to map the sounds that they hear from the other person's oral pronunciation to similar places and manners of articulation in their own vocal tract.
Such speech imitation often occurs independently of speech comprehension such as in speech shadowing in which people automatically say words heard in earphones, and the pathological condition of echolalia in which people reflexively repeat overheard words. That links to speech repetition of words being separate in the brain to speech perception. Speech repetition occurs in the dorsal speech processing stream, and speech perception occurs in the ventral speech processing stream. Repetitions are often incorporated unawares by that route into spontaneous novel sentences immediately or after delay after the storage in phonological memory.
In humans, the ability to map heard input vocalizations into motor output is highly developed because of the copying ability playing a critical role in children's rapid expansion of their spoken vocabulary. In older children and adults, that ability remains important, as it enables the continued learning of novel words and names and additional languages. That repetition is also necessary for the propagation of language from generation to generation. It has also been suggested that the phonetic units out of which speech is made have been selected upon by the process of vocabulary expansion and vocabulary transmissions because children prefer to copy words in terms of more easily imitated elementary units.Properties
Automatic
Vocal imitation happens quickly: words can be repeated within 250-300 milliseconds both in normals and during echolalia. The imitation of speech syllables possibly happens even more quickly: people begin imitating the second phone in the syllable earlier than they can identify it. Indeed, "...simply executing a shift to upon detection of a second vowel in takes very little longer than does interpreting and executing it as a shadowed response". Neurobiologically this suggests "...that the early phases of speech analysis yield information which is directly convertible to information required for speech production". Vocal repetition can be done immediately as in speech shadowing and echolalia. It can also be done after the pattern of pronunciation is stored in short-term memory or long-term memory. It automatically uses both auditory and where available visual information about how a word is produced.
The automatic nature of speech repetition was noted by Carl Wernicke, the late nineteenth century neurologist, who observed that "The primary speech movements, enacted before the development of consciousness, are reflexive and mimicking in nature..".Independent of speech
Vocal imitation arises in development before speech comprehension and also babbling: 18-week-old infants spontaneously copy vocal expressions provided the accompanying voice matches. Imitation of vowels has been found as young as 12 weeks. It is independent of native language, language skills, word comprehension and a speaker's intelligence. Many autistic and some mentally disabled people engage in the echolalia of overheard words without understanding what they echo. Reflex uncontrolled echoing of others words and sentences occurs in roughly half of those with Gilles de la Tourette syndrome. The ability to repeat words without comprehension also occurs in mixed transcortical aphasia where it links to the sparing of the short-term phonological store.
The ability to repeat and imitate speech sounds occurs separately to that of normal speech. Speech shadowing provides evidence of a 'privileged' input/output speech loop that is distinct to the other components of the speech system. Neurocognitive research likewise finds evidence of a direct link between phonological analysis input and motor programming output.Effector independent
Speech sounds can be imitatively mapped into vocal articulations in spite of vocal tract anatomy differences in size and shape due to gender, age and individual anatomical variability. Such variability is extensive making input output mapping of speech more complex than a simple mapping of vocal track movements. The shape of the mouth varies widely: dentists recognize three basic shapes of palate: trapezoid, ovoid, and triangular; six types of malocclusion between the two jaws; nine ways teeth relate to the dental arch and a wide range of maxillary and mandible deformities. Vocal sound can also vary due to dental injury and dental caries. Other factors that do not impede the sensory motor mapping needed for vocal imitation are gross oral deformations such as hare-lips, cleft palates or amputations of the tongue tip, pipe smoking, pencil biting and teeth clinching. Paranasal sinuses vary between individuals 20-fold in volume, and differ in the presence and the degree of their asymmetry.Diverse linguistic vocalizations
Vocal imitation occurs potentially in regard to a diverse range of phonetic units and types of vocalization. The world's languages use consonantal phones that differ in thirteen imitable vocal tract place of articulations. These phones can potentially be pronounced with eleven types of imitable manner of articulations. Speech can be copied in regard to its social accent, intonation, pitch and individuality. Speech can be articulated in ways which diverge considerably in speed, timbre, pitch, loudness and emotion. Speech further exists in different forms such as song, verse, scream and whisper. Intelligible speech can be produced with pragmatic intonation and in regional dialects and foreign accents. These aspects are readily copied: people asked to repeat speech-like words imitate not only phones but also accurately other pronunciation aspects such as fundamental frequency, schwa-syllable expression, voice spectra and lip kinematics, voice onset times, and regional accent.Language acquisition
Vocabulary expansion
In 1874 Carl Wernicke proposed that the ability to imitate speech plays a key role in language acquisition. This is now a widely researched issue in child development. A study of 17,000 one and two word utterances made by six children between 18 months to 25 months found that, depending upon the particular infant, between 5% and 45% of their words might be mimicked. These figures are minima since they concern only immediately heard words. Many words that may seem spontaneous are in fact delayed imitations heard days or weeks previously. At 13 months children who imitate new words show a greater increase in noun vocabulary at four months and non noun vocabulary at eight months. A major predictor of vocabulary increase in both 20 months, 24 months, and older children between 4 and 8 years is their skill in repeating nonword phone sequences. This is also the case with children with Down's syndrome. The effect is larger than even age: in a study of 222 two-year-old children that had spoken vocabularies ranging between 3–601 words the ability to repeat nonwords accounted for 24% of the variance compared to 15% for age and 6% for gender.Nonvocabulary expansion uses of imitation
Imitation provides the basis for making longer sentences than children could otherwise spontaneously make on their own. Children analyze the linguistic rules, pronunciation patterns, and conversational pragmatics of speech by making monologues in which they repeat and manipulate in word play phrases and sentences previously overheard. Many proto-conversations involve children repeating what each other has said in order to sustain social and linguistic interaction. It has been suggested that the conversion of speech sound into motor responses helps aid the vocal "alignment of interactions" by "coordinating the rhythm and melody of their speech". Repetition enables immigrant monolingual children to learn a second language by allowing them to take part in 'conversations'. Imitation-related processes aid the storage of overheard words by putting them into speech-based short- and long-term memory.Language learning
The ability to repeat nonwords predicts the ability to learn second-language vocabulary. A study found that adult polyglots performed better in short-term memory tasks such as repeating nonword vocalizations compared to nonpolyglots though both are otherwise similar in general intelligence, visuo-spatial short-term memory and paired-associate learning ability. Language delay in contrast links to impairments in vocal imitation.Speech repetition and phones
research upon the human brain finds that 81% of areas that show disruption of phone identification are also those in which the imitating of oral movements is disrupted and vice versa; Brain injuries in the speech areas show a 0.9 correlation between those causing impairments to the copying of oral movements and those impairing phone production and perception.Mechanism
Spoken words are sequences of motor movements organized around vocal tract gesture motor targets. Vocalization due to this is copied in terms of the motor goals that organize it rather than the exact movements with which it is produced. These vocal motor goals are auditory. According to James Abbs 'For speech motor actions, the individual articulatory movements would not appear to be controlled with regard to three- dimensional spatial targets, but rather with regard to their contribution to complex vocal tract goals such as resonance properties and or aerodynamically significant variables'. Speech sounds also have duplicable higher-order characteristics such as rates and shape of modulations and rates and shape of frequency shifts. Such complex auditory goals are detectable from the speech sound which they create.