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Much of the past research on language development has focused on auditory language learned by hearing children. Recently, researchers such as Jamieson (1995) and Masataka (1992) have begun to study whether language acquisition proceeds in the same manner for deaf children as for hearing children. Results from studies of hearing children learning different languages have shown that the first stage in the acquisition of language is babbling, which usually appears between 7 and 10 months (Lane, Hoffmeister, & Began, 1996). Next, between the ages of 12 and 18 months, children make one-word utterances, and by 22 months, most children are at the two-word utterance stage. Children begin to modify words and learn rules for sentence construction by 36 months (Lame at al. , 1996). Parents play an important role in the language development of their children.
One unique manner in which parents, and many other adults, talk to children is called "mothers. " Mothers is characterized by short sentences, changes in voice fluctuation, slow tempo, and repetition of words. The properties of mothers are thought to enhance early language acquisition by eliciting the infant's attention and demonstrating important aspects of the language (Masataka, 1992). Also, the richness of the language environment the child is exposed to, usually measured by the frequency and type of word the child hears, is positively correlated with the development of language (Levine, 1981). Children also take active control of language learning. Through babbling, by which an infant repeats consonant and vowel combinations, the child gains experience in language.
Once the child reaches the level of speaking word sequences in the native language, ha or she begins to acquire grammatical rules for sentences (Bark, 1997). Although children in this stage frequently make grammatical mistakes, these mistakes are evidence that children are learning and thinking about grammatical rules (Crown, 1994). private speech, or speech that is spoken aloud but not meant for the benefit of others, is another milestone in the language development of children. Private speech is a factor in cognitive development that helps link thought and language (Jamieson, 1995). Language Development in Deaf Children So far, language acquisition has only been discussed in terms of children who learn language by hearing those around them speak. However, there is a substantial subset of children who cannot do this because they are deaf.
Most of the research in the past dealing with language development has focused on hearing children, and many of the ideas which coma from that research have had an auditory basis. Recently, researchers have begun studying deaf children to sea if their processes of acquiring language are similar to those of hearing children. Researchers have studied whether parents of deaf infants use a type of mothers in their communications with their infants and whether the signed language environment has an effect on the language development of children (Masataka, 1992; Spencer, 1993). Also, other researchers have focused on whether babbling occurs in deaf children and whether deaf children use a form of private speech (Petitto & Marentette, 1991; Cook & Harrison, 1995). In addition, some research has looked at the errors deaf children make in learning sign language and has compared them to errors made by hearing children learning spoken language (Crown, 1994). Mothers.
One experiment to determine whether deaf mothers use a form of manual mothers to communicate with their deaf babies was performed by Masataka (1992). Eight deaf mothers whose first learned language was Japanese Sign Language were each observed interacting with her firstborn deaf infant and also with an adult deaf friend who also signed in Japanese Sign Language. These interactions ware videotaped and the signs were transcribed by two independent observers who recorded the duration of signs, the levels of exaggeration of the signs, and the number of repeated signs Masataka found that the mothers repeated significantly more signs when communicating with their infants than when communicating with their adult friends. Also, the duration of the individual signs directed toward the infants was longer than signs directed toward the adults.
Finally, the mean scores for the maximum and average values of the angles for each sign were significantly larger when the signs were aimed at the infant. These results led Masataka (1992) to conclude that deaf mothers do use a manual form of mothers when communicating with their deaf infants. As in spoken mothers, there was more repetition of symbols, a slower rate of delivery, and exaggerated presentation. Masataka suggested that manual mothers elicits stronger responses from infants and helps them to better acquire sign language.
Sign Language Development and Hearing Parents. Hearing parents can also benefit their deaf children by using sign language as a form of communication. Spencer (1993) observed the play between seven mothers and their deaf. infants. The families were all participants in various intervention programs that were designed to help deaf children acquire language. A trained professional spent three to five hours per week in the home teaching parents sign language and providing other services for the parents and infant.
Researchers observed the mother and child playing together and recorded the language productions of the infants and the mothers. The mothers also took part in three structured interviews. Spencer reported that mothers who signed often when their infants were 12 months old continued to sign, often more frequently, when their infants were 18 months old. The sign production of infants at 18 months was positively correlated with the number and variety of signs that mothers produced six months earlier.
She also found that some of the infants were capable of expressive language during the same time frame as their hearing counterparts, even though the number of signs produced by the deaf infants' mothers did not reach the number of words spoken by mothers of hearing children. Spencer (1993) concluded from these results that infants' acquisition of sign language was related to the quantity of signs the mother had used. In general, an environment rich in signing, even non-fluent signing, helped the infants acquire language in a tine frame equal to that of hearing children. "Sign Babbling" and Private Speech. Deaf and hearing children also exhibit similarities in the early stages of language acquisition. Petitto and Marentette (1991) gathered experimental and naturalistic data from two deaf infants of deaf parents and three hearing infants of hearing parents.
The deaf infants ware in the process of acquiring American Sign Language (ASL) as their first language, and the hearing infants ware not exposed to sign language. All infants' manual activities were recorded and examined for evidence of sign babbling. Petitto and Marentette found that although deaf and hearing infants displayed equal numbers of gestures, deaf infants produced more sign babbling than did hearing infants. The deaf infants engaged in manual babbling by 10 months of age (the youngest age tested), the same tine frame in which their hearing counterparts developed vocal babbling.
Furthermore, stages of sign babbling paralleled stages of vocal babbling, and, as in vocal babbling, frequently used phonetic units in sign babbling were involved in the most frequent first babbling units of deaf infants. Because of these parallels between manual babbling in deaf infants and vocal babbling in hearing infants, Petitto and Marentette (1991) concluded that language acquisition was universal and not reliant on the development of the vocal tract. Instead, they argued, because babbling occurred at approximately the same time in hearing and deaf infants, language acquisition was based on a timetable of brain maturation. This brain language capacity was able to process different types of signals, both manual and vocal, resulting in similarities in language development between deaf and hearing infants. Another similarity between language development of deaf and hearing children is the occurrence of private signing in deaf children.
Private signing has the same characteristics and serves the same function as private speech does for hearing children (Cook & Harrison, 1995). Private speech is uttered aloud, but is not produced for the benefit of communicating with others. In the Cook and Harrison study, teachers filled out one survey for the most literacy-developed and the least literacy-developed preschool students and gave the parents of these selected students surveys to complete. The surveys included a section on private signing that was answered only by teachers and parents of students who used sign language. Cook and Harrison found that a high percentage of both the most advanced and least advanced students used private sign in the classroom and at home, although the advanced students showed a greater incidence in some learning Situations.
Deaf children signed to themselves when they read privately as well as when they played with toys and acted out stories. Also, private sign was used to express emotions and for self-...
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Research essay sample on Parallel Language Development In Deaf And Hearing Children
