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This dissertation discusses the convergence of aided augmentative and alternative communication (AAC) systems, the language acquisition and development of young children who are minimally verbal or nonverbal who acquire their native language while simultaneously learning to use an aided AAC system, and explicit and implicit elements that influence language outcomes. Factors investigated include those related to language acquisition universals, the AAC system, the young aided AAC user, and practices, philosophies, and beliefs of speech-language pathologists (SLPs). Further examined were: (a) language acquisition parallels in atypical populations who do not possess the full range of senses who have been shown to develop language, and (b) analogies between the linguistic structures of pidgins, interlanguages, and the syntax of young aided AAC users. This dissertation employed a survey methodology to capture the practices and beliefs of SLPs as a means of identifying potential contributing factors to the reduced linguistic outcomes of these children. Quantitative findings revealed statistically significant differences in SLPs’ perceptions of confidence and qualification with the two populations of children with language impairments who use an oral modality and young aided AAC users. Descriptive trends across all constructs measured suggested differences in SLPs’ practices, belifes, and perspectives in their work with these two populations. The analysis of the syntactic structures of the language of young aided AAC users revealed definitive parallels with the construct of interlanguages.

Many speech-language pathologists (SLPs) in a Midwest urban public school system have experienced barriers that prohibit the effective use of augmentative and alternative communication (AAC). The result has left some students with speech language impairments (SLI) without the communication skills for meaningful relationships and success in and out of school. The purpose of this exploratory case study was to determine the perceived barriers of 8 local school SLPs regarding the successful implementation of AAC and their suggestions for addressing the problem. Data were collected from semi-structured interviews with the SLPs. Data collection and analysis were grounded by Ely's conditions of change theory to better understand what conditions were not being met for implementing AAC. The findings suggested that SLPs and teachers lacked the needed knowledge, experience, and time to properly implement AAC. The participants also indicated the need for more participation and commitment from their colleagues, school leaders, and the students' family members, which would also require additional training and collaborative planning time. The recommendations are that school administrators provide additional training and time for SLPs, their colleagues, and students' family members to learn how to properly help students with SLI use AAC in the classroom. The results of this study could help students with SLI by increasing the use of AAC in the school setting, home, and community. This could increase learning opportunities, student achievement, and relationships for students using AAC.

Thesis (Ph.D.)--Indiana University, 2009. / Title from screen (viewed on January 13, 2010). School of Nursing, Indiana University-Purdue University Indianapolis (IUPUI). Advisor(s): Marsha L. Ellet, Rebecca S. Sloan, Lynne A. Sturm, Melinda M. Swenson. Includes vitae. Includes bibliographical references (leaves 104-123).

Syftet med denna studie var att undersöka skriftspråkslärande efter nybörjarstadiet, hos elever utan eget tal; med severe speech and physical impairment (SSPI) samt alternativ och kompletterande kommunikation (AKK). Frågeställningarna var följande: - Hur beskriver dessa elever själva sitt skriftspråkslärande? - Vilka fruktbara arbetssätt och miljöer för dessa elevers skriftspråkslärande finns dokumenterat i forskning? Metoderna innebar en livsberättelseintervju genom computer assisted personal interviewing (CAPI), samt systematiska litteraturstudier med en kvalitativ metasyntes som mål. Resultaten visar vikten av att dessa elever når en god läs- och skrivförmåga. Möjligheter öppnar sig för lärande och inte minst kommunikation över tids-, rums- och persongränser. Avgörande för elevers fortsatta skriftspråkslärande var förväntningar, kvalitet på undervisning samt stimulans inom den grundläggande emergent literacy-fasen. Här spelar ålder mindre roll, med andra ord är det aldrig för sent att utveckla sitt skriftspråkslärande. Pedagogiska konsekvenser i form av interventionsprogram måste möta alla delar inom skriftspråkslärandet för att ge resultat. För att framgångarna ska bli bestående krävs samarbete mellan skola, hem och experter. Slutsatser är att engelskspråkig forskning visar goda resultat efter deltagande i interventionsprogram. Svensk forskning i samma anda med tvärvetenskapligt samarbete brådskar, så gör även kompetensutveckling för berörda lärare.

In this thesis, we analyze the bandwidth requirements of MPEG-4 AVC video traffic and then propose and evaluate the accuracy of new MPEG-4 AVC video traffic models. First, we analyze the bandwidth requirements of the videos by comparing the statistical characteristics of the different frame types. We analyze their coefficient of variability, autocorrelation, and crosscorrelation in both short and long term. The Hurst parameter is also used to investigate the long range dependence of the video traces. We then provide an insight into B-frame dropping and its impact on the statistical characteristics of the video trace. This leads us to design two algorithms that predict the size of the B-frame and the size of the group of pictures (GOP) in the short-term. To evaluate the accuracy of the prediction, a model for the error is proposed. In a broadband cable network, B-frame size prediction can be employed by a cable headend to provision video bandwidth efficiently or more importantly, reduce bit rate variability and bandwidth requirements via selective B-frame dropping, thereby minimizing buffering requirements and packet losses at the set top box. It will be shown that the model provides highly accurate prediction, in particular for movies encoded in high quality resolution. The GOP size prediction can be used to provision bandwidth. We then enhance the B-frame and GOP size prediction models using a new scene change detector metric. Finally, we design an algorithm that predicts the size of different frame types in the long-term. Clearly, a long-term prediction algorithm may suffer degraded prediction accuracy and the higher complexity may result in higher latency. However, this is offset by the additional time available for long-term prediction and the need to forecast bandwidth usage well ahead of time in order to minimize packet losses during periods of peak bandwidth demands. We also analyze the impact of the video quality and the video standard on the accuracy of the model.

The onset of a progressive, fatal illness such as Motor Neuron Disease (MND) inevitably results in physical and communication disabilities that impinge on the individuals’ ability to remain functionally independent. The loss of speech as a result of dysarthria, a motor speech disorder, is one of the most profound changes that the person with MND will experience. The decline in the individuals’ speech intelligibility, that negatively influences communication effectiveness, implies that in 80% of cases alternative and augmentative communication (AAC) strategies are required to support the daily communication needs of individuals with MND. The dyadic nature of chronic illness implies that multiple aspects of one of the most important adult relationships, marriage, will be affected. Roles and responsibilities performed by each member of the couple will continually change as the disease progresses. The emotional trauma of adjusting to the unavoidable alteration in their relationship elicits strong emotions such as guilt, anger and frustration. Communication is one of the most constructive ways of dealing with these emotions. The ability of spouses to convey their innermost thoughts, feelings and intimacy through communicative interaction is vitally important in marital communication. The aim of this study was to compare how persons with MND and their spouses perceive changes in their marital communication in relation to the deteriorating speech of persons with MND. Fourteen couples divided into two participant groups, persons with MND and spouses, participated in this non-experimental correlational research study. Data was collected during three visits at six-monthly intervals over a 12 month period. At each of these visits both participant groups completed a variety of objective and subjective measures, of which twenty percent were interrated by independent raters. Results confirmed the inevitable decline in speech intelligibility of persons with MND across the disease progression. The persons with MND did not report a change in their perception of marital communication although their spouses indicated a statistically significant decrease between the first and last visits. Interestingly, there was no statistically significant relationship between the deteriorating speech of persons with MND and the couples’ perception of marital communication, confirming that marital communication was not influenced by decreased speech intelligibility. / Thesis (PhD)--University of Pretoria, 2010. / Centre for Augmentative and Alternative Communication (CAAC) / unrestricted

A severe aphasia following a cerebral vascular accident is characterised by generalised deficits in most speech-language domains. The clinical dilemma remains focused on the extensive verbal speech impairment and in most cases little possibility of regaining verbal speech production. Many individuals living with severe aphasia use augmentative and alternative communication strategies to assist them in getting their communication needs met in their everyday lives. The Blissymbol system is one of the graphic symbol systems that can be used to supplement existing communication and speech strategies of the individual with little or no speech. Although the use of AAC strategies is gaining momentum in its application to severe aphasia, however, there still remain questions on how best to help these individuals learn and retain such strategies. Not only are individuals with severe aphasia faced with a memory task when learning AAC strategies such as Blissymbols, additional complexity to AAC interventions is derived from clinical presentation of severe aphasia. The presence of extensive damage to the neural centers responsible for linguistic processing and semantic retrieval makes learning of new AAC strategies all the more complicated. Research studies have looked at whether individuals with severe aphasia can learn to recognise and retain Blissymbols. Although these studies have successfully shown that individuals with severe aphasia can learn Blissymbols, there is little information available regarding how these symbols can best be taught and retained over time individuals with severe aphasia. Recently the research that has looked at the application of symbol learning with persons presenting with severe aphasia using computer technology and sophisticated application software has highlighted the importance of therapeutic methods that may enhance the learning of such software. This study looks at the application of the self-generation effect as a viable method for enhancing the recognition of Blissymbols in persons presenting with severe aphasia. The self-generation effect is the finding of superior retention and recall for stimuli constructed or generated by an individual. Memory for stimuli such as words, numbers and pictures were found to be enhanced by the extent to which the individual was involved in its construction. Using a 2X2X3 factorial design, this study compared the recognition levels for Blissymbols taught using two treatment approaches which was the self-generation condition and the non self-generation condition. During three experimental sessions which included two withdrawal periods participants were taught using both treatments to recognise a set of Blissymbols. Recognition levels were tested during recognition probes and retention probes. The results from these probes were compared in order to identify which treatment produced superior recognition levels. The data analysis conducted showed that although there was no recognition advantage for the self-generation effect seen during the three recognition probes some advantage for the self-generation effect was seen during the retention probes conducted. The self-generation effect began to emerge by the final retention probe following a withdrawal period of seven days. The self-generation treatment showed better retention of symbol recognition over time. Previous studies have shown that the self-generation effect failed to emerge with stimuli that were new or unfamiliar. This trend was also seen in this study. The results provide support for a semantic-association theory for the self-generation effect. / Thesis (PhD)--University of Pretoria, 2010. / Centre for Augmentative and Alternative Communication (CAAC) / unrestricted

Cross-cultural differences in the perception of pictorial material has long been established and documented. In the Republic of South Africa, which is increasingly globalized, and where it is appealing from financial, economic and training perspectives, the temptation is to use Western-based AAC symbol systems and strategies in intervention with clients from other language and cultural orientations. The aim of this study was to determine the translucency ratings of specific Blissymbols as rated by six-to seven-year-old Setswana-speaking children. A secondary aim was to determine whether the ratings changed after second and third exposures in order to determine the learnability of these symbols. A brief comparison was made between the results of the current study and the results reported in the Quist et al., study (1998). Thirty-five Setswana learners were exposed to 93 selected Blissymbols, based on a study by Quist et al., (1998). A three-point semantic differential scale, consisting of three faces accompanied each Blissymbol. Participants marked the face that best described his/her perception of the specific symbol’s iconicity. This procedure was repeated over a period of three days. The results indicated that the translucency ratings of the majority of the Blissymbols ranged from moderate to high. The research further demonstrated significant differences in translucency ratings between the first and second exposures, suggesting learning of the symbols. A smaller difference was noted between Days 2 and 3. A correlation in findings was noted between the current study and the Dutch and US studies (Quist et al., 1998). / Dissertation (M (Augmentative and Alternative Communication))--University of Pretoria, 2007. / Centre for Augmentative and Alternative Communication (CAAC) / MA / unrestricted