|Year : 2021 | Volume
| Issue : 5 | Page : 469-480
|The systematic review and meta-analysis of oral sensory challenges in children and adolescents with autism spectrum disorder
Sachin Haribhau Chaware1, Surekha Godbole Dubey1, Vinay Kakatkar2, Ajit Jankar3, Swati Pustake4, Abhishek Darekar3
1 Department of Prosthodontics and Crown and Bridge, Sharad Pawar Dental College, DMIMS, Swangi (M), Wardha, India
2 Department of Prosthodontics and Crown and Bridge, SMBT IDSR Dental College Dhamangaon, Nashik, India
3 Department of Prosthodontics and Crown and Bridge, MIDSR Dental College and Hospital, Latur, India
4 Department of Prosthodontics and Crown and Bridge, MGV KBH Dental College and Hospital, Nashik, Maharashtra, India
|Date of Submission||22-Apr-2021|
|Date of Decision||28-Apr-2021|
|Date of Acceptance||01-May-2021|
|Date of Web Publication||13-Aug-2021|
Dr. Sachin Haribhau Chaware
Department of Prosthodontics and Crown and Bridge, Sharad Pawar Dental College, DMIMS, Swangi (M), Wardha, Maharashtra.
Source of Support: None, Conflict of Interest: None
| Abstract|| |
Objectives: The purpose of the systematic review was to provide a summary and evaluation of oral sensory challenges in children and adolescents with autism spectrum disorder (ASD). Materials and Methods: The review evaluated 19 studies that met the inclusion and search criteria. The review is registered in Prospero Database (CRD42020179852). The 14 studies (8 case–control, 4 cohort, 1 observational, and 1 randomized clinical trial) were related to speech disorders and five studies (case–control studies) were associated with feeding and eating behavior in ASD. The meta-analysis of speech and feeding behavior was analyzed by using risk ratios (RRs) and standardized mean difference (SMD), with 95% confidence interval (CI). Results: The meta-analysis found a statistically significant difference of speech disorder between children and adolescents of ASD when compared with typically developed or other neurotypical children of similar age [0.4891 (95% CI = −2.4580; 1.4799), fixed effect; −0.1726 (95% CI = −14.2925; 7.5697), random effect]. Feeding and eating behavior reported a statistically significant difference between ASD children and adolescents with similar age group of typically developed controls [0.0433 (95% CI = −0.3531; 0.4398), fixed-effect; 0.3711 (95% CI = −3.0751; 3.8172), random effect]. Conclusion: The speech errors and feeding behavior were more consistent in ASD than in typically developed controls. The oral sensory challenges such as speech disorder and feeding behavior were more prevalent in ASD children and adolescents than in typically developed children and adolescents of the same age group. There was a significant lack in oral sensory-motor synchronization, incomplete motor planning, and poor oral neuromuscular coordination.
Keywords: Autism, autism spectrum disorder, dental specialty, feeding difficulty, language, oral receptors, speech
|How to cite this article:|
Chaware SH, Dubey SG, Kakatkar V, Jankar A, Pustake S, Darekar A. The systematic review and meta-analysis of oral sensory challenges in children and adolescents with autism spectrum disorder. J Int Soc Prevent Communit Dent 2021;11:469-80
|How to cite this URL:|
Chaware SH, Dubey SG, Kakatkar V, Jankar A, Pustake S, Darekar A. The systematic review and meta-analysis of oral sensory challenges in children and adolescents with autism spectrum disorder. J Int Soc Prevent Communit Dent [serial online] 2021 [cited 2022 Jun 28];11:469-80. Available from: https://www.jispcd.org/text.asp?2021/11/5/469/323819
| Introduction|| |
Autism spectrum disorder (ASD) is the most prevalent neurodevelopmental condition of unknown etiology. The prevalence ratio of ASD was thought to be 1 in 5000 in 1975; however, it had risen to 1 in 150 in 2002 to 1 in 68 in 2008 (around 50-fold in 40 years).,,, In India, the prevalence rate of ASD is 1 in 500 (2/1000) to 1 in 166 children (6/1000).,
The oral sensory challenges as part of a generalized sensory processing disorder in ASD has a major impact on day-to-day activities of children with ASD. The speech disorder and feeding behavior are the two major oral sensory challenges associated with ASD. The ASD children show complete or partial lack of speech, delayed speech, speech inadequacy, and deficient in receptive and expressive speech and language impairment., The speech disorder in ASD children is related to oral motor disorder, which further simplified as a lack in synchronization of oral sensory and motor receptors and their pathways, i.e., impairment in motor programming and planning., The speech disorder is commonly referred to as a speech sound disorder (SSD). The SSD mainly comprises three types, i.e., articulation errors, phonological errors, and motor-speech disorder, which further divided into childhood apraxia of speech (CAS) and prosody. Articulation errors are mainly due to inadequate motor learning, and these errors appear to be persistent, continuing into adolescence and adulthood., The phonological errors are due to imperfection in the structuring of word or phrase. The motor-speech disorder (MSD) includes speakers of all ages whose significant intelligibility deficits are associated with motor speech impairment. MSD includes dysarthria and CAS. It is a disorder of impaired speech production due to difficulties in oral muscular control of speech mechanism and speech motor planning and programming. The significant features of MSD are speech delay, vowel error, unspecific phonetic distortion, and slow speech rate. The third significant speech error is prosody, which described the speech sound parameters such as pitch, rate, intonation, and loudness. Children and adolescents of ASD have higher rates of inappropriate prosody, which is distinguished by repetition of words (echolia), high pitched words and phrases, and misplaced stress.
Atypical feeding behavior is the second major oral sensory problem. ASD children usually show a limited selection of food, often they are referred to as “picky eaters.” These children are reluctant to try new food or experienced difficulty in selection of new food., An atypical feeding behavior is mainly associated with oral sensitivity or psychological behavior toward the food. The limited selection in food often shows nutritional deficiency with ASD children.
ASD is a lifelong condition because it does not have a complete core treatment and mostly depends on various therapies such as occupational therapy, sensory integration therapy, and applied-based analysis therapy used for generalized sensory processing disorder in ASD. In the oral therapies, speech therapy is the central therapy used for speech recognition and stimulation. However, it has been observed from the literature studies that oral sensory processing disorder in ASD was majorly associated with oral sensory and motor receptors. There is significant lack of synchronization between oral sensory and motor receptors and hyperactivity or hypoactivity (sensory seeking) associated with oral receptors. However, previous systematic review does not mention any such causal relation., Hence, the objective of the present review is to evaluate the cause-to-effect relationship between local oral sensory-motor disturbance and SSD and feeding behavior in children and adolescents with ASD.
| Materials and Methods|| |
This systematic review was designed according to the guidelines of the Preferred Reporting Item for Systematic Review and Meta-analysis Guidelines (PRISMA)., The review is registered in Prospero Database (CRD420201179852, https://www.crd.york.ac.uk/PROSPERO).
A systematic search was conducted from January 2000 to December 2018. Peer-reviewed journal articles were identified using the following electronic databases: Cumulative Index to Nursing and Allied Health Literature (CINHAL), MEDLINE (PubMed), Cochrane Library, Education Resources Information Center (ERIC), pyscINFO, Scopus speechBITE, Web of Science, and Google Scholar. Keywords used are: Autism; speech; language; neuroimaging; first word; language development; autism spectrum disorder; sensory processing disorder; sensory integration; speech in noise; food selectivity; sensory sensitivity; food; taste; feeding assessment; mealtime behavior; selective eating; picky eater; articulation disorder; phonetics oral receptors; somatosensory awareness. Related articles were identified from the existing reviews and study design. The PICOS protocol is mentioned in [Table 1].
The initial phase is the primary screening of the identified articles. Due to the broad nature of the initial search, references were further filtered according to title, abstract, and keyword. Following the initial search, a reference list of the retrieved articles was obtained manually. Additionally, authors and keywords were searched again in Google Scholar to ensure all relevant articles. Search included only those studies that discuss an oral sensory-motor relationship with oral sensory challenge in ASD. The studies associated with psychological behavior with ASD were excluded.
The risk of bias was assessed using the Cochrane Collaboration tool. All the selected articles were assessed by the first and second authors, and any variant view of the selected articles was further assessed by the third and fourth authors. The studies were evaluated using the following domains: random sequence generation, allocation concealment, blinding of participant and personal blinding of the outcome assessment, incomplete outcome data, selective outcome reporting, and other bias. The studies were rated further as a risk of bias (low, medium, and high) by the reviewers.
Data extraction was independently done by two reviewers using the specific format. The specific important information was as follows: year of publication, ASD diagnosis with sensory processing disorder, study population, diagnostic tool, age and IQ of the ASD children, and follow-up period.
Tools used for measuring outcomes were categorized as speech assessment: articulation disorder, phonological errors, CAS, and prosody; feeding behavior: selection of the food in relation to oral sensitivity.
The outcomes were presented for relevant studies in a graphical format where possible. The studies were graphed according to the mean difference with the level of significance being P ≤ 0.01. In the meta-analysis, heterogeneity was measured as a final calculation of effect size and CI around that effect size by using a random-effects and fixed-effects model in the forest plot.
| Results|| |
The review identified 573 articles. A review of 65 full-text articles identified 37 articles for qualitative synthesis and 19 articles that met the inclusion criteria, search criteria, and confidence in ASD diagnosis [Figure 1]. Twenty-eight articles were excluded from the study with subsequent reasons: no speech and feeding assessment, non-ASD participant, not peer-reviewed, and outcome assessment in relation to speech therapy and oral stimulation. The articles were distributed according to the assessment of speech in relation to phonological disorder, speech articulation, speech motor disorder, and prosody: There are a total of 14 studies that were evaluated, out of which 8 are prospective case–control studies and 4 are prospective cohort studies. There is a single observational study and a single randomized clinical trial [Table 2]. There are a total of five studies on associated sensory oral issues, and all were prospective case–control studies on feeding behavior in relation to oral sensitivity [Table 3].
|Table 2: Methodological description of the comparative studies of speech disorder|
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|Table 3: Methodological description of the comparative studies of feeding and eating behavior|
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Risk of bias assessment
There were 19 studies included for the assessment of risk of bias. The majority of the studies showed a moderate risk for selection bias as the less number of sample sizes and comparative group for sample size were for typically developed children but the criteria for typically developed children were not mentioned in many studies and a few studies included sample of other neurological disorders along with typically developed children. Selective reporting bias was higher for the studies of feeding behavior. was a mild risk for detection bias and attrition bias, due to involvement of other neurological disorders. Publication bias of speech disorder was determined using funnel plot [Figure 2].
The meta-analysis was performed by using a fixed- and random-effects model. The overall acceptable heterogeneity is to confirm the homogeneity among the studies (i2=96%). The result of speech assessment reported statistically significant heterogeneity (Q = 235.8259, df = 8, and P < 0.0001). The statistics of the fixed-effect model reported the mean difference (MD) to be −0.4891 (95% confidence interval (CI) = −2.4580; 1.4799). The random-effects model reported the MD to be −0.1726 (95% CI = −14.2925; 7.5697) ([Table 4] and [Figure 3]). The meta-analysis reported a statistically significant difference between the typically developing or related neurotypical control group and children and adolescents of the ASD group with varying ages.
|Figure 3: A: Standardized mean difference (SMD) of comparative studies of speech disorder. B: Percentage difference of types of speech errors between high functioning autism (HA), Asperger’s syndrome (AS), and control group (CG) |
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The meta-analysis of feeding behavior reported an overall acceptable heterogeneity among the studies (i2=95%). The result of feeding reported statistically significant heterogeneity (Q = 29.0677, df = 4, and P < 0.0001). The statistics of fixed-effects model reported the MD to be 0.0433 (95% CI = −0.3531; 0.4398). The random-effects model reported the MD to be 0.3711 (95% CI = −3.0751; 3.8172) ([Table 5] and [Figure 4]). There was a statistically significant difference of feeding behavior between ASD children and adolescents than typically developed children and adolescents of the same age group.
|Figure 4: A: Percentage differences of food selection by ASD sample. B: Percentage differences of eating behavior|
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| Discussion|| |
The purpose of the systematic review was to determine the oral sensory challenges and its relation with oral sensory motor synchronization in ASD children and adolescents. The review has taken 20 studies for meta-analysis and synthesized the following information.
A failure in speech development and language impairment is considered being a significant social stigma for ASD children. Speech evaluation in ASD is an important diagnostic sign for pediatric psychologists and psychotherapists. Speech evaluation is also an important parameter to determine the outcome of the ASD. The development of some amount of speech before the age of 5 years is a strong predictor of a better outcome in ASD. The retrospective study was conducted by Mayo et al. on 119 ASD children, between the age group of 3 and 7 years. This study suggested that children who have not spoken their first words by age 2 may be at risk for a host of later functional deficits.
The speech errors in ASD are mainly due to oral speech motor disorder, which is commonly described as an SSD. It is a group of disorders that encompass various types of speech errors that are further divided into three types: (1) articulation disorder: improper articulation of oral component (fricative sound); (2) phonological disorder (lack in synchronization between oral sensory and motor receptors); and (3) motor-speech disorder (poor oral muscular coordination while speech production). The prevalence of SSD is mentioned in two forms, initially, it was mentioned that younger ASD children show a higher prevalence than the older one. The prevalence of SSD for preschool children is 5–15% when compared with 1–6% for older ASD children. However, the current research observed that there is an increase in the concomitant articulation and phonological speech disorder.
About 60% of the ASD children reported moderate-to-severe language problems and 21% reported major phonological problems. Shriburg et al., have conducted analytical studies on ASD subjects to evaluate features SSD. The study reported that there is speech delay in almost 15.2% of 46 ASD subjects in the age group of 4–7 years. The percentage of speech errors is 31.8% at the age group of 6–7 years; however, the previous estimated prevalence is 7.9% at 8 years of age. The authors claimed that difference of prevalence cannot be directly compared due to normalization of prevalence, which is not possible by chance in one year. The study explained that the articulation errors are often due to inaccurate motor learning and the inability to execute correct motor learning for the phonetic production of the speech sound. Articulation refers to a fricative sound produced by motor movements of the tongue to various parts of the hard and soft palate. Errors in fricative sounds are due to inaccurate motor learning. Articulation errors have been reported in approximately one-third of high functioning autism, with difficulty in producing “s” and “r” sound. Shriburg et al. claimed that speech errors appear to be persistent, continuing into adolescence and adulthood. More percentage of residual speech errors are associated with high functioning autism and Asperger’s syndrome.
About 12% higher phonological speech errors and 41% of minor speech errors in ASD subjects are reported by Cleland et al. Asperger’s syndrome has fewer errors than high functioning autism. However, Rapin et al. demonstrated a 24% percentage of higher phonological errors and 76% of borderline expressive phonology in ASD subjects. The significant observation of the Rapin study is that it disagrees with the previous hypothesis that minor phonological errors are present in school-aged children of ASD, as the authors claimed that only verbal children were mentioned with the previous studies. The limitation of the study is that as no control is used it is difficult to analyze actual errors made by the ASD children. The phonological errors are difficulty in the construction of the expressive sentence and dysfluent speech.
There are two prospective studies on motor-speech disorders that reported that many people with autism experience substantial motor difﬁculties including deﬁcits in gross motor, ﬁne motor, and oral motor skills, and abnormal imitation of oral-motor movements can broadly affect speech and motor development, including impairment in daily functioning in the home and school settings.
The motor-speech disorder has two subtypes: (1) CAS: it is an impaired speech production due to difficulty in the muscular control of the speech mechanism; (2) prosody: it is the type MSD of suprasegemental features of speech which include the use of stress, pitch, rate, intonation, and loudness., These features enhance communication by adding a grammatical, pragmatic, and affective meaning of linguistic information. The CAS is usually associated with ASD children but it has very low prevalence, and prosody is the disorder of adolescent and adult speaker of ASD.,
The prosody is the feature of speech expression associated with stress, pitch, rate intonation, and loudness. The prosody dilutes the communication by adding grammatical, pragmatic, and affective meaning to linguistic information. The prevalence of different features of prosody is mentioned in [Figure 3]. There are a total of six analytical studies including Shriburg et al. which evaluated the CAS and prosody. The three studies, Paul et al., Shriburg et al., and Diehl et al., were conducted on adolescents and adults. The study by Paul et al. is a prospective study on the adult male speaker of ASD. The rest of the three studies are McAlpine et al., Nadig and Shaw,and McCann et al., conducted on ASD children. The significant findings of the studies show that the ASD speaker develops stress while making communicative and meaningful words and phrases. ASD speakers show a high percentage of residual articulation distortion errors. ASD children show high pitch sound, high frequency stress vowels, a higher percentage of spontaneous speech than repeated words, misinterpreted spoken language, and poor prosodic skills. A randomized clinical trial by Chenausky et al. experienced that auditory motor mapping training (AMMT; speech therapy technique) showed improvement in speech outcome when compared with speech repetition therapy (SRT: rhythmic hand tapping to facilitate sound-motor mapping) of minimally verbal ASD participant. The authors further stated that age is not predictive of response to treatment. The younger children possess more latent ability to learn speech, joint attention and ability to tolerate pedagogic activities for extended period of time when compared with older children.
Recently, Chenausky et al. examined 54 low-verbal and minimally verbal ASD individuals (ages: 4.4–18) for motor-speech impermanent. The study observed that very few individuals experienced occasional speech, mute speech, and disordered speech. However, the authors claimed that there was considerable heterogeneity among the 54 participants of ASD with respect to language and speech production ability. In addition, the authors suggested that therapy should follow the sensory profile of ASD subjects. If the selected therapy does not give measurable benefits, then alternative therapy should be chosen other than speech-language pathology, and frequent follow-up is essential to evaluate benefit of new therapy. Similarly, Shriburg et al. investigated a group of subjects of complex neurodevelopmental disorder (n = 346, 13.3 average chronological age), including autism (n = 42) for the prevalence of speech-motor delay. About 47.7% of the total subjects met the criteria of MSD, and the autism group showed 15.4% of the subjects with speech-motor delay. Namasivayam et al. documented the dynamics of oral and laryngeal component of speech. The authors claimed that speech errors in SSD may potentially arise as a disarticulation of speech component, an immature speech motor system with limited speech motor skills, and restricted speech among the physical, physiological, and functional areas of tongue, palate, and lips.
ASD children have significantly more feeding problems than typically developing children. The estimated prevalence of feeding problems in ASD children is as high as 90%. The major parental survey on food selection reported that the selection of the food depends on oral sensitivity and behavior., The selection of the food and eating habits majorly depend up oral sensitivity, as a part of overall generalized sensitivity.
The ASD children and adolescents show a high percentage of food neophobia when compared with typically developing controls. They have a preference for familiar food and dislike textured food and strong taste. The children with ASD exhibited more food refusal and were limited in the selection of food and ate fewer vegetables and often have the problem of gag. The significant experimental finding shows that the mylohyoid muscle action during the food grasp stage was much inferior to typically developing children.
ASD children with oral hypersensitivity show a limited range of food selections; often they are referred to as “picky eaters.” ASD children are reluctant to select new food and whatever the selection of the food will be based on type, texture, consistency, smell, the sight of food, and gastrointestinal problems. The presence of pickiness is most common in young ASD children and creates more restrictions in the selection of food patterns and may be extended to the adolescent age. In contrast, oral hyposensitive children often related to unaware of sound during mealtime (auditory), changing visual input in the environment (visual), love and crave for intense flavors, i.e., sweet, sour, salty, spicy, and usually become “condiment kids” (gustatory), unaware of even strong environmental odors (olfactory). Oral hyposensitive children are messy eaters; getting food all over their face and/or leaving bits of food in their mouth at the end of a meal. Children drool excessively beyond the teething stage. They always seem to have something in their mouth such as toys, pens, pencil tips, gum, candy, or inedible object. The feeding problem in ASD children has a major impact on nutritional values as there is a lack of fruits, vegetables, and various other nutritional foods that affect the growth of ASD children.
| Conclusion and Recommendation|| |
The review investigated 19 studies of speech disorder and feeding behavior in children and adolescents of ASD. It has been observed that ASD subjects experienced more speech problems when compared with typically developed children. The significant speech errors noticed with the ASD subjects are articulation error, phonological error, expressive language error, and receptive language error. However, the adolescent group experienced mild-to-moderate prosody. The significant observation of the review is that the majority of the speech errors in ASD are mainly due to impairment of local oral sensory-motor disturbance, incomplete motor planning, and poor oral neuromuscular coordination. In addition, limited number of subjects experienced major speech errors such as CAS and childhood dysarthria, which are related to central disturbance. With regard to feeding and eating behavior, ASD subjects have difficulty in selection or resistance to try new food, often they are referred to as “picky eaters.” The range of oral sensitivity (hypersensitive or hyposensitive) may be the major factor for the selection of food.
The review observed that oral sensory-motor disturbances and its effect on speech and feeding behavior in ASD subjects may focus the attention on precise oral stimulation. Hence, the review recommends that there may be significant need of oral stimulation by using speech-sensory tools. The stimulation articulating surface of speech component (articulation errors) and control of laryngeal air sound passage (phonological error) enhance the muscle coordination for tone, pitch, and loudness of speech sound (prosody) and may have a significant impact on speech. The oral stimulation may fulfill the sensory demands of oral tissue (sensory seeking) or decrease the sensory overload, which may control the feeding and eating behavior. The therapeutic role of oral stimulation has been already proved in subjects with cleft lip and palate and oral motor disorder such as Down syndrome., Hence, oral stimulation may act as a single therapy or may assist the speech therapy for the betterment of speech and feeding behavior in ASD.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
Chaware contributed to the research question, search strategy, concept statement, eligibility criteria, screening of the articles, and meta-analysis. Dubey contributed to data acquisition, eligibility criteria, screening of the article, and evidence summary. Kakatkar and Jankar contributed for screening of article literature, search quality assessment, and meta-analysis. Pustake and Darekar contributed for risk of bias and software management.
Ethical policy and institutional review board statement
Patient declaration of consent
Data availability statement
Electronic databases has been sourced from Cumulative Index to Nursing and Allied Health Literature (CINHAL), MEDLINE (PubMed), Cochrane Library, Education Resources Information Center (ERIC), pyscINFO, Scopus speechBITE, Web of Science, and Google Scholar.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4]
[Table 1], [Table 2], [Table 3], [Table 4], [Table 5]
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