Early general development and central auditory system maturation in children with cochlear implants - A case series

Language, cognitive, and speech in noise perception abilities of children with cochlear ımplants: a comparative analysis by implantation period and bilateral versus unilateral cochlear implants

PURPOSE

The purpose of this study was to compare the language, cognitive, and speech in noise (SiN) perception abilities of children with cochlear implants (CIs) to those of their peers with NH by grouping them according to their implantation period (12-18 months/19-24 months) and unilateral/bilateral CI use.

METHODS

The sample comprised 50 children with cochlear implants (CIs) and 20 children with normal hearing (NH), ages 6-9 years. Children's language, cognitive, and speech in noise (SiN) perception skills were assessed.

RESULTS

Children with CIs between 12 and 18 months and 19 and 24 months performed more poorly than children with NH on language, verbal memory (VM), verbal-short-term memory (V-STM), verbal working memory (V-WM), rapid naming, and speech in noise (SiN) perception abilities measures (p < 0.001). In addition, children with CIs between 19 and 24 months performed worse on rapid naming and V-WM tasks than children with CIs between 12 and 18 months (p < 0.017). Children with unilateral and bilateral CI performed more poorly than children with NH on language, VM, V-STM, V-WM, rapid naming, and SiN perception abilities assessments (p < 0.001). Additionally children with unilateral CI users performed poorly than children with bilateral CI users on SiN perception (p < 0.017).

CONCLUSIONS

In children with congenital hearing loss (CHL), cochlear implantation between 12 and 18 months or sequential bilateral implantation is not sufficient for these children to perform like their NH peers in language, cognitive, and SiN perception abilities. In addition, intervention approaches should focus not only on increasing language skills, but also on cognitive abilities.

Theory of Mind and Parental Mental-State Talk in Children with CIs

Previous studies have suggested that parents may support the development of theory of mind (ToM) in their child by talking about mental states (mental state talk; MST). However, MST has not been sufficiently explored in deaf children with cochlear implants (CIs). This study investigated ToM and availability of parental MST in deaf children with CIs (n = 39, Mage = 62.92, SD = 15.23) in comparison with their peers with typical hearing (TH; n = 52, Mage = 52.48, SD = 1.07). MST was measured during shared storybook reading. Parents' narratives were coded for cognitive, emotional, literal, and non-mental references. ToM was measured with a parental questionnaire. Children with CIs had lower ToM scores than their peers with TH, and their parents used more literal references during shared storybook reading. There were no significant differences in the frequencies of cognitive and emotional references between groups. Parental emotional references contributed positively to children's ToM scores when controlling for the child's age and receptive grammar only in the CI group. These results indicated some distinctive features in parents of deaf children with CIs' MST and highlighted the role of MST in the development of ToM abilities in this group.

Breast Milk Micronutrients and Infant Neurodevelopmental Outcomes: A Systematic Review

Micronutrients are fundamental for healthy brain development and deficiencies during early development can have a severe and lasting impact on cognitive outcomes. Evidence indicates that undernourished lactating individuals may produce breast milk containing lower concentrations of certain vitamins and minerals. Exclusively breastfed infants born to mothers deficient in micronutrients may therefore be at risk of micronutrient deficiencies, with potential implications for neurodevelopment. This systematic review aims to consider current knowledge on the effects of breast milk micronutrients on the developmental outcomes of infants. The databases Medline, Global Health, PsychInfo, Open Grey, and the Web of Science were searched for papers published before February 2021. Studies were included if they measured micronutrients in breast milk and their association with the neurodevelopmental outcomes of exclusively breastfed infants. Also, randomised control trials investigating neurocognitive outcomes following maternal supplementation during lactation were sought. From 5477 initial results, three observational studies were eligible for inclusion. These investigated associations between breast milk levels of vitamin B6, carotenoids, or selenium and infant development. Results presented suggest that pyroxidal, β-carotene, and lycopene are associated with infant neurodevelopmental outcomes. Limited eligible literature and heterogeneity between included papers prevented quantitative synthesis. Insufficient evidence was identified, precluding any conclusions on the relationship between breast milk micronutrients and infant developmental outcomes. Further, the evidence available was limited by a high risk of bias. This highlights the need for further research in this area to understand the long-term influence of micronutrients in breast milk, the role of other breast milk micronutrients in infant neurodevelopmental outcomes, and the impact of possible lactational interventions.

False Belief Understanding in Deaf Children With Cochlear Implants

Theory of mind (ToM) is crucial for social interactions. Previous research has indicated that deaf and hard-of-hearing children born into hearing families (DoH) are at risk of delayed ToM development. However, it is unclear whether this is the case for DoH children who receive cochlear implants (CIs) before and around the second year of life. The present study aimed to investigate false belief understanding (FBU) in DoH children with CIs. The relationships between false belief task (FBT) performance, sentence comprehension, age at implantation, duration of CI use, and Speech Recognition Threshold were explored. A total of 94 children with typical levels of hearing (TH) and 45 DoH children (age range: 3-8), who received their first CI between 6 and 27 months of age, were tested on the FBT and a sentence comprehension test. Results showed that 4- and 5-year-old children with CIs performed significantly worse than their peers with TH on the FBT; 6- to 8-year-old children with CIs performed similarly to age-matched children with TH. Age at implantation and duration of CI use were correlated with sentence comprehension but not with the FBT. The results indicated that FBU was delayed until the age of 6 years in most of children with CIs.

Central auditory maturation and behavioral outcomes after cochlear implantation in prelingual auditory neuropathy spectrum disorder related to OTOF variants (DFNB9): Lessons from pilot study

The cortical auditory evoked potential (CAEP)-based P1 component acts as a biomarker for cochlear implantation (CI) outcomes in children with auditory neuropathy spectrum disorder (ANSD). To date, early intervention primarily before the age of two years and six months of CI usage is necessary and sufficient to achieve age-appropriate cortical maturation and good prognosis. However, varying degrees of neural dyssynchrony, resulting from the etiological heterogeneity of ANSD, may preclude uniform application of this hypothesis to ensure auditory cortical maturation. Thus, a focused evaluation of those carrying OTOF variants, which may be the salient molecular etiology of prelingual ANSD, would circumvent the issue of heterogeneity. Here, we sought to provide a much better understanding of the brain perspectives (i.e., P1 maturation) in OTOF-associated ANSD subjects and set the stage for an optimal strategy to enhance language development. We conducted a preliminary study comprising 10 subjects diagnosed with OTOF-related ANSD who underwent CI by a single surgeon and subsequently underwent measurements of the P1 component. We observed that DFNB9 subjects who received CI after 2 years of age exhibited “absent” or “anomalous” P1 components that correspond to delayed language development. However, timely implantation, as early as 12 months of age per se, might be insufficient to achieve age-appropriate cortical maturation of DFNB9 in cases with six to seven months of device use. This suggests the importance of sustained rehabilitation in DFNB9 than in other etiologies. Indeed, an additional follow-up study showed that a reduction in P1 latency was linked to an improvement in auditory performance. Collectively, our results suggest that central auditory maturation and successful outcome of CI in DFNB9 may have more demanding requirements, that is, earlier implantation and more sustained rehabilitation. We believe that the current study opens a new path toward genome-based neuroimaging in the field of hearing research.

Psychomotor development of 4-year-old deaf children with cochlear implants: Three case studies

OBJECTIVES

Hearing is one of our most important senses, and hearing ability has an enormous impact on a child's psychomotor development. Children with auditory perception disorders may show abnormal development in terms of speech, language, and communication skills, as well as other disorders involving the cognitive sphere, social-emotional interactions, and motor development. This paper describes different paths of psychomotor development in three 4-year-old children. All were born with bilateral profound sensorineural hearing loss and were implanted early on with a cochlear implant. A longitudinal study of the children's psychomotor development was done for 3 years from the time of cochlear implantation.

METHODS

We present three children with congenital, profound bilateral sensorineural hearing loss. Psychomotor development was evaluated using the Children Development Scale (CDS) and the Psychomotor Development Evaluation Cards (PDEC). The three children were: Girl A (4 years 2 months 17 days) - a user of one CI, last assessment of psychomotor development (PDEC) was 37 months after CI activation; Boy B (4 years 3 months 21 days) - a user of two CIs, last assessment of psychomotor development (PDEC) was 39 months after activation of first CI; Boy C (4 years 1 month 5 days) - user of two CIs, last assessment of psychomotor development (PDEC) was 36 months after activation of the first CI.

RESULTS

Analysis of the results from Girl A showed very poor dynamics of development from the age of 12 months, when the first CDS evaluation was performed, up to the PDEC evaluation performed at age 4 years. The CDS score of Boy B showed a very high level of psychomotor development. The PDEC evaluation performed after 39 months of using the first CI showed that the psychomotor development of Boy B was consistent with his chronological age. Boy C presented an average level of psychomotor development (compared to typically developing children) in his CDS scores in the perioperative period and then at 4, 9, and 14 months after cochlear implantation. After 24 months, his CDS scores showed a high level of psychomotor development. After 3 years of CI use, the PDEC evaluation showed that Boy C had an average score in five tested areas, a high score in the area of fine motor skills and lateralization, and a low score in knowledge and learning competencies.

CONCLUSIONS

Children with bilateral profound hearing loss can present different paths of psychomotor development. Children who receive a CI may show an age-appropriate level of psychomotor development compared to typically developing children. However, a hearing, speech, and language rehabilitation specialist responsible for the child still needs to perform regular checkups to monitor all areas of psychomotor development. Also, the effects of the deaf child's environmental determinants on psychomotor development should be studied in detail. These determinants include the parents' emotional state, the parents' involvement in the child's rehabilitation, the family's quality of life, and the presence of deaf siblings. In particular, the difficulties encountered by the mother (or father) in being the parent of a deaf child may hinder the family from receiving adequate support.

Developmental outcomes of young deaf children and the self-perceived parental role of their hearing mothers

BACKGROUND

There is little research into the relationship between a deaf child's developmental outcomes and their mother's self-perceived parental role. The aim of this study was to find out whether the different levels of global psychomotor development in young deaf children who had a cochlear implant (CI), or were candidates for a CI, were related to particular family factors: the self-perceived parental role and the family quality of life (FQoL) as gauged by their hearing mothers, as well as the child's sociodemographic and deafness-related factors and the sociodemographic characteristics of the mothers.

METHODS

The study was conducted on a group of 64 children with bilateral severe or profound sensorineural hearing loss (SNHL) who were CI users (36 children) or qualified for cochlear implantation (28 children) and their hearing mothers. The age of the children ranged from 6.5 to 47 months (M = 23.6; SD = 10.1), among whom 55% were girls (n = 35). The mothers of the children were aged 24-48 years (M = 32.7; SD = 5.3). Information was collected via the Children Development Scale (CDS), the Self-Perception of Parental Role (S-PPR), the Family Quality of Life Survey (FQOLS-2006), and an additional information questionnaire which included questions about sociodemographic variables of the child and the mother, as well as questions related to deafness, the CI, and the child's rehabilitation.

RESULTS

Based on results of the CDS, the deaf children were divided into two groups: those who had a low level of global psychomotor development (Low global psychomotor development subgroup - LGPD) and others with medium or high scores (Medium/high global psychomotor development subgroup - MHGPD). The mothers of deaf children in the LGPD group assessed their investment in motherhood lower than did mothers from the MHGPD group. The mothers of the LGPD group rated their satisfaction with the child's rehabilitation lower than did mothers from the MHGPD group. The two subgroups did not differ in FQOLS-2006 domains except for community interactions, which were significantly higher in the MHGPD families.

CONCLUSIONS

Among the determinants of the global psychomotor development of a young deaf child, the most important ones relate to the use of a CI, but maternal investment in parenting is also important. Community interactions of the family with a deaf child are also crucial, as they create a framework for social network and support for the deaf child's optimal development. Any psychological diagnosis should include, apart from psychomotor development of the deaf child, an assessment of how the mother is coping with their parenting. Mothers of deaf children, especially those with LPGD, need additional support in parenting.

Neurodevelopmental Aspects and Cortical Auditory Maturation in Children with Cochlear Implants

Background and objectives: The cochlear implant is not only meant to restore auditory function, but it also has a series of benefits on the psychomotor development and on the maturation of central auditory pathways. In this study, with the help of neuropsychological tests and cortical auditory potentials (CAEPs), we intend to identify a series of instruments that allow us to monitor children with a cochlear implant, and later on, to admit them into an individualized rehabilitation program. Materials and methods: This is a longitudinal study containing 17 subjects (6 boys and 11 girls) diagnosed with congenital sensorineural hearing loss. The average age for cochlear implantation in our cohort is 22 months old. Each child was tested before the cochlear implantation, tested again 3 months after the implant, and then 6 months after the implant. To test the general development, we used the Denver Developmental Screening Test (DDST II). CAEPs were recorded to assess the maturation of central auditory pathways. Results: The results showed there was progress in both general development and language development, with a significant statistical difference between the overall DQ (developmental quotient) and language DQ before the cochlear implantation and three and six months later, respectively. Similarly, CAEP measurements revealed a decrease of positive-going component (P1) latency after cochlear implantation. Conclusion: CAEPs and neuropsychological tests prove to be useful instruments for monitoring the progress in patients with cochlear implants during the rehabilitation process.