Suchergebnisse

When children start formal education, they are expected to be able to express complex thoughts. However, in order to do so, they need to be able to use both complex grammatical structures and a variety of words. One group that is at risk of having a delay in terms of their expressive language ability is children with cochlear implants (CI). In this study, we evaluated whether children with CI perform comparably to children with typical hearing (TH) on a standard expressive spoken grammar and a standard expressive spoken vocabulary task when the groups were matched on non-verbal intelligence and working memory capacity. It was found that the children with CI in this study performed more poorly on a standard expressive spoken vocabulary task but not on a standard expressive spoken grammar task when compared to the children with TH. Differences in terms of expressive spoken vocabulary do not seem to be explained by differences in cognitive ability. In addition, the variation in terms of expressive spoken language ability was larger in the children with CI compared to the children with TH. This might be explained by additional confounding factors, like the time of language deprivation or by a greater influence of cognitive differences for the acquisition of spoken language for children with CI. ; Ytterligare forskningsfinansiär: European Union Seventh Framework Program (FP7/2007–2013) under Grant Agreement FP7-607139 (iCARE)

Objective Theory of mind (ToM) refers to the ability to impute mental states to one's self and others. ToM was investigated in adults with Usher syndrome type 2 (USH2) or Alström syndrome (AS). Both syndromes cause deafblindness, but differ with regard to onset and degree of sensory loss. Individuals with AS, furthermore, display additional physical diseases. Comparisons were made with individuals with typical hearing and vision. Methods Thirteen people with USH2, 12 people with AS, and 33 people with typical hearing and vision performed tests of working memory capacity and verbal ability. ToM was tested via Happé's Strange Stories, assessing ability to understand the emotions and actions of story characters. The test also included matched physical stories to evaluate understanding of the logical outcomes associated with everyday situations. Results Significant differences were identified in problem solving regarding physical conditions, with higher scores for the typical hearing and vision group, H(2) = 22.91, p < 0.01. The two groups with deafblindness also demonstrated poorer ToM than the typical hearing and vision group, H(2) = 21.61, p < 0.01, and the USH2 group outperformed the AS group, U(34), z = 2.42, p = 0.016. Intra-group variability was related to working memory capacity, verbal ability, visual status, and to a minor extent auditory capacity. The prevalence of the additional physical diseases was not related to ToM performance. Conclusions Limited access to information due to visual loss may have reduced the degree of social experience, thereby negatively affecting the development of ToM. That working memory capacity and verbal ability displayed an impact implies that hearing also contributes to ToM development. Differences between the two groups might be a function of genetic conditions, in which the gene causing USH2 only affects the ears and the eyes, whereas AS has a multisystemic pathology. Implications for practitioners Advice and support technology should emphasize ease of communication and boost the development of the communication required to develop ToM.

Listening to speech in noise is effortful, particularly for people with hearing impairment. While it is known that effort is related to a complex interplay between bottom-up and top-down processes, the cognitive and neurophysiological mechanisms contributing to effortful listening remain unknown. Therefore, a reliable physiological measure to assess effort remains elusive. This study aimed to determine whether pupil dilation and alpha power change, two physiological measures suggested to index listening effort, assess similar processes. Listening effort was manipulated by parametrically varying spectral resolution (16- and 6-channel noise vocoding) and speech reception thresholds (SRT; 50% and 80%) while 19 young, normal-hearing adults performed a speech recognition task in noise. Results of off-line sentence scoring showed discrepancies between the target SRTs and the true performance obtained during the speech recognition task. For example, in the SRT80% condition, participants scored an average of 64.7%. Participants true performance levels were therefore used for subsequent statistical modelling. Results showed that both measures appeared to be sensitive to changes in spectral resolution (channel vocoding), while pupil dilation only was also significantly related to their true performance levels (%) and task accuracy (i.e., whether the response was correctly or partially recalled). The two measures were not correlated, suggesting they each may reflect different cognitive processes involved in listening effort. This combination of findings contributes to a growing body of research aiming to develop an objective measure of listening effort. ; Funding Agencies|Australian Hearing Hub, an initiative of Macquarie University; Australian Government; Business Cooperative Research Centres Programme of the Australian Government