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Auditory language comprehension of temporally reversed speech signals in native and non-native speakers

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Kiss M., Cristescu T., Fink T., Wittmann M.

Acta Neurobiologiae Experimentalis

2008

vol. 68

issue 2

204-213

Neuropsychological studies in brain-injured patients with aphasia and children with specific language-learning deficits have shown the dependence of language comprehension on auditory processing abilities, i.e. the detection of temporal order. An impairment of temporal-order perception can be simulated by time reversing segments of the speech signal. In our study, we investigated how different lengths of time-reversed segments in speech influenced comprehension in ten native German speakers and ten participants who had acquired German as a second language. Results show that native speakers were still able to understand the distorted speech at segment lengths of 50 ms, whereas non-native speakers only could identify sentences with reversed intervals of 32 ms duration. These differences in performance can be interpreted by different levels of semantic and lexical proficiency. Our method of temporally-distorted speech offers a new approach to assess language skills that indirectly taps into lexical and semantic competence of non-native speakers.

The structure and dynamics of normal language processing: Insights from neuroimaging

75%

Heim S.

Acta Neurobiologiae Experimentalis

2005

vol. 65

issue 1

95-116

This paper reviews current psycholinguistic and neuroimaging evidence on language processing with particular focus on the relationship between production and comprehension. In the first part, different methods of psycholinguistic research are introduced and examples for psycholinguistic models (production: Levelt et al. 1999; comprehension: Friederici 2002) are sketched. In the second part, the neural correlates of semantic, phonological, and syntactic processing are reviewed. For semantics and phonology there seem to be different fronto-temporal networks which are shared in production and comprehension. The results for the processing of syntactic information are not entirely conclusive. Yet the data reveal that phonological strategies may be used in syntactic tasks. This finding opens the discussion of alternative, phonology-based strategies for language processing. Such strategies are accounted for by dual-route models featuring one direct and one indirect route which often involves phonological processing. This insight leads to some tentative conclusions about remediation strategies in dyslexics with selective (e.g., phonological) deficits.

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2 Acta Neurobiologiae Experimentalis

1 2008

1 2005

1 Cristescu T.

1 Fink T.

1 Heim S.

1 Kiss M.

1 Wittmann M.

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Auditory language comprehension of temporally reversed speech signals in native and non-native speakers

The structure and dynamics of normal language processing: Insights from neuroimaging