-
Uddannelse
Find uddannelse
Studievejledning
Besøg AU
Kvalitet
-
Forskning
Aktuel forskning
Talent
-
Samarbejde
Gymnasier
Myndigheder
Alumner
- Om AU
Dr. Sari Ylinen, Cognitive Brain Research Unit, Institute of Behavioural Sciences, University of Helsinki visits MIB.
21.04.2016 |
| Dato | man 13 jun |
| Tid | 11:00 — 12:00 |
| Sted | Meeting room 5th floor, Building 10g, Aarhus University Hospital, Nørrebrogade 44, Aarhus C |
Title:
Predictive coding in speech processing
Abstract:
The brain is constantly generating predictions of future sensory input to enable efficient adaptation. We used auditory event-related potentials (ERP) to study predictive coding in lexical and phonological processing. Firstly, we found that 12- and 24-month olds’ electrophysiological brain responses to heard syllables were faster and more robust when the preceding word context predicted the ending of a familiar word. For unfamiliar, novel word forms, however, word-expectancy violation generated a prediction error response, the strength of which significantly correlated with children’s vocabulary scores at 12 months. These results suggest that predictive coding may accelerate word recognition and support early learning of novel words, including not only the learning of heard word forms but also their mapping to meanings. Secondly, we aimed to determine whether the brain predicts the following segments of speech input on the basis of language-specific phonological rules that concern non-adjacent phonemes. The phonological rule of vowel harmony used in Finnish was expected to create predictions about phonologically legal pseudoword endings. Results showed that MMN responses were larger for phonologically illegal than legal pseudowords. This supports the hypothesis that speech input is evaluated against context-dependent phonological predictions. Taken together, the results support the hypothesis that predictions of future sensory input are automatically generated when listening to speech and that these predictions facilitate speech processing.