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16th International Science of Aphasia Conference, Stem-, Spraak- en Taalpathologie, University Groeningen.
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Scientific Report.
Every speaker has experienced that language production usually proceeds effortless, but that some conditions interfere with fluent speech planning. For instance, speaking while doing another task demanding some attentional control (eg. driving) or producing a tongue twister (eg. “Six sick hicks nick six slick bricks with picks and sticks”) represent typical contextual and linguistic conditions that enhance the difficulty of speech planning and production. These interfering conditions have a particular detrimental effect on speech production in brain-damaged language impaired (aphasic) speakers, who very often complain that their performance gets worse with co-occurring cognitive tasks or simply with environmental noise. By contrast, specific facilitation conditions are extensively used in speech and language therapy to restore language production in aphasic patients. However, facilitating strategies and contexts do not influence all aphasic patients in the same way and all aphasic speakers are not equally affected by interference. In the present project we seek to understand how some specific linguistic and contextual conditions facilitate or interfere with language production in healthy speakers and in brain-damaged aphasic speakers. To get insight into the dynamics of interference and facilitation in healthy adult speakers, in sub-project A we will run a series of event-related potential (ERP) studies analyzing which speech planning processes are modulated by specific interfering or facilitating conditions. In sub-project B we will then run the same studies with aphasic patients to investigate which behavioral and electrophysiological patterns underlie inter-individual differences in the sensitivity to interference and to facilitation. Understanding the mechanisms underlying facilitation and interference during speech planning and execution in normal conditions and in aphasia should enable to formulate new hypotheses on approaches to aphasia therapy aimed at reducing sensitivity to interference and at optimizing transfer of improvements from clinical settings to real life situations where interference is much more present.