Abstract
A PRP-paradigm was used to investigate the role of speech control in human information processing. Speech can be considered a highly complex, focal activity, which will occupy the central decision mechanism in the same way as external signals do. There is. however, some neurological evidence for speech control as a relatively independent process. In the experiment Ss had to perform a manual choice RT- task before, during, and after the articulatory stage of a naming response to an earlier stimulus. The results show that preparation of the speech reaction causes a clear delay of the processing of the second stimulus. This result is in line with Welford's Single Channel Model. However, during the execution of the articulatory process there is no evidence for delayed processing of a second stimulus. Our conclusion is that speech control does not occupy the same functional units of the human information system as external signals do.
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