Cognitive control during selection and repair in word production

Area of Science:

• Psycholinguistics
• Cognitive Psychology
• Speech Production Research

Background:

• Word production involves sequential selection of lexical items and their phonetic segments.
• Control processes manage both selection and error monitoring/correction during speech.
• Understanding the locus and specificity of these control mechanisms is crucial.

Purpose of the Study:

• To investigate the control processes governing lexical and segmental selection (selection control).
• To examine the control processes involved in intercepting and correcting errors (post-monitoring control).
• To determine if selection control and post-monitoring control are stage-specific or shared.

Main Methods:

• Two experiments manipulated semantic and segmental overlap between repeatedly named objects to study selection control.
• Participants performed a reversal task with semantically- or segmentally-related object names to study post-monitoring control.
• Costs associated with contextual similarity and reversal were measured, and individual differences were analyzed.

Main Results:

• Both contextual similarity and reversal tasks incurred significant costs, independent of each other.
• Individual differences showed no correlation for selection control costs across semantic and segmental similarity.
• Individual differences revealed a reliable correlation for reversal costs across semantic and segmental relatedness.

Conclusions:

• Selection control processes appear to be stage-specific, operating independently at lexical and segmental levels.
• Post-monitoring control, however, seems to involve a shared mechanism applicable to both semantic and segmental errors.
• These findings support a model differentiating control mechanisms across distinct stages of word production.