High verbal working memory load impairs gesture-speech integration
Evidence from a dual task paradigm
While previous studies have shown the importance of visuo-spatial working memory in the processing of co-speech
iconic gestures, clear evidence for a potential involvement of the verbal working memory (vWM) is currently lacking. To address
this issue, participants in the present study were presented with a dual task paradigm. The main outcome variable was the
performance on a Stroop-like gesture task which provides a behavioural index of gesture-speech integration. Participants performed
this task under conditions of either high or low concurrent vWM load. Unlike in previous studies, the number of words to remember
in the high load condition was determined by their individual verbal span rather than being fixed. Results showed reaction time
costs in the form of longer reaction times for semantically incongruent gesture-speech combinations as compared to congruent
combinations. However, this semantic congruency effect disappeared when the vWM load increased. This result suggests a causal
involvement of verbal working memory capacity in gesture-speech integration.
Article outline
- Introduction
- Methods
- Participants
- Materials
- Digit Span task
- Dual-task paradigm
- Experimental design and statistical analysis
- Results
- Main analysis
- Gender Classification Task
- Secondary verbal working memory task
- Discussion
- Conclusion
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References