In conclusion, our findings suggest that listeners reallocate their attention and focus more strongly on non-verbal information form co-speech gestures if speech comprehension becomes challenging due to the speaker's verbal production deficits.
That is gestures produced by speakers with less informative speech were attended to more frequently. Further, the amount of information in speech was also correlated with gesture attention. This effect was significant even when we controlled for the longer duration of the gestural movements in speakers with aphasia.
Our results show that hand gestures produced by speakers with aphasia are on average attended to longer than gestures produced by non-brain damaged speakers.
These video clips featured speakers with aphasia and non-brain damaged speakers describing two different scenarios (buying a sweater or having witnessed an accident). Healthy volunteers (observers) watched short video clips while their eye movements were recorded. In the present study, we addressed the question whether these gestures catch the attention of their addressees. Furthermore, there is evidence to suggest that speakers with aphasia produce gestures that convey information essential to understand their communication. In fact, speakers with aphasia produce more gestures than non-brain damaged speakers. Hand gestures may become more relevant when verbal production is impaired, as in speakers with post-stroke aphasia. Co-speech hand gestures are a ubiquitous form of nonverbal communication, which can express additional information that is not present in speech.
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