Is Seeing Gesture Necessary to Gesture Like a Native Speaker?

Area of Science:

• Linguistics
• Psychology
• Cognitive Science

Background:

• Gesture is a universal human behavior, but specific gestures vary across languages.
• The role of visual input versus linguistic input in acquiring language-specific gestures remains unclear.

Purpose of the Study:

• To investigate whether learning to speak a language or observing gestures is sufficient for producing language-specific gestures.
• To determine if auditory linguistic input alone can shape gestural patterns.

Main Methods:

• Studied congenitally blind and sighted adult native speakers of English and Turkish (n=40 per language).
• Compared speech and gestures, focusing on descriptions of physical motion.
• Included sighted participants wearing blindfolds to control for visual input.

Main Results:

• Congenitally blind speakers produced speech patterns similar to sighted native speakers.
• Crucially, blind speakers' gestures mirrored those of sighted speakers of the same language.
• Gestures of blindfolded sighted speakers also aligned with non-blindfolded speakers of their language.

Conclusions:

• Auditory exposure to a specific language is sufficient for acquiring its associated gestures.
• Visual experience is not necessary for learning and producing language-specific gestures.
• This highlights the strong link between spoken language and gestural patterns.