A team of researchers at the Max Planck Institute for Psycholinguistics set out to investigate whether people who are blind gesture like sighted people when talking about the world, and how their unique perceptual experience might influence the way they express different kinds of concepts.
The study: Hands in Motion, Eyes Closed
In the first-of-its-kind study, blind and sighted participants were asked to perform two tasks. First, they heard a word - like “pen” or “bridge” - and had six seconds to use only gestures to represent it. Second, they listed features of the same words in writing. These tasks covered 60 concepts, including manipulable objects (e.g., pen, spoon), non-manipulable objects (e.g., bridge), and animals (e.g., lion).
By combining gesture and language tasks, the researchers aimed to understand whether language alone is enough to shape gesture use, or whether visual experience plays a key role.
Key findings: experience shapes expression
The study uncovered several compelling insights:
These findings suggest that while blind people possess conceptual knowledge comparable to sighted individuals, visual experience influences how this knowledge is expressed through gesture. In particular, concepts that rely heavily on seeing things from a distance are harder to represent without vision.
“This is the first study to show that blind people’s gestures are shaped by their lack of visual experience,” lead researcher Ezgi Mamus noted. “It reveals how communication strategies adapt when one sense is absent, and highlights the complex interplay between language, perception, and expression.”
The social implications are wide-reaching. By understanding how people with different perceptual experiences communicate, we can improve education, accessibility tools, and assistive technologies. This research also has potential applications in developing AI systems that generate or interpret gestures in more human-like ways, especially across diverse user populations.
Follow up
The team’s next step is to investigate how well blind people’s gestures are understood by sighted listeners. This will further clarify how gestures function as a bridge between thought and communication across sensory differences.
Cognitive Science
Experimental study
People
Gestural and Verbal Evidence of Conceptual Representation Differences in Blind and Sighted Individuals
13-Oct-2025
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