Seeing and acting are more intertwined than once thought.

What is it about?

For decades, neuroscientists assumed that perception and action operate differently, with actions being resistant to visual illusions that distort perception. This study challenges that view by showing that eye movements are also influenced by the famous Müller-Lyer illusion, where arrows at the ends of lines make lines appear longer or shorter than they truly are. Crucially, the illusion’s impact weakens for both perception and eye movements when observers have more time to process the scene. These findings suggest that seeing and acting are not as independent as once thought, but instead rely on a shared internal representation of space that becomes more accurate with time.

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Photo by Edge2Edge Media on Unsplash

Photo by Edge2Edge Media on Unsplash

Why is it important?

This study challenges the long‑standing belief that perception and action process visual information differently, with action thought to be immune to contextual distortions in order to preserve precision. Although previous work had questioned this view, we provide conclusive evidence by ruling out the last major alternative explanation: that eye movements are merely attracted to an object’s center of gravity. By carefully controlling for this factor, our results show that visual illusions genuinely affect both perception and action. This demonstrates that the two are deeply intertwined, and that sensitivity to context may be an adaptive feature of human behavior rather than a flaw.

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