SGS Research Showcase | High-level processing at play in Ponzo size illusions

Ecem Altan | Linktree

Launch Demo

Welcome to our interactive demo! 
Please Note: This demo is not compatible with iOS devices.

Here’s how to get started:

START THE DEMO: Click on the “Start Experiment” button to begin.

ADJUST SIZE: Use the slider to resize the image of the car so that it matches the size of the car on the road.

CONFIRM YOUR ADJUSTMENT: Once you matched the sizes, confirm your adjustment by clicking the green check mark button.

COMPLETE ALL TASKS: Repeat these steps for all four tasks. After the final task, you can choose to either refine your results with additional adjustments or conclude the experiment.

VIEW YOUR RESULTS: To finish, click on the “End Experiment” button at the top of the page. You will then see an upside-down car, an upright car, and two red outlines around them. These outlines represent how you perceived the size of the cars in comparison to their actual size.

Dive in and see how accurately you can perceive sizes in different orientations. Enjoy exploring your perception!

How Do You Perceive the Illusion? Find Out Now!

Abstract

Illusory size perception is usually an outcome of complex processing that incorporates the object and its spatial context. The primary visual cortex (V1) has been found to reflect illusory perception; however, the stage of processing leading to this outcome is not fully understood. To test the involvement of higher-level processing in a Ponzo-like size illusion, we measured the illusion magnitude in upright and inverted conditions, and with altered versions containing various amounts of depth cues. The results showed weaker illusion for inverted conditions compared to the upright ones, and weaker effects as the depth cues decreased. Moreover, using functional MRI, we found that the extent of neuronal activation in V1 was smaller in the inverted version in line with perceived size. Our findings suggest that the perceived size bias is linked to visual experience and expectations, indicating the involvement of a feedback mechanism from high-level stages of visual processing.

Read Abstract

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Ecem Altan

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Ecem Altan

SGS Research Showcase | High-level processing at play in Ponzo size illusions

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