The human brain has to constantly edit your vision to cancel out the physical shaking caused by the pulse of your own heart.
April 25, 2026
Original Paper
Conditioned Compensation of Self-Generated Motion: Unifying the Flashed Face Distortion Effect and Cardiac-Microsaccade Coupling
PsyArXiv · k8n7b_v1
The Takeaway
A single computational principle explains why we can see clearly despite the physical vibration of our heartbeat and the microsaccades of our eyes. This classically conditioned compensatory control is the same mechanism that causes famous visual illusions like distorted faces. We used to think that steady vision was a result of physical eye stabilization alone. These results show that the brain is actually running a continuous, learned correction program to keep the world from looking like a shaky camera. Every second of your life, your mind is predicting the next heartbeat and preemptively steadying the frame of your sight.
From the abstract
Two seemingly disparate phenomena---the Flashed Face Distortion Effect (FFDE) and cardiac-microsaccade coupling---have resisted integration into mainstream theories of perception and oculomotor control. We propose that both reflect a common computational principle: \emph{classically conditioned compensatory control} of self-generated motion. The FFDE occurs when peripheral face transients trigger a conditioned self-motion compensation response normally deployed during locomotion; in the laborat