In-feed ads are more memorable when a single clear change makes them instantly recognizable. Measuring recall in real viewing conditions means tracking which ads users pause on, rewatch, or mention later, similar to how engagement logs show what actually sticks. Patterns like repeated skips or fast scrolling act like heatmaps, revealing where attention drops and where curiosity peaks across different placements in the feed. Those insights guide designers to tighten the opening seconds, simplify messaging, and add memorable cues that trigger recognition even after scrolling away.