AI Overviews & Zero-Click Search

Brass-SEO cites this as the strongest independent measurement of AI Overview click loss. Pew Research analyzed 68,879 Google searches from 900 U.S. adults in March 2025 and found users clicked a traditional search result on 8% of visits when an AI summary was present, versus 15% when it was not — roughly half. Clicks on links inside the AI summary happened on just 1% of those visits. Users also ended their browsing session more often after a page with an AI summary, 26% versus 16%. Brass-SEO uses the 8-versus-15 figure as the baseline expectation for informational queries that trigger an AI Overview.

Examines:

Pew's analysis of 68,879 real Google searches measuring click-through with and without an AI summary present.

Brass-SEO draws on:

The 8%-versus-15% click-through finding — cited when Brass-SEO sets traffic expectations for queries that trigger AI Overviews.

Primary source

pewresearch.org — AI summaries and clicks

Brass-SEO uses this to establish how often AI Overviews actually appear, which sets the size of the exposure. Across 55,393 queries measured over 40 days, the researchers found AI Overviews activated on 13.7% of queries overall but on 64.7% of question-form queries. The gap matters for prioritization: informational and question-phrased queries are far more exposed to AI Overview click loss than navigational or transactional ones. Brass-SEO cites this to help users judge which of their pages sit in the high-exposure zone rather than assuming every query is affected.

Examines:

An empirical measurement of AI Overview activation rates across 55,393 queries — 13.7% overall and 64.7% for question-form queries.

Brass-SEO draws on:

The 13.7% overall and 64.7% question-query activation rates — cited when Brass-SEO helps users identify which pages face AI Overview exposure.

Primary source

arxiv.org/abs/2605.14021

Brass-SEO cites this as a clean causal estimate of AI Overview traffic loss on a real publisher. Using a difference-in-differences design across 161,382 matched article pairs — English Wikipedia, exposed to AI Overviews, against Hindi, Indonesian, Japanese, and Portuguese editions that were not — the authors estimate that AI Overview exposure reduced daily traffic to English articles by about 15%. The loss was largest for culture topics and smaller for STEM, tracking how fully the AI answer satisfies the query. Brass-SEO uses this to show the traffic effect is real and measurable, not only a change in click-through on the results page.

Examines:

A difference-in-differences study across 161,382 Wikipedia article pairs estimating the causal effect of AI Overview exposure on daily traffic.

Brass-SEO draws on:

The roughly 15% daily traffic decline on exposed pages — cited when Brass-SEO explains that AI Overviews cut real visits, not only result-page clicks.

Primary source

arxiv.org/abs/2602.18455

Brass-SEO monitors this for the ecosystem-level consequence of zero-click AI search. Across a 24,000-query study spanning 243 countries, the MIT authors document AI Overviews expanding from 7 to 229 countries between 2024 and 2025 and find that AI search surfaces significantly fewer long-tail sources and lower response variety than traditional search. Their concern is the downstream economics: if AI answers reduce the clicks that fund content, the incentive to produce new information weakens and source concentration rises. Brass-SEO cites this when explaining why the zero-click shift is a structural change to how content gets discovered and funded, not a passing dip.

Examines:

A 243-country study of AI search documenting AI Overview expansion and reduced source diversity, with implications for information-market economics.

Brass-SEO draws on:

The expansion and reduced-source-diversity findings — cited when Brass-SEO frames zero-click AI search as a structural shift in content discovery.

Primary source

arxiv.org/abs/2602.13415

Brass-SEO includes this as Google's official counter-position, so users get the whole picture. Google's documentation states that when people click from search results pages with AI Overviews, the clicks are higher quality, meaning users are more likely to spend more time on the site, and that there are no special requirements or optimizations needed to appear in AI Overviews or AI Mode. Google does not claim that per-page click volume held steady — its claim is about click quality. Brass-SEO presents this beside the independent measurements so users can weigh Google's quality argument against the volume losses others recorded.

Examines:

Google's official documentation on AI features — its claim that clicks from AI Overview pages are higher quality and that no special optimization is required.

Brass-SEO draws on:

Google's quality-of-click claim — cited by Brass-SEO as the vendor counter-narrative alongside independent traffic measurements.

Primary source

developers.google.com/search/docs/appearance/ai-features

Brass-SEO cites this for Google's aggregate-stability claim. Liz Reid, Google's head of Search, wrote that total organic click volume from Google Search to websites has been relatively stable year over year, and that average click quality rose, with Google sending slightly more quality clicks than a year earlier. This is a market-aggregate statement, not a per-site guarantee, and Google acknowledges the distribution of clicks shifted. Brass-SEO uses it to caution users that aggregate stability across the web does not protect any single site whose traffic depends on informational queries now answered inline.

Examines:

Google's position that total organic click volume has stayed relatively stable year over year while click quality rose.

Brass-SEO draws on:

The aggregate-stability claim and its market-level framing — cited when Brass-SEO separates web-wide averages from individual-site risk.

Primary source

blog.google — AI search and clicks