# The State of Streaming Has a Cognition Gap That's Already Repricing CTV Ads
> Viant's $40 million TVision acquisition moved cognition inside the DSP while every major viewing report still runs on reach.
- Publication: The State of Streaming
- Section: Measurement & Data
- Published: 2026-05-03T00:00:00.000Z
- Byline: The State of Streaming Staff
- Canonical URL: https://thestateofstreaming.com/measurement-data/2026/05/state-of-streaming-cognition-gap-conviva-ads/
- Read time: 6 min
## Summary
The state of streaming has a measurement split. Reach reports — Nielsen, Conviva, Comscore, Antenna — measure hours and share. The cognition layer that prices CTV ads now lives in DSPs and verification vendors on a separate cycle, anchored by Viant-TVision and the IAB-MRC November 2025 guidelines.

## Key facts

- The state of streaming's recurring quarterly reports — Nielsen Gauge, Comscore, Antenna, Conviva, Hub, and Parks Associates — collectively measure reach: hours, TV-share, subscriber transactions, and QoE telemetry. None carries a cognition or attention metric at the measurement level, a structural constraint of their panel designs.
- The cognition layer CTV buyers are pricing inventory against — Adelaide AU, TVision, Amplified Intelligence, IAS Authentic Attention, DV Authentic Attention, and Seedtag NeuroX — was assembled in parallel to the reach-based viewing reports, on a separate publication cycle tied to product shipments and DSP integrations, not quarterly viewing windows.
- Streaming reached 47.5% of total US TV viewing in December 2025, the highest share on record, per Nielsen's Gauge (January 2026) — a reach metric with no attention or cognition component, illustrating the state of streaming's measurement gap.
- Viant Technology (NASDAQ: DSP) agreed to acquire TVision for $40 million on April 15, 2026, pulling a major attention-measurement panel inside a DSP bid stack for the first time, per Viant's Form 8-K filed with the SEC on April 15, 2026.
- The IAB and MRC finalized v1.0 of the Attention Measurement Guidelines in November 2025, defining four methodological approaches and ratifying attention as a recognized measurement category — the first time a joint-industry framework codified cognition as a parallel (not replacement) metric alongside reach.
- Conviva, the original publisher of the State of Streaming report, pivoted that publication to the State of Digital Experience in late 2025, reframing around delivery telemetry and agentic AI, per Conviva's newsroom — the brand shift that left the recurring-viewing-report category without a cognition layer.
- IAS Total TV launched April 27, 2026, with Disney, NBCUniversal, Paramount, and Prime Video as named partners, providing show, program, genre, rating, and language signals through the IAS Signal UI — extending the cognition vendor stack into linear-adjacent CTV transparency (Integral Ad Science press release, April 27, 2026).


## Why it matters

The state of streaming's measurement vocabulary — the recurring quarterly volumes that quote hours, share, churn, and subscriber adds — is not the picture advertisers price CTV inventory against. The cognition layer that actually moves bid prices now lives inside DSPs and verification vendors operating on product-release calendars, not quarterly publishing cycles. The IAB/MRC Attention Measurement Guidelines (November 2025) ratified that split as a structural fact; the Viant–TVision deal (April 15, 2026, per Viant's SEC 8-K) deployed it inside a DSP bid stack. Buyers who read only the reach reports are working from an incomplete pricing picture.


## What to watch

- Viant–TVision acquisition close, expected Q2 2026 — the first look at how Viant publishes attention data once TVision sits inside the DSP bid stack, and whether it ships as a quarterly viewing report, a continuous product release, or a new format entirely.
- 2026 upfront pricing sheets from Disney, NBCUniversal, Paramount, WBD, Netflix, and Amazon — the first concrete test of whether attention-conditioned inventory carries quoted CPM premiums or stays in pilot-program language for another cycle.
- Next release cycles from Conviva, Comscore, Antenna, Hub, and Parks Associates — each publication's next volume will reveal whether any recurring viewing report adds an attention or cognition layer, or whether the panel structures remain anchored on reach by design.
- Joint Industry Committee currency-certification rubric update — the JIC's existing framework, built in 2023 to evaluate independent measurement vendors, was not designed to address DSP-owned cognition data; any revision post-Viant–TVision close will set the compliance baseline for attention-adjusted CPM at scale.

## Article
The recurring vocabulary the trade press has used to describe streaming for the last seven years — "the state of streaming" as shorthand for the quarterly volumes that quote hours, share, churn, and subscriber adds — is not the picture advertisers are pricing inventory against. Conviva's *[State of Streaming](https://www.conviva.ai/newsroom/)* report, the publication that put streaming-quality metrics on the trade map in 2018, was reframed last fall as the *State of Digital Experience*, anchored on delivery telemetry and agentic AI rather than streaming-specific reach. The Nielsen Gauge keeps publishing share-of-TV figures (47.5 percent to streaming in December, the highest on record). [Antenna](https://www.antenna.live/reports/q126-state-of-subscriptions-premium-svod-2025-year-in-review) keeps publishing churn and net adds (3.2 million net SVOD additions in Q1). [Comscore](https://www.comscore.com/Insights/Press-Releases/2025/10/Comscores-2025-State-of-Streaming-Report) (NASDAQ: SCOR) publishes hours and households (13.9 billion streaming hours, up 6 percent). What none of them measure, by panel design, is whether anyone in the room was looking at the screen when the ad ran.

The cognition layer arrived in parallel, on a different calendar. The [IAB and MRC finalized v1.0 of the Attention Measurement Guidelines](https://www.iab.com/wp-content/uploads/2025/11/IAB_MRC_Attention_Measurement_Guidelines_November_2025.pdf) in November, ratifying attention as a recognized measurement category. [OpenX integrated TVision's attention data pre-bid](https://www.emarketer.com/content/ctv-attention-measurement-integrated-advertising-auctions) into the programmatic bidstream this spring. Viant (NASDAQ: DSP) [agreed to buy TVision for $40 million](https://www.sec.gov/Archives/edgar/data/1828791/000182879126000029/dsp-20260414.htm) on April 15, pulling cognition data inside the DSP. The next generation of "state of streaming" reports either grows a cognition layer or gets supplanted by the vendor reports that already have one. Buyers will keep the recurring volumes for context. They will price inventory off the cognition data, and the cognition data is on a separate publication cycle entirely.

## What the recurring viewing reports actually measure

The reports are good at what they were built for. The mismatch is structural, not editorial. Walk the major recurring volumes across what they put on the page:

- **Conviva's *State of Streaming* report** (now extending into the *State of Digital Experience*) measures quality of experience: rebuffering, video startup time, video start failures, picture fidelity by bitrate threshold, concurrent streams, plays, viewing time. Per [Conviva's benchmarking page](https://www.conviva.ai/resource/benchmark-the-performance-of-every-stream/), the spine is delivery telemetry. There is no attentive-seconds component, no cognitive-availability layer.
- **The Nielsen Gauge** measures share of total TV usage by category (broadcast, cable, streaming) and by distributor. December 2025 set the record at 47.5 percent to streaming. The Gauge's [methodology pause earlier this spring](https://deadline.com/2026/03/nielsen-delays-streaming-viewing-report-to-april-after-complaints-1236761975/), which Peter Naylor described as "regret[ting]" the lack of impact data Nielsen provided in advance, was a controversy entirely contained inside the reach frame.
- **Antenna's *State of Subscriptions*** measures gross adds, cancels, net adds, churn, retention. Transactional metrics for a subscription business.
- **[Comscore's *State of Streaming*](https://www.comscore.com/Insights/Press-Releases/2025/10/Comscores-2025-State-of-Streaming-Report)** measures CTV households, streaming hours, FAST and AVOD growth, ad-tier penetration, services per household.
- **[Hub Entertainment Research](https://hubresearchllc.com/reports/)** measures ad-tier satisfaction, brand awareness, content discovery, value perception — all survey-based attitudinal data. Stated reception is not measured cognitive availability; the difference is the IAB/MRC framework's whole point.
- **[Parks Associates × Philo's "Unified Streaming"](https://www.prnewswire.com/news-releases/parks-associates-and-philo-aggregation-keeps-33-of-pay-tv-subscribers-engaged-302741704.html)** went further on advertising than the genre typically does: 51 percent of streaming subscribers interested in clicking ads, 49 percent interested in show-related shopping. It still anchored on stated interest, not eyes-on-screen.

Six recurring publications, six different reach-shape primitives. None carries a cognition or attention layer at the metric level. The panel structures aren't built for it.

<InlineChart
  src="/images/charts/state-of-streaming-cognition-gap-conviva-ads/inline-1.svg"
  alt="Side-by-side comparison of six recurring streaming viewing reports versus six cognition vendors. The viewing reports — Conviva's State of Streaming report, Nielsen Gauge, Antenna State of Subscriptions, Comscore State of Streaming, Hub Entertainment Research, and Parks Associates × Philo — each anchor on reach-family metrics: QoE telemetry, TV-share by category, subscriber transactions, hours and households, ad-reception survey, and stated ad interest respectively. The six cognition vendors — Adelaide AU, TVision, Amplified Intelligence, IAS Authentic Attention, DV Authentic Attention, and Seedtag NeuroX — each measure a form of cognitive or attentive engagement. A callout at the bottom of the viewing-reports column reads: No cognition layer in any of the six reports."
  caption="Two measurement streams running in parallel — what each stream measures, and what the other does not."
  dataSourceName="Individual vendor methodology pages; IAB/MRC Attention Measurement Guidelines v1.0 (November 2025)"
  dataSourceUrl="https://www.iab.com/guidelines/attention/"
/>

## What the cognition vendors built in parallel

A separate stack was assembled while the quarterly cadence held. [Adelaide Metrics](https://www.adelaidemetrics.com/) launched the Attention Unit (AU) as an alt-currency framework, a 0–100 omnichannel score trained on outcomes, with benchmarks spanning roughly 20 to 70 AU across formats. [TVision Insights](https://tvisioninsights.com/) built an in-home computer-vision panel measuring second-by-second, person-level eyes-on-screen across 24 billion seconds of TV viewing. [Amplified Intelligence's attentionTRACE](https://www.beet.tv/2024/12/reaching-for-the-attention-metrics-next-level-karen-nelson-field.html), built on Karen Nelson-Field's mental-availability research, established cross-screen attention thresholds: streaming TV captures roughly 9.7 active-attention seconds, about 8x mobile in like-for-like testing.

The verification incumbents followed. [IAS Authentic Attention](https://integralads.com/insider/) from Integral Ad Science (NASDAQ: IAS) probability-scores 50-plus exposure and engagement signals; [IAS Total TV](https://www.businesswire.com/news/home/20260427576783/en/IAS-Launches-IAS-Total-TV-Solutions-Giving-Marketers-Linear-like-Transparency-for-Connected-TV), launched last week with Disney, NBCUniversal, Paramount, and Prime Video as named partners, plugs into that infrastructure. [DV Authentic Attention](https://doubleverify.com/products/advertisers/verify/authentic-attention), DoubleVerify's (NYSE: DV) attention layer, is MRC-accredited on desktop and mobile and combines DV's exposure data with TVision's viewer-presence signals on CTV. [Seedtag's neuro-contextual layer](https://www.exchangewire.com/blog/2026/04/22/seedtag-revolutionises-media-planning-activation-with-the-launch-of-neurox/), validated through Columbia's Moran Cerf, hardened into NeuroX, a neuro-contextual exchange, last month.

The cadence is the diagnostic. Adelaide ships methodology pages, platform integrations, and outcome guides as continuous releases. TVision, Amplified, IAS, DV, and Seedtag publish on rolling cycles tied to product shipments and partnership announcements. None of them publishes anything called "the state of streaming." None of them is structured to. The cognition vendors are not in the recurring-viewing-report business; they are in the impression-pricing business, which runs on a different clock.

## Where the gap shows up where money lives

The two streams collide in the upfront. The IAB and MRC's [November guidelines](https://www.iab.com/guidelines/attention/) ratified four methodological approaches (data-signal-based measurement, visual and audio tracking, physiological and neurological observation, panel- and survey-based methods) and explicitly cautioned that "attention is not a standalone measure of ad effectiveness" and is "complementary data that works alongside delivery and outcome metrics." That nuance matters. The framework didn't replace reach. It put attention on the same shelf, with rigor.

What followed in the upfront cycle was a sequence of pricing moves. [OpenX integrated TVision's attention data](https://www.emarketer.com/content/ctv-attention-measurement-integrated-advertising-auctions) into pre-bid auctions in March, with Erika Loberg, OpenX's Global Head of CTV, calling it the moment advertisers can "activate attention as a targeting parameter at scale, in real time, and directly influence outcomes before the bid." [Viant's TVision deal](/measurement-data/2026/04/viant-tvision-attention-currency-acquisition/) on April 15 deployed the same logic inside a DSP, with Tim Vanderhook framing it: "Every advertising platform measures its own performance today, which makes it difficult for advertisers to understand what's actually working." The deal positioned what Viant called "attention-adjusted CPM" as the buy-side direction of travel.

The vendor consensus has been forming for months. Brian Gleason, CEO of Seedtag, articulated the frame in his own voice on LinkedIn earlier this spring:

  Beyond reach — think attention, intention, and emotional engagement as core performance metrics.

Scott Simonelli, the Veritonic founder and CEO whose company sits in audio measurement (not a CTV competitor), called the [Viant–TVision deal](https://www.linkedin.com/posts/scottsimonelli_ctv-measurement-adtech-activity-7450516448587862016-E1WU) "a real market signal" the day after it broke. "Measurement is no longer a recap slide at the end," he wrote. "It is becoming core infrastructure." Elizabeth Parks, the Parks Associates President and CMO who [framed the recurring research](https://www.prnewswire.com/news-releases/parks-associates-and-philo-aggregation-keeps-33-of-pay-tv-subscribers-engaged-302741704.html) on aggregation as strategic advantage, used vocabulary that exposes the gap rather than closes it: "consistent measurement and targeting capabilities." Consistent reach measurement, with the cognition layer absent.

The publications still describe the same market. They describe it on different time bases, with different metric primitives, for different audiences. The reach reports tell a CFO and a programmer where the audiences went. The cognition stack tells a buyer what an impression is worth, before the bid.

## What stays loose

The honest counterweight: cognition methodologies still vary across vendors. Adelaide's AU is a model output. TVision is a panel. Amplified is eye-tracking and attention research. Seedtag is neuro-contextual EEG and fMRI. IAS and DV blend exposure data with engagement signals. The IAB/MRC framework codified that the four approaches are different methods, not interchangeable inputs to the same metric. Attention-adjusted CPM is announced; it is not yet transacting at scale across the major ad-supported sellers. The recurring viewing reports remain useful for audience-share context, broadcast-vs-cable-vs-streaming category questions, ad-tier-mix tracking, and quarterly subscriber math — work the cognition vendors don't do.

The structural test runs through the rest of the upfront cycle and into Q2. The first read is the next release cycle of the recurring reports themselves. None of Conviva, Comscore, Antenna, Hub, or Parks Associates has announced an attention or cognition layer for their next volume; whether any of them does will say whether the panel structures can adapt or whether the gap stays where it is. The second read is the upfront pricing sheet. If 2026 materials from Disney, NBCUniversal, Paramount, WBD, Netflix, or Amazon surface attention-conditioned inventory with quoted CPM premiums, cognition has moved past the pilot-program register; if they don't, it hasn't. The third read is the Joint Industry Committee's currency-certification rubric, built in 2023 to evaluate independent measurement vendors and not built to evaluate DSP-owned cognition data post-Viant–TVision close. The original holder of the *State of Streaming* brand has already moved on. The recurring volumes that inherited it have not.

## Entities

- Companies: Nielsen, Comscore, Antenna, Integral Ad Science, DoubleVerify Holdings, Viant Technology, Adelaide Metrics, TVision Insights, Amplified Intelligence, Seedtag, OpenX, IAB Tech Lab, Media Rating Council, The Walt Disney Company, NBCUniversal, Paramount, Amazon, Veritonic
- People: Elizabeth Parks, Brian Gleason, Scott Simonelli, Tim Vanderhook, Yan Liu, Karen Nelson-Field, Erika Loberg, Angelina Eng, Ron Pinelli
- Products: Nielsen Gauge, Adelaide AU, IAS Authentic Attention, IAS Total TV, DV Authentic Attention, Seedtag Neuro-Contextual, IAB/MRC Attention Measurement Guidelines


## Tags

- state-of-streaming
- cognition-gap
- ctv-measurement
- attention
- viewing-reports
- upfront-2026
- viant
- tvision
- nielsen
- conviva
- ias
- doubleverify
- adelaide
- iab-mrc


## Sourced claims

- Streaming reached 47.5% of total US TV viewing in December 2025, the highest share on record, with the first 50%+ daily share occurring on December 13, 2025 (50.4%). — Nielsen Gauge — January 20, 2026: https://www.nielsen.com/news-center/2026/streaming-shatters-multiple-records-in-december-2025-with-47-5-of-tv-viewing-according-to-nielsens-the-gauge/
- The IAB and MRC finalized v1.0 of the Attention Measurement Guidelines in November 2025, defining four methodological approaches: data signal–based measurement, visual and audio tracking, physiological and neurological observation, and panel- or survey-based methods. — IAB / MRC Attention Measurement Guidelines v1.0 (November 2025): https://www.iab.com/wp-content/uploads/2025/11/IAB_MRC_Attention_Measurement_Guidelines_November_2025.pdf
- Viant Technology agreed to acquire TVision for $40 million ($22.5M cash + $17.5M Class A stock = 1,656,701 unregistered shares) on April 15, 2026, with expected close in Q2 2026. — Viant Technology — Form 8-K, April 15, 2026: https://www.sec.gov/Archives/edgar/data/1828791/000182879126000029/dsp-20260414.htm
- Conviva pivoted its annual publication from *State of Streaming* to *State of Digital Experience* in late 2025, with the December 2025 release reframed around digital experience monitoring and agentic AI rather than streaming-specific reach metrics. — Conviva newsroom: https://www.conviva.ai/newsroom/
- OpenX integrated TVision attention data pre-bid into the programmatic bidstream on March 12, 2026, with Erika Loberg, Global Head of CTV at OpenX, framing attention as 'a targeting parameter at scale, in real time' that 'directly influence outcomes before the bid.' — eMarketer — March 12, 2026: https://www.emarketer.com/content/ctv-attention-measurement-integrated-advertising-auctions
- Parks Associates released 'Unified Streaming: Unlocking Next-Gen Advertising' in partnership with Philo on April 14, 2026, finding 33% of pay-TV subscribers cite aggregation as their reason for subscribing and that the average US household subscribes to 5.3 streaming services across 300+ services in the US market. — Parks Associates × Philo — April 14, 2026: https://www.prnewswire.com/news-releases/parks-associates-and-philo-aggregation-keeps-33-of-pay-tv-subscribers-engaged-302741704.html
- Elizabeth Parks, President and CMO of Parks Associates, framed the research with: 'Aggregation is now a strategic advantage. Unified platforms simplify discovery, deepen engagement, and provide advertisers with more consistent measurement and targeting capabilities.' — Parks Associates × Philo press release: https://www.prnewswire.com/news-releases/parks-associates-and-philo-aggregation-keeps-33-of-pay-tv-subscribers-engaged-302741704.html
- Antenna observed 44.1M Gross Additions and 40.8M Cancels to Premium SVOD services in Q1 2026, resulting in 3.2M Net Additions for the quarter — transactional metrics with no attention or cognition layer. — Antenna Q1 2026 State of Subscriptions: https://www.antenna.live/reports/q126-state-of-subscriptions-premium-svod-2025-year-in-review
- Comscore's 2025 State of Streaming Report, released October 29, 2025, reported 96.4 million CTV streaming households, 13.9 billion total streaming hours (+6% YoY), Netflix ad-tier viewing reaching 45% of households (vs. 34% in 2024), and free ad-supported services up 43% YoY. — Comscore — October 29, 2025: https://www.comscore.com/Insights/Press-Releases/2025/10/Comscores-2025-State-of-Streaming-Report
- Adelaide's Attention Unit (AU) measures media quality on a 0–100 omnichannel scale via a machine-learning model trained to outcomes, with benchmarks spanning approximately 20 AU (lowest) to 70 AU (highest), available across Display, OLV, Social, CTV, Linear TV, Podcast, DOOH, Cinema, Terrestrial Radio, Streaming Audio, and Native. — Adelaide Metrics — AU methodology page: https://www.adelaidemetrics.com/
- TVision's panel-based attention measurement uses in-home computer-vision technology to capture second-by-second, person-level data on which individuals are in the room and whether they are paying attention to the TV, across a nationally representative panel that has measured 24 billion seconds of TV viewing. — TVision Insights — methodology: https://tvisioninsights.com/
- DoubleVerify's Authentic Attention metric on CTV combines DV's exposure data — viewable time, share of screen, video presentation, audibility — with TVision's viewer presence and eyes-on-screen attention signals, measuring more than 50 exposure and engagement data points in near real-time. — DoubleVerify — Authentic Attention product page: https://doubleverify.com/products/advertisers/verify/authentic-attention
- IAS launched IAS Total TV on April 27, 2026, with Disney, NBCUniversal, Paramount, and Prime Video as named partners, providing show, program, genre, rating, and language signals through the IAS Signal UI. — Integral Ad Science — Total TV launch, April 27, 2026: https://www.businesswire.com/news/home/20260427576783/en/IAS-Launches-IAS-Total-TV-Solutions-Giving-Marketers-Linear-like-Transparency-for-Connected-TV
- Brian Gleason, CEO of Seedtag, framed the cognition shift on LinkedIn on March 2, 2026: 'Beyond reach — think attention, intention, and emotional engagement as core performance metrics.' — Brian Gleason on LinkedIn — March 2, 2026: https://www.linkedin.com/posts/brian-gleason-307b934_why-neuro-contextual-ai-changes-how-marketers-activity-7434310228533424128-_T0j
- Seedtag launched NeuroX, a 'neuro-contextual exchange,' on April 22, 2026, making every Seedtag-network impression addressable via neuro-contextual targeting. — ExchangeWire — Seedtag NeuroX launch: https://www.exchangewire.com/blog/2026/04/22/seedtag-revolutionises-media-planning-activation-with-the-launch-of-neurox/
- Scott Simonelli, Founder & CEO of Veritonic, framed the Viant–TVision deal as 'a real market signal' on LinkedIn on April 16, 2026: 'measurement is no longer a recap slide at the end. It is becoming core infrastructure.' — Scott Simonelli on LinkedIn — April 16, 2026: https://www.linkedin.com/posts/scottsimonelli_ctv-measurement-adtech-activity-7450516448587862016-E1WU
- Tim Vanderhook, Viant CEO, said in the deal's announcement: 'Every advertising platform measures its own performance today, which makes it difficult for advertisers to understand what's actually working.' — Viant Technology — IR release, April 15, 2026: https://www.viantinc.com/company/news/press-releases/viant-announces-agreement-to-acquire-tvision-strengthening-its-ai-powered-programmatic-platform/
- Yan Liu, Co-founder & CEO of TVision, said: 'By joining Viant, we can bring our measurement capabilities together with real-time activation and AI-powered optimization.' — Viant Technology — IR release, April 15, 2026: https://www.viantinc.com/company/news/press-releases/viant-announces-agreement-to-acquire-tvision-strengthening-its-ai-powered-programmatic-platform/
- The IAB/MRC guidelines explicitly note that 'attention is not a standalone measure of ad effectiveness' and is 'complementary data that works alongside delivery and outcome metrics,' cautioning against treating attention as a currency or binary outcome. — IAB Attention Measurement landing page: https://www.iab.com/guidelines/attention/
- Hub Entertainment Research's TV Advertising: Fact vs. Fiction Wave 10, fielded November 2025 across 3,000 US consumers ages 14–74, found two-thirds of respondents would rather save money than avoid ads, and one-third subscribe only to ad-supported services. — Hub Entertainment Research — Wave 10: https://hubresearchllc.com/reports/
- Karen Nelson-Field's Amplified Intelligence published the first major cross-screen active-attention comparison through Nine in 2022, with research finding streaming-TV ads captured roughly 9.7 active-attention seconds — about 8x mobile, 16x desktop in like-for-like testing. — Beet.TV — Karen Nelson-Field cross-screen attention research: https://www.beet.tv/2024/12/reaching-for-the-attention-metrics-next-level-karen-nelson-field.html
- Six major recurring streaming viewing reports — Conviva, Nielsen Gauge, Antenna, Comscore, Hub Entertainment Research, and Parks Associates — each anchor on reach-family metrics (QoE telemetry, TV-share, subscriber transactions, hours and households, survey-based ad reception, or stated ad interest) with no cognition or attention layer at the metric level. Six parallel cognition vendors — Adelaide, TVision, Amplified Intelligence, IAS, DoubleVerify, and Seedtag — each measure a form of cognitive or attentive engagement (AU score, eyes-on-screen seconds, active attention seconds, 50+ exposure/engagement signals, viewer presence plus exposure, or neural engagement). — IAB/MRC Attention Measurement Guidelines v1.0 (November 2025); individual vendor methodology pages: https://www.iab.com/guidelines/attention/

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