Nielsen neuro study finds second screens cause 25% of panelists to miss meter prompts

August 17, 2026 · mediapost.com

Twelve people-meter panelists took part in a Nielsen Consumer Neuro lab study using eye-tracking and biometric measurement to observe how solo viewing, co-viewing and second-screen use change engagement with programming and advertising. Seven of the panelists responded correctly when the meter prompted them with a light, five did not, and three of those five, 25% of the group, were looking at a second screen at the time. The study, 'The Mind of the Viewer,' was commissioned by the Council for Research Excellence and presented in New York by Nielsen's chief neuroscientist Carl Marci, who called the results preliminary and 'not conclusive' given the small sample. The research also found that attention to advertising rose from 15% in solo viewing to 20% in co-viewing, then dropped when a second screen was present.

National TV ratings depend on panelists pressing a button when prompted, and any gap in that compliance affects the currency agencies use to plan and buy campaigns. A pilot finding from 12 people is far from proof that measurement is broken, and Nielsen and the CRE have both cautioned against reading too much into it, but it flags second-screen behavior as a variable worth tracking as the CRE moves its research into natural and in-home settings. Media buyers who lean on Nielsen's national panel for reach and frequency numbers should watch for the next phase of results, due once the CRE tests viewing in more realistic conditions.