Not much of a shock, but definitely worth a look at:

Comscores most recent ad effectiveness study demonstrates display advertising significantly lifts online search activity. Consumers that were exposed to display advertising were more likely to search for brand terms and segment terms, than unexposed consumers.

The study underlined the direct impact display advertising has on both paid and organic searches, demonstrating the importance of digital display advertising on a brands direct response strategy.

Display Advertising Lift on Online Search Activity
Advertiser Category
% Search Lift (Brand & Segment)
Automotive 144%
CPG 22%
Health 260%
News & Media 144%
Personal Finance 206%
Property & Real Estate 125%
Retail 69%
Travel & Tourism 274%
Average Lift 155%