It is illegal for television and film advertisements in Canada and the US to contain subliminal messages. The ban on such advertising goes back over 30 years.
The term "subliminal advertising" was coined to describe advertisements on television and in movie theatres that include extremely short duration text messages or images that are embedded into the advertisement to provoke a subconscious response from the consumer. Such messages are limited in duration by the refresh rate of television systems, but can be made much shorter with films by using a separate projector to flash extremely short duration messages.
The single test case that claimed to demonstrate the power of subliminal advertising was later exposed as a fraud, because the person performing the test falsified the results of the test. An audience at a theatre was exposed to very short duration messages flashed onto the screen, encouraging people to purchase certain food products.
The theory was that people would subconsciously absorb the content of these messages (e.g., "Buy Sudz, it's a great detergent") and respond by selecting the product in stores. Testing has never demonstrated any such correlation. However, the level of fear generated by the concept of subconscious persuasion was so high that subliminal advertisements were banned, even though they were rarely used, apart from testing audience reaction, and did not produce the desired results.
In a couple of episodes of a television series from the 80s ("The Young Ones"), the creators embedded very short duration images - a couple of frames - to have a little fun with their audience. The images were unrelated to the storyline and it was very obvious that something had been embedded in the video, because the screen would flicker momentarily. The images could be seen using slow-motion on a DVD player and they probably could have been seen using the pause on the VCR.
I bring this example up to demonstrate that subliminal advertising on television is difficult to achieve without the viewers noticing. A complete video frame requires 1/30s (NTSC) or 1/25s (PAL, SECAM) to display. If the message was embedded in a single field, it could be displayed in 1/60s (NTSC) or 1/50s (PAL, SECAM), but would be less visible. An individual frame containing an advertising message would be noticed by the viewer as a flicker on the screen - hardly subliminal. Although film uses a frame rate of 1/24s, a second projector would allow a message to be displayed for any period of time (e.g., 1/1000s).
Subliminal advertising can be accomplished in another way: by embedding images within the advertisement itself. An image can be embedded or suggested in several ways, including manipulating the shapes of items shown in the ad, placing images on reflecting surfaces (e.g., in a background mirror in the shot), or distorting the image by viewing it through another medium (e.g., ripples on the water surface, behind a frosted glass window, through an ice cube). Some peculiar people have claimed that several popular children's cartoons are full of 'suggestive' images intended to promote one or more (mythical) agendas of the producers.
Embedded advertising in the form of product placement has been used in film and television for decades. If the label on a bottle of Coca-Cola is visible, you can be sure that someone is paying for that exposure. Drinkers always order 'beer', but a brand name is rarely mentioned. Cars, clothing, drinks, food: all are embedded advertisements. On the other hand, products or their identifying labels might be obscured in some fashion to avoid displaying a company's trademark without paying rights to the trademark holder.
(Canadians will recognize the ubiquitous obscuring of products in the series "Trailer Park Boys". Some products are obscured because the producers did not pay to use the trademark on television. However, many items are obscured for the sake of a joke.)
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