Harding test

The term Harding test is generically understood to mean an automatic test for photosensitive epilepsy (PSE) provocative image sequences in television content. This is properly known as a PSE test since the publication of the Digital Production Partnership (DPP) technical requirements and the DPP PSE Devices document (in the UK) in October 2013.

The Harding FPA (flash and pattern analyser) is proprietary software that is used to analyse video content for flashing and stationary patterns which may cause harm to those who suffer from photosensitive epilepsy. It is an implementation of the guidelines set by the regulator Ofcom in the UK. It is available in both tape-based and file-based versions, allowing video streams from SDI, composite, component, HDMI, and files to all be analysed, in resolutions up to 1080i. Versions for both Microsoft Windows and Apple Mac OS X are available. There are other manufacturers of similar and different solutions now available which are also approved on the DPP Devices list.

Photosensitive epilepsy affects approximately one in 4,000 people and is a form of epilepsy in which seizures are triggered by visual stimuli that form patterns in time or space, such as flashing lights, bold regular patterns, or regular moving patterns. In 1993, an advert for Pot Noodles induced seizures in three people in the United Kingdom, leading to the then regulator the ITC introducing these guidelines. Similarly, in Japan during 1997, an episode of the children's cartoon 'Pokémon', Dennō Senshi Porygon triggered over 650 admissions to hospital leading to the episode being banned from television worldwide. More recently, 18 viewers "reported ill effects" while watching a promotional film for the London 2012 Olympics.

The Broadcast Code of Advertising Practice requires that TV ads are tested and pass the 'flash test'. Clearcast, the company responsible for clearing ads for UK commercial broadcasters, is flash testing all ads before clearance.

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