There is a wide range of subliminal products available and they are easy to use. All the individual needs to do is sit back and relax, switch on the relevant device (e.g. audio cassette/CD/DVD) and he will be presented with a variety of relaxing sounds and/or images. However, according to the distributors of such products, hidden behind these relaxing platitudes are messages aimed at stimulating the individual to change his behaviour. Advocates of these products claim that the hidden or subliminal messages have the power to modify a range of behaviours, including stopping smoking and stress reduction, as well as improving such abilities as reading comprehension, exam performance, memory, and even psychic abilities, to name but a few.