28. A method for testing speech intelligibility, comprising the steps of: producing a plurality of stimulus words with a sound device to be heard by a test subject, each of said plurality of stimulus words comprising a plurality of speech sounds; displaying to said test subject a set of selectable word pairs corresponding to a set of contrasting speech sounds whenever a stimulus word is transmitted to said test subject, said set of contrasting speech sounds comprising consonant contrasts and vowel contrasts, a first word of said word pair corresponding to said stimulus word, and a second word of said word pair differing from said first word by at least one of said set of contrasting speech sounds, each said word comprising a real word; and selecting, by said test subject, either word of said word pair upon deciding which of said two words was heard.
28. A method for testing speech intelligibility, comprising the steps of: producing a plurality of stimulus words with a sound device to be heard by a test subject, each of said plurality of stimulus words comprising a plurality of speech sounds; displaying to said test subject a set of selectable word pairs corresponding to a set of contrasting speech sounds whenever a stimulus word is transmitted to said test subject, said set of contrasting speech sounds comprising consonant contrasts and vowel contrasts, a first word of said word pair corresponding to said stimulus word, and a second word of said word pair differing from said first word by at least one of said set of contrasting speech sounds, each said word comprising a real word; and selecting, by said test subject, either word of said word pair upon deciding which of said two words was heard. 33. The method according to claim 28, wherein said consonant contrasts comprise a pair of consonant speech sounds, wherein each of an approximant speech sound is paired with all other approximant speech sounds.