Classification of vowels and consonants by individuals with moderate mental retardation: development of arbitrary relations via match-to-sample training with compound stimuli.

Two teens with moderate intellectual disability learned to sort letters. The trainer used match-to-sample with compound cards. Each card showed a letter plus a color patch.

After linking cards to the spoken word 'vowel' or 'consonant', the teens were tested. They had to match new cards, say the category, and read short words. Checks ran again six weeks later.

Both students built five-member classes for vowels and consonants. They could group new letters, speak the right label, and use the skill to read simple words. The learning held for six weeks with no extra practice.

LeFrancois et al. (1993) first showed compound match-to-sample works with college students. Clarke et al. (1998) now proves the same trick works for teens with moderate ID and links it to real reading.

Farber et al. (2016) later extended the idea to children with autism. They added a tabletop sorting step before compound matching, giving teachers an even easier starting point.

Ayres-Pereira et al. (2025) updated the method further. They showed that placing look-alike choices side-by-side beats every other layout, giving a clearer guide when letters are hard to tell apart.

You can teach vowel and consonant categories in one short match-to-sample set. Use cards that pair each letter with a color or picture cue. Once the classes form, probe vocal labels and easy words right away. The skill stays put for at least a month, saving you re-teach time.