The vowel card is used to help children who can’t discriminate the vowel sounds. Linda Mood, a Speech Pathologist, originally developed this concept.
The child places his hand under his chin and can feel the movement of the chin as the vowel is voiced. The vowels at the top of the chart have less movement than those on the bottom. Additionally, if the child places his hands flat on either side of his face below the ears he will be able to feel the bones move as the sound of letter e is voiced. Tis strategy really helps because many children can’t discriminate between the sounds of e, and I.