In order to get tested for dyslexia, a child holds his hand behind his back.
An adult touches phalanges with a brush (1-st or 3d phalanx of any finger, except for the thumb, so 8 possible variants) randomly.
The kid is to show the phalanx of which finger was touched using the thumb of another hand.
If the kid fails to give answers on more that 30 %, that means s/he is likely to have dyslexia, or dysgraphia. More than 30% of mistakes indicates a violation of hemispheric interaction.