Regarding the criticism, we feel that it is not regarding flash cards themselves, but how it is used or handled. For example:
- Flash cards were used when the child clearly did not want to
- Too many / few flash cards were used
- Flash cards were not flashed quickly enough
- Parents showed irritation when the child could not focus
Please confirm whether these things were the cause. As to effects of using flash cards: the brain is stimulated when the pictures and words on the cards are visualized in high speed simultaneously with the words read out.