Review the fourth paragraph 4 Despite the positive results seen so far, some will point to the fact that research on mindfulness training for students is still limited. Indeed, much of the research on mindfulness has focused on adults not children. Critics also point out that much of the current research is not rigorous enough and that more careful studies need to be done. Associate Professor Tamar Mendelson of the Johns Hopkins Bloomberg School of Public Health agrees that research on meditation in children is still in its early stages. However, even she says that she has seen the positive impact of meditation on children. Others express concern that meditation is not a valuable use of class time;they belleve that "stillness" amounts to wasted time in school. But many people disagree. Denise Pope, a senior lecturer at the Stanford University Graduate School of Education, stated "This is something teachers can do immediately. In the fourth paragraph , what opposing claim does the author address? The author acknowledges that research supporting the benefits of meditation in children may be lacking. The author admits that mindfulness training programs are too costly an investment for schools. The author notes an argument that those who support meditation programs in schools are not thinking clearly.