The worth of human beings is much more than animals. So scientists and researchers should also be careful about who they apply their experiments and researches on initially.
On the other hand, animals and human beings may not react the same way when technologies are applied to their brains. So this is a delicate issue, and the cases should be handled with care and safety measures. Summing up, these are the pros and cons of the topic issue, And these are the questions that will pop up when the attempts will be made.