Dr. Corpus is studying patients who have all suffered from severe epilepsy and performs split-brain surgery on half of them: split-brain patients who are all right-handed and patients who have not had split-brain surgery (who are also right handed). She would like to further study the findings of those like the "Hatband" study (discussed in your textbook) by flashing on a screen one word "hat" to the left visual field only and another word, "band," to the right visual field only. Then the participants are asked, "what did you see?" Participants are asked to write down what they saw (with their right hand) and point to what they saw with their left hand. What is the independent variable(IV) and dependent variables (DVs) in this study?