Keenan et al. (2001) used anesthesia to investigate which brain hemisphere is involved in self-recognition. Ten subjects were randomly assigned to two groups. The left hemisphere was anesthetized in one group, whereas the right hemisphere was anesthetized in the other group. Each subject was then shown a picture generated by averaging (“morphing”) images of the face of a famous celebrity (e.g., Marilyn Monroe) and their own face, and told to remember the picture. After recovery from anesthesia, patients were presented with two pictures and asked to choose the one they had been shown earlier while under anesthesia. The two pictures were the original two images from which the morphed image had been generated (i.e., “self” and “celebrity,” but separate this time). All five patients whose left hemisphere had been inactivated chose the picture of self. Four of the five patients whose right hemisphere had been anesthetized chose the celebrity picture instead (the fifth chose self). State what test you would use to determine whether the treatment (left vs. right hemisphere anesthesia) influenced recognition of self-versus celebrity. Explain why you would choose this test (don’t carry out the test, just name it and justify your answer).