Neuromuscular blocking drugs (NMD) are paralyzing medications that are often used during surgery to relax the body and make it easier for the surgeon to perform the surgery and the anesthesiologist to insert the breathing tube (called intubation). Facial muscles are resistant to NMD effects, but they might affect the EMG reading, making the CVI less useful when a patient needs NMD. The M-entropy monitor (GE Healthcare, Helsinki, Finland) is similar to the BIS monitor with CVI and is affected by large NMD doses. The purpose of this study is to examine the effect of rocuronium, a NMD, on the response of CVI and M-entropy to laryngoscopy under anesthesia. A laryngoscopy is the standard way of examining and opening the patient's airway before inserting the breathing tube. It is fairly stimulating so anesthesiologists sometimes, but not always, administer a NMD (in varying doses) before performing the laryngoscopy in standard care.