The __________ is the largest brain structure, accounting for 85 percent of the brain's weight

A negative reinforcer is a stimulus that ______, and a positive reinforcer is a stimulus that _______.

a. adds something pleasant; adds something unpleasant b. adds something unpleasant; adds something pleasant c. removes something unpleasant; adds something pleasant d. removes something unpleasant; removes something pleasant

A teacher informs his students that he is conducting a research study to improve his teaching

methods. He informs the students that he will pass out a teacher rating form during class time. Students are instructed not to put their names on the form and after completion of the task, he asks them to drop them in a box on the way out of class. After the last survey is dropped off, his teaching assistant takes the box, enters the data, and shreds the rating sheets. Although this teacher has addressed some important ethical guidelines, which of the following ethical issues remains most apparent or concerning? A) It is impossible to maintain confidentiality of the responses, the instructor could academically harm a student that provides a bad evaluation. B) The researcher did not properly outline the benefits of the study. C) The students were not provided compensation for their time, he should have offered extra credit. D) The students may feel compelled to take part in the study because they are his student; thus, their participation may not be voluntary.