Brain tumor . Depending on where it is, it can cause different types of hallucinations. If it's in an area that has to do with vision, you may see things that aren't real. You might also see spots or shapes of light. Tumors in some parts of the brain can cause hallucinations of smell and taste.
The second major variable of interest to researchers is the dependent variable. The dependent variable (so called because its value depends on which level of the independent variable the subject received) is the response to the independent variable. In Dr. Harvey's research study, the dependent variable is the way that people are treated in the workplace. Dr.
Independent and dependent variables are the variables that change  during the course of an experiment. An example might be an  experiment on how temperature affects plant gr â¦ owth. Changing the  temperature is the independent variable, while the level of plant  growth that results is the dependent variable.