The psychodynamic perspective places a major emphasis on unconscious drives, motives, conflicts, and childhood experiences.
The biological perspective deals with the genetic and biological processes in the brain or other parts of the nervous system that could lead to changes in behavior, psychological problems, or mental processes.
The cognitive perspective deals with how thoughts and interpretations affect how we respond in certain situations.
IV – Exposure to testosterone.
DV – Aggressive behavior.
Control Group – Female rats on placebo.
IV – Drug.
DV – Number of children whose ability to pay attention increases.
Control Group – Children on placebo.
An experiment isolates and manipulates the independent variables to observe its effect on the dependent variable, while also controlling the environment so extraneous variables may be eliminated or held constant across experimental and control groups. While correlational research only identifies variables and looks for a relationship between them. This means that an experiment can determine cause an effect, but correlational research can only predict a relationship, and point to possible causation, because of the extraneous variables that may be involved and not known about.
In a single blind procedure, only the experimenter knows who is in the control group versus the experimental group, while in a double blind procedure, neither the experimenter nor the participants know who is in which group.