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A major limitation of the experimental method is that ethical considerations can prohibit researchers from investigating many important psychological questions. If manipulating a variable could cause harm or distress, an experiment cannot be ethically conducted, forcing researchers to use other methods.

Ethical Constraints in Experimental Research

An example of an ethically impermissible experiment is one designed to determine if childhood abuse causes lower self-esteem in adults. Such a study is unethical because it would require the researchers to randomly assign participants to a group that is intentionally subjected to abuse, which involves deliberately causing severe harm.

Example of an Unethical Experiment: Child Abuse and Self-Esteem

While the majority of contemporary psychological research relies on human participants, a significant minority involves nonhuman animal subjects. This practice is especially prevalent in fields such as the study of learning and conditioning, behavioral neuroscience, and the development of surgical or drug therapies for psychological disorders.

Nonhuman Animal Subjects in Research

A psychologist proposes an experiment to investigate the causal link between prolonged social isolation and the development of depression. The plan involves randomly assigning healthy adult participants to one of two groups: one group will live in a controlled, isolated environment for three months, while the other group will continue their normal social lives. From an ethical standpoint, what is the primary reason this experimental method is unacceptable?

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