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A researcher tested a group of students first time in second grade and the second time in the middle of the third grade. The second test indicated significant improvement, but after reviewing the test scores the researcher became concerned that he could not be sure whether the scores were a result of the treatment or a result of the students' having gained more life experience in a year-and-a-half. What threat to internal validity is this researcher worried about?
Parasympathetic System
A division of the autonomic nervous system responsible for relaxation and conserving energy.
Medical Consultation
A professional meeting between a patient and a healthcare provider to diagnose health issues and discuss treatment options.
Intruding Thoughts
Unwanted, involuntary thoughts, images, or impulses that can be distressing or disturbing to the individual.
Attitudinal Foundation
The underlying beliefs and values that shape an individual's attitudes and behaviors.
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