Buchanan, Tranel, and Kirchbaum (2009) Studied Three Groups of Participants

question 19

Multiple Choice

Buchanan, Tranel, and Kirchbaum (2009) studied three groups of participants, one of which had damage to the hippocampus, one that had similar brain damage but not to the hippocampus, and a control group of participants. The researchers assessed responses to the three groups both before and after they were exposed to stress. The hippocampus group showed a decrease in cortisol response to stress, whereas the other two groups shoed increases. Which of the following statistical tests was used to test the hypothesis?

• A) A main effect..
• B) A multiple regression.
• C) An interaction. d . A correlation.

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Definitions:

Quantitative Trait Locus (QTL)

Quantitative trait locus (QTL) is a stretch of DNA that is correlated with variation in a phenotypic trait. These regions contain genes, or are linked to genes, that contribute to population differences in a phenotype.

Phenotypic Trait

An observable and measurable characteristic of an organism, which can result from its genetic makeup and environmental influences.

DNA

DNA, or deoxyribonucleic acid, is a molecule that contains the instructions an organism needs to develop, live, and reproduce.

Population Differences

Variations in genetic makeup, traits, or behaviors among different groups within a species, often due to environmental factors or genetic drift.