When a researcher asks the question, "Have subjects been pre-selected so as to represent the extremes on the variable of interest?" she is concerned with which one of the following potential threats to internal validity?
a. testing effect
b. maturation
c. subject selection
d. regression effect
d
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How is it possible for neurons in the central nervous system to reproduce or regenerate? What is this process called? Can anything help or hinder this process?
What will be an ideal response?
Research on the effectiveness of charisma training programs suggests that the programs
A. have long-term positive effects on charisma levels. B. cause higher levels of charisma. C. have no effect on charisma levels. D. are negatively correlated with levels of charisma.
Which of the following chemicals has research found increases during sleep and may lead to changes in dreaming throughout the night?
a) Cortisol b) Insulin c) Adrenaline d) Gamma-aminobutyric acid (GABA)
The sex drive is said to have no survival value for the individual; its only value is the survival of the _____
a. species c. culture b. society d. family