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17. A psychologist is studying the effects of orange juice on the prevention of colds. She has one group drink a glass of orange juice every day for the month of December. A second group drinks a glass of orange juice once a week during December, while a third group is not given any orange juice at all during this time period. Previous medical histories were obtained for all the participants. In January, she records how many colds each participant gets over the entire month. In this study, the independent variable is A) the severity of the colds in January B) the number of colds each participant got in January C) the prior medical histories D) drinking orange juice every day E) the amount of orange juice consumed
6. While interviewing Joe, Dr. Willard discovers that Joe has a genetic predisposition for schizophrenia because his uncle and mother had schizophrenia. Dr. Willard also believes the fact that Joe was homeless for several months after being expelled from school and "disowned by his parents triggered his schizophrenia. Dr. Willard probably follows the model of psychological disorders.
Critics of the trichromatic theory of colour vision have indicated that this theory has a major limitation. Which of the following statements MOST accurately reflects this limitation? A) Young and von Helmholtz were incorrect in assuming that cone photoreceptors in our retina are maximally responsive to a specific wavelength of light B) The trichromatic theory cannot explain the phenomenon of visual after-effects C) Rod photoreceptors in our retina, not cones, are responsible for the neural coding of colour D) Research has determined that there are actually six types of cones in the retina, rather than three as proposed by Young and Helmholtz E) Trichromatic theory cannot explain sensory adaptation
