To account for color vision, Helmholtz postulated the existence of:
a. three types of color receptors corresponding to three primary colors.
b. separate receptors for each wavelength in the visual spectrum.
c. one type of receptor that responded to all of the wavelengths in the visual spectrum.
d. receptors that process pairs of opposing colors.
a. three types of color receptors corresponding to three primary colors.
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In one study, rats licked frequently during infancy by their mothers were calmer than rats licked infrequently when faced with stress later in life. What is the most likely explanation for this?
a. The rat pups that were frequently licked learned to engage in the licking behavior as a coping strategy during times of stress. b. Because mothers who chose to lick their pups had a calmer demeanor, their pups were raised in less stressful environments. c. By licking their pups, these mothers had influenced the expression of genes that influenced responses to a stress hormone. d. The “licking” prone mothers only cared for the calmest pups of the litter, causing the more aggressive pups to die prematurely.
How do researchers and test developers identify systematic error in test scores?
a. Using analysis of variance b. Using correlation c. Constructing a confidence interval d. Calculating the standard error of measurement
A theory is defined as an organized set of concepts that explains a phenomenon or set of phenomena
a. true b. false
The first symptom of gonorrhea in a male is likely to be
A) severe swelling of lymph nodes under his arms. B) multiple painless sores on the scrotum. C) a small painful blister on his penis. D) a burning sensation during urination.