Because each form of iodopsin is most sensitive to light in roughly the red, green, or blue region, the three types of cones fire nerve impulses at different rates to produce various color sensations, according to which theory of color vision?
a. gate-control
b. opponent-process
c. primary stage
d. trichromatic
D
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A researcher who brings dating couples into the laboratory to be observed while they are solving a problem is most likely using ____
a. participant observation b. naturalistic observation c. contrived observation d. case study research
Which is NOT a necessary element of experimental research?
a. random assignment b. independent variable c. testing a real-world problem d. intervention
Seasonal affective disorder (SAD) seems to be related to __________.
A. low levels of thyroxine B. low levels of sunlight C. high levels of thyroxine D. high levels of sunlight
____ _____ death syndrome is a condition that occurs when infants stop breathing, usually during the night, and die.
Fill in the blank(s) with the appropriate word(s).