According to the trichromatic (Young-Helmholtz) theory, what causes perception of green?
a. The activity of cones is greatest at a point between the fovea and the periphery.
b. Most of the cones are firing at an intermediate frequency
c. The medium-wavelength cones are more active than the other ones.
d. The velocity of action potentials from the retina is at an intermediate level.
Answer: c. The medium-wavelength cones are more active than the other ones.
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The EEG tracing of the patient in the sleep laboratory shows that brain waves have slowed to about 1 to 2 cycles per second. In addition, breathing and heart rate have decreased. It is most likely that the patient is
a. in stage 1 non-REM sleep. b. experiencing feelings of anxiety. c. in stages 3 and 4 of sleep. d. in paradoxical sleep.
The preoperational thought stage occurs when
a. infants become toddlers. b. children learn a language. c. children can understand abstract concepts. d. children become adolescents.