When researchers use existing data to create groups for comparison, the approach is known as

People who have a nervous system that has greater inhibitory processes are likely to be introverts

Indicate whether the statement is true or false.

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.