__________ involves rewarding gradual changes in the direction of the ultimate goal

Which of the following is the most recent and accepted theory of colour vision?

a) The trichromatic theory, which states there are three different receptors, one for blue, one for green and one for red. b) The opponent-process theory, which also assumes that there are three different receptors: one for blue-yellow, one for red-green and one for black-white c) Dual-process theory, which takes part of Young-Helmholtz's theory (cone characteristics and function) and part of Hering's theory (cells in visual pathways alter firing dependent on wavelengths) and combines for one theory of colour transduction. d) We are still researching colour vision and what theory you follow depends on what theory you read first. There is no consensus.

One-year-old John clung to his mother and criedthe entire time that she talked to her

coworker in the mall. What was John demonstrating by his behavior? a. Separation anxiety b. Stranger anxiety c. Social referencing d. Anxiety disorder