Question

question 20 (4 points)
a psychophysicist would be most directly concerned with
our psychological reactions to physical stress
the effects of heredity on teh endocrine system
the effect of neurotransmitters on depression
the relationship between the wavelength of light and the experience of color
question 21 (4 points)
when most people stare first at a blue circle and then shift their eyes to a white surface, the after image of the circle appears
yellow
red
green
blue

Explanation:

• Question 20: Psychophysics is the study of the relationship between physical stimuli (such as the wavelength of light) and the psychological experiences (such as the experience of color) they produce. The other options are related to other areas of study (e.g., stress - related psychological reactions might be in general psychology, heredity and endocrine - biology, neurotransmitters and depression - neuroscience/psychiatry).
• Question 21: According to the opponent - process theory of color vision, when we stare at a color (e.g., blue), the receptors for that color get fatigued. When we then look at a white surface (which contains all colors), the opponent color (yellow, since blue and yellow are opponent colors in this theory) is seen as an after - image.

Answer:

• Question 20: The relationship between the wavelength of light and the experience of color
• Question 21: Yellow