Explain the theories that describe how people see color.
What will be an ideal response?
A synthesis of two theories explains how people sense color. The trichromatic theory of color vision, or the Young-Helmholtz theory, states that there are three types of visual receptors, each of which is most sensitive to a different wavelength of light. The combination of the information from these three receptors produces the sensation of color. The second theory is called the opponent-process theory of color vision and was developed by Hering. This theory states that the visual elements sensitive to color are grouped into three pairs and that the members of each pair oppose, or inhibit, each other. The three pairs are a red-green element, a blue-yellow element, and a black-white element. When one part of an opponent pair is no longer stimulated, the other is automatically activated. Both theories of color vision are correct to some extent, and the current approach is a synthesis of these two theories. Color vision is possible because three types of cones have different sensitivities to different wavelengths of light, just as the trichromatic theory proposes. The sensation of different colors results from stimulating the three types of cones in different ratios. The output from cones is fed into ganglion cells. The center and surround of the ganglion cells respond to different opponent colors and inhibit each other.
You might also like to view...
Buster runs an experiment in which she finds that participants placed in a good mood by a happy film clip are more likely to offer help to a fellow participant than participants who see a sad film clip. Bob suggests that perhaps this difference simply results from the fact that the participants in the happy film clip condition were more helpful people to begin with. What methodological aspect of
a successful experiment can Buster point to in order to refute this criticism? a. external validity b. random selection c. random assignment d. manipulation
Describe a developmental pathway for the course of somatic symptom disorder. Identify a point where intervention might be particularly effective and what type of interventions should be used
What will be an ideal response?
In therapy, a psychologist tries to convince a depressed woman that her actions do affect the environment and that even though uncontrollable events happened in the past, they need not happen again. This therapist is making use of principles from ____
a. psychodynamic theory c. the biogenic theory of depression b. learned helplessness theory d. the cognitive triad
A researcher uses archival records to investigate whether divorce rates in a city change following major catastrophes (e.g., hurricane, terrorism). This represents the use of
A. physical traces. B. qualitative data analysis. C. selective survival. D. natural treatments.