Question

1. according to the young - helmholtz theory

a) the size of the difference threshold is proportional to the intensity of the stimulus.
b) the optic nerve processes top - down stimuli.
c) certain nerve cells in the brain respond to specific features of a stimulus.
d) color vision depends on pairs of opposing retinal processes.
e) the retina contains three kinds of color receptors.

1. the ability to simultaneously recognize the color, shape, size, and speed of an oncoming

automobile best illustrates
a) kinesthesis.
b) parallel processing.
c) blindsight.
d) sensory interaction.
e) subliminal perception.

1. which neural center in the limbic system plays a central role in emotions such as

aggression and fear?
a) thalamus
b) dendrite
c) medulla
d) amygdala
e) cerebellum

1. thinking about sex (in your brains cerebral cortex) can stimulate a region of the limbic

system to secrete hormones. these hormones trigger the pituitary gland to influence
hormones released by other glands in the body. which brain region influences the
endocrine system?
a) hypothalamus
b) thalamus
c) hippocampus
d) amygdala
e) reticular formation

1. alcohol, marijuana, cocaine, and a wide variety of other chemical agents that alter

perceptions and moods are called
a) narcotic agents.
b) psychoactive drugs.
c) physiological dependents.
d) stimulants.
e) hallucinogens.

Explanation:

1. The Young - Helmholtz theory (trichromatic theory) states that the retina contains three kinds of color receptors (cones) sensitive to red, green, or blue.
2. Parallel processing is the ability to simultaneously process multiple aspects of a stimulus, like color, shape, size, and speed of an object.
3. The amygdala is a part of the limbic system that plays a central role in emotions such as aggression and fear.
4. The hypothalamus influences the endocrine system. It can stimulate the pituitary gland which in turn influences other glands.
5. Psychoactive drugs are chemical agents that alter perceptions and moods. Alcohol, marijuana, cocaine are examples.

Answer:

1. E. the retina contains three kinds of color receptors.
2. B. parallel processing.
3. D. amygdala.
4. A. hypothalamus.
5. B. psychoactive drugs.