Helmholtz's explanation of color vision is called the ________.

A) opponent-process theory
B) additive color mixing theory
C) trichromatic theory
D) reductive color mixing theory

Which of the following are witnessed during the sensorimotor stage of cognitive development?

A) Tertiary circular reactions
B) Concrete identifications of objects
C) Naming conventions
D) Abstract information development

The effects of climate,noise,population density,family size,and multiethnic communities illustrate that development is:

A) linear.
B) multi-directional.
C) multi-contextual.
D) multi-cultural.

What increases led to Darcy being startled when Darcy's brothers started yelling

A)  frequency of the sound 
B)  amplitude of the sound 
C)  purity of the sound 
D)  timbre of the sound

By pairing the ringing of a bell with the presentation of meat, Pavlov trained dogs to salivate to the sound of a bell even when no meat was presented. In this experiment, salivation to the bell was the ________.

A) conditioned stimulus
B) unconditioned stimulus
C) unconditioned response
D) conditioned response

Cohabitating middle-aged men seem to feel more depressed than married men because they

A) worry about not having care in their elderly years from their mate.
B) cannot determine the quality of the relationship.
C) still feel divorced or single.
D) None of these