Brightness contrast is responsible for which of these observations?
a. An object seems brighter if it is next to something bright
b. An object seems brighter if it is next to something dark.
c. An object seems brighter if it is motionless than if it is moving.
d. An object seems brighter after you stare at it for a while.
b
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Sodium ions flow into a neuron's cell body through sodium channels in response to:
a. an inhibitory message b. hyperpolarization c. an action potential d. an excitatory message
Which of the following is a psychological disturbance that lasts more than one month or even years following stresses that would produce anxiety in anyone who experienced them?
a. agorophobia b. dissociative disorder c. acute stress disorder d. post-traumatic stress disorder
All of the following indices of self-awareness can be observed in humans late in the second year except
a. the use of personal pronouns: I, me, my, and mine. b. the display of self-conscious emotions such as embarrassment. c. the increasing differentiation of the sense of self. d. the display of new symbolic abilities.
According to the Centers for Disease Control (2003), which of the following ethnic groups participates the most in free-time physical activity?
A) African Americans B) Hispanics C) whites D) There are no differences across ethnic groups in free-time physical activity.