Adiscriminative stimulus is a stimulus that select one: a. provides the organism with a cue that making any of several responses will lead to reinforcement b. leads a person to discriminate against one group of people based on ethnicity or race c. cues the person into which schedule of reinforcement is being used in operant conditioning d. signals the presence of reinforcement.

Not all members of the radio audience of orson welles' war of the worlds broadcast panicked immediately. indeed, some didn't panic until they looked out of the window and saw empty streets; others didn't panic until they saw streets full of traffic. it was after checking out the situation that these citizens decided that the martians had indeed invaded earth. this example illustrates that contagion can result when people look to others for the interpretation of ambiguous situations . can result when cultural norms reinforce people's most likely responses. occurs primarily because humans are by nature irrational creatures. is especially likely when people are motivated to make independent decisions.