What is the smallest amount of stimulation that needs to be added to or subtracted from a stimulus to detect a difference 50 percent of the time?

Although there are neurophysiological systems in the brain associated with this emotion (fear) we ordinarily infer its existence more indirectly from three kinds of data.Fear is inferred indirectly from three kinds of data:

What will be an ideal response?

Many people can easily recall exactly what they were doing when they heard the news of the 9/11 terrorist tragedy. This best illustrates ________ memory.

a. echoic b. flashbulb c. implicit d. iconic