Final answer:
The acrid burning smell triggering intense feelings of jitteriness and distress for Alejandra after witnessing the 9/11 attack is an example of classical conditioning.
Step-by-step explanation:
The acrid burning smell that triggers intense feelings of jitteriness and distress for Alejandra, a resident of lower Manhattan, after witnessing the attack on the twin towers of the World Trade Center on September 11, 2001, is an example of classical conditioning. Classical conditioning is a type of learning in which an individual associates two stimuli together and learns to respond to a previously neutral stimulus.
In this case, the smell and the traumatic event have become associated in Alejandra's mind, leading to a fear response when she encounters that particular smell. The smell has become a conditioned stimulus (CS) that elicits a conditioned response (CR) of jitteriness and distress.
It is important to note that classical conditioning can occur unconsciously and can have a powerful impact on our behavior and emotions.