Final answer:
The Behavior Technician would be measuring Andrew's reaction time, which is the time it takes for him to respond after being called. Reaction time differs from attention span, memory capacity, and verbal fluency, which are related but separate cognitive functions.
Step-by-step explanation:
If a Behavior Technician measured the length of time that it took Andrew to respond to someone calling him, she would be measuring the reaction time. Reaction time is the interval between stimulation and response, and in this context, it's the time taken for Andrew to respond upon being called. Tests of attention span measure how long a person can concentrate on a particular task without becoming distracted. Memory capacity, especially short-term memory capacity, refers to the ability to retain information actively in the brain for a brief period of time. Verbal fluency is a cognitive function that facilitates the ease of producing words and is not directly measured by response to someone calling one's name.
As an example to understand the concept, an experiment to determine your reaction time might involve catching a dropped ruler, as this measures the time it takes to respond to the visual stimulus of the ruler starting to fall. Reaction time is a critical measure in many tests of cognitive function, as well as in everyday activities such as driving, where delayed reaction times can lead to accidents.