The table below shows hypothetical monthly cell phone plan fees for the identical service over several years. 
TABLE 2-2 Refer to Table 2-2.Assume that 2015 is used as the base year,with the index number = 100.The value of the index number in 2019 is
Definitions:
ERP
Event-Related Potential; a measured brain response that is the direct result of a specific sensory, cognitive, or motor event.
Consciousness
A state of being aware of and able to think about one's own existence, sensations, thoughts, surroundings, and experiences.
Brain Plasticity
The brain's capacity to change and adapt as a result of experience, including the ability to reorganize itself by forming new neural connections.
Allergic Response
The body's immune system reaction to a substance (allergen) that is not harmful to most people, resulting in symptoms such as sneezing, itching, or rash.
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