Stimulus discrimination and stimulus generalization relationship

Domjan, M. (2014). The principles of learning and behavior. Nelson Education (p. 234-243)

Describe the relationship between stimulus discrimination and stimulus generalization. What are contextual cues?  How are they related to conditional stimulus control?

contextual cues-various features(visual auditory and olfactory) of the room or place where the discrete discriminative stimuli are presented. Describe how conditional discrimination is taught in pavlovian conditioning? Provide an example. What is the difference between excitation and modulation?Excitation modulation