Final answer:
Isaiah is most likely experiencing stimulus generalization according to the "Learning and Conditioning" lecture.
Step-by-step explanation:
Isaiah is most likely experiencing stimulus generalization according to the "Learning and Conditioning" lecture. Stimulus generalization occurs when an organism demonstrates the conditioned response to stimuli that are similar to the conditioned stimulus. In this case, Isaiah's physiological response of an increased heart rate and sweaty palms is being triggered by emails from different medical schools which are similar to the conditioned stimulus of receiving email from one medical school's admissions team.