cognitive psychology. PhD 
(source: Goldstone et al. “Adapting Perception, Action, and Technology for Mathematical Reasoning.")
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Me, a lowly HCI researcher: look at tool that changes how people read complex programs. I will run a 10 person in-lab study. You, the erudite psychologist: I will recruit 65,000 children and see whether 1 + 2*3 is harder than 1+2 *3.
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Me: I'm going to see how hard it is for programmers to remember a few variable names. You: I will train a random CMU undergrad for 250 hours over the course of two years. They will memorize more numbers than anyone in recorded history. (Chase & Ericsson, "Skilled Memory" 1980)
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