What did Dr. Fogelson focus on during his doctoral studies at Dartmouth College?
Dr. Fogelson focused on investigating hierarchical-category learning mechanisms within the visual system.
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### Instruction:
What did Dr. Fogelson focus on during his doctoral studies at Dartmouth College?

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### Response:
Dr. Fogelson focused on investigating hierarchical-category learning mechanisms within the visual system.<|im_end|>