Russian researcher of conditioned reflexes (6)

I believe the answer is:

pavlov

(Other definitions for pavlov that I've seen before include "Russian who studied animals' reflexes" , "Russian psychologist" , "As reflex investigator" , "Ivan --, Russian studier of conditioned reflexes" , "Russian physiologist noted for studies of canine reflexes" .)

I've seen this clue in The Times.

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