He published a 1958 paper that was contemporaneous with a similar study by John Bowlby, pioneering work in a field notably studied by Mary Ainsworth.  
His experiments with positive reinforcement showed that animals eventually adopt a "win-stay, lose-shift" strategy to picking the "correct" object, which led him to devise his theory of cognition that he dubbed "learning to learn."  He published a 1958 paper that was contemporaneous with a similar study by John Bowlby, pioneering work in a field notably studied by Mary Ainsworth.  He invented a device also known as the "Vertical Chamber," into which were placed six-month-old individuals, who usually emerged psychotic.  This "Rape Rack" and "Pit of Despair" deviser also conducted an experiment using surrogate mothers made of wire and terrycloth.  For 10 points, name this Wisconsin-Madison psychologist whose experiments usually involved monkey-torturing.
His experiments with positive reinforcement showed that animals eventually adopt a "win-stay, lose-shift" strategy to picking the "correct" object, which led him to devise his theory of cognition that he dubbed "learning to learn."  
Harry Frederick {Harlow}