The reinforcement of least-frequent interresponse times.

By D. Blough. 1966

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Indeterminacy in brain and behavior. (2005, background): “Regardless of these human data then, can non-human animals produce apparently indeterminate behaviors if they are reinforced for doing so? Blough (1966) was one of the first to ask this question directly by specifically reinforcing pigeons for producing behavior that approximated a random process.”
Operant variability and voluntary action. (2010, background): “In an impressive demonstration, Blough (1966) reinforced pigeons for pecking a response key with interpeck intervals that would parallel emissions of atomic particles.”