Staddon and Simmelhag, 1971 ), while finding similar behavior, failed to find support for Skinner's " adventitious reinforcement " explanation for it.
2.
Terminal responses seem to reflect classical ( as opposed to operant ) conditioning, rather than adventitious reinforcement, guided by a process like that observed in 1968 by Brown and Jenkins in their " autoshaping " procedures.
3.
The causation of interim activities ( such as the schedule-induced polydipsia seen in a similar situation with rats ) also cannot be traced to adventitious reinforcement and its details are still obscure ( Staddon, 1977 ).