_____ typically receives credit for the discovery of classical conditioning. Pavlov Skinner Rogers Watson Which conclion have researchers come to regarding learning studies ing vario species? Learning is evident only in higher-order species, such as mammals. Biological factors influencing learning are unique to each species; th, their learning processes are vastly different. Biological factors influencing learning can be unique to each species, but their learning processes are basically the same. Maturation applies only to higher-order species, such as mammals.