Final answer:
Donders and Ebbinghaus can be considered cognitive psychologists because of their focus on understanding mental processes and cognition.
Step-by-step explanation:
The term "cognitive psychology" may not have existed in the 19th century, but we could say that Donders and Ebbinghaus were cognitive psychologists because they both made significant contributions to the study of mental processes and cognition. Donders conducted experiments on reaction time to measure cognitive processes, while Ebbinghaus studied memory and learning. Both of these psychologists focused on understanding the inner workings of the mind, which aligns with the core principles of cognitive psychology.