ABSTRACT
Although elaborate instrumentation is not re quired for good research in comparative psy chology, the manipulation, control, and mea surement of variables in the study of animal behavior has frequently been facilitated by ad vances in technology and the invention of ap paratus. Instrumentation serves to increase the precision of measurements and to standardize tests procedures, which in turn facilitates com parable research methods across species and across laboratories. Developments in apparatus can also open completely new lines of inquiry, fostering questions that could not have previ ously been addressed and, occasionally, chal lenging findings established in previous re search. Revolutions in science have frequently accompanied major developments in apparatus such as the invention of the microscope and the telescope. What instruments will be remem bered as being revolutionary in the history of comparative psychology?
