To figure out whether elephants can cooperate, Plotnik and Frans de Waal, a comparative psychologist
at Emory University in Atlanta, built a test.
According to BBC News, the findings came from tests carried out by comparative psychologist
Dr Michael Beran of Georgia State University, Atlanta, US, on three chimps, a 37-year-old female called Lana, a 21-year-old female called Panzee and a 34-year-old male called Sherman.
He is a comparative psychologist
, co-founder of the International Society for Comparative Psychology, and Historian/Archivist of APAs Division (6) of Behavioral Neuroscience and Comparative Psychology.
David Smith, a comparative psychologist
at the university.
Because the exposure times are so brief, the test challenges perception as well as memory, says comparative psychologist
Herbert Roitblat of Ventura, Calif.