Search
Now showing items 1-1 of 1
Factors influencing the variance in sign learning performance by four juvenile orangutans (Pongo pygmaeus) /
(The University of Oklahoma., 1985)
Following the methods of Gardner and Gardner 1969 and Fouts 1973 , ten signs (American Sign Language) were trained to four juvenile orangutans. None of the subjects acquired all of the signs even after 2400 trials ...