Taped Vocalization as a Reinforcer of Vocal Behavior in a Female Agile Gibbon (Hylobates Agilis)

The study demonstrated the effectiveness of tape-recorded answering calls as reinforcers of vocal behavior in a female agile gibbon. Following baseline, typical conditioning, extinction, and reconditioning effects were demonstrated. The findings support the proposition that many species-typical behaviors may act as reinforcers.

VIII.—The Short Muscles of the Hand of the Agile Gibbon (Hylobates agilis), with Comments on the Morphological Position and Function of the Short Muscles of the Hand of Man

The kindness of Professor Cunningham has enabled me to carry out the dissection of a gibbon in his possession. The dissection was performed in 1905, in the Anatomical Department of the University of Edinburgh. The following paper is a description of the short muscles of the hand of the animal, to which is added a consideration of the primitive position and function of the short muscles of the human hand.