The chimpanzee has long been considered to be similar to man and is often employed as a human surrogate in research. Investigation of the chimpanzee's sensory processes has been limited mainly to vision and audition. Where reliable information is available, the sensory systems of the chimpanzee and human are highly similar in structure and function. Chimpanzees, like humans, are trichromats and each has similar visual acuity. Perceptual phenomena, such as color and brightness contrast and movement, appear to be similar functions. Absolute auditory thresholds are similar for chimpanzees and humans, but the chimpanzee can apparently detect higher frequencies than the human. Only qualitative observations are available on the functions of the chimpanzee in the other sensory modalities so that chimpanzee-human comparisons in these modalities are largely conjecture. Width Weight (gr/kg body wt) Volume (total) Volume of cortex Gray cell coefficient (vol of griseum/vol of nerve cells in it) Cells Man 195 mm. 143 mm.
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