Almost Human: A Journey into the World of Baboons by Shirley Strum PDF

By Shirley Strum

ISBN-10: 0393307085

ISBN-13: 9780393307085

In 1972, a tender graduate pupil named Shirley Strum traveled to Kenya to check a troop of olive baboons (Papio anubis) nicknamed the Pumphouse Gang. Like our personal ancestors, baboons had tailored to lifestyles at the African savannah, and Strum was hoping that via gazing baboon habit, she may possibly examine whatever approximately how early people may need lived. quickly the baboons had gained her middle in addition to her brain, and Strum has been operating with them ever since.

Vividly written and choked with interesting insights, nearly Human chronicles the 1st fifteen years of Strum's fieldwork with the Pumphouse Gang. From the 1st paragraph, the reader is drawn in addition to Strum into the area of the baboons, studying concerning the tragedies and triumphs in their day-by-day lives—and the lives of the scientists learning them.

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Extra info for Almost Human: A Journey into the World of Baboons

Example text

Each of the stereograms in their experiment maintained a constant disparity over time, but its Fourier phase was varied from frame to frame by constantly rearranging the dots. , 2001). , 1991). To build a working stereo algorithm, however, one needs to specify how this phase independence is achieved and how an unknown stimulus disparity can be recovered from these responses. , and Freeman, 1999c). The model is known as the disparity energy model, since it is a binocular extension of the well-known motion energy model (Adelson and Bergen, 1985; Watson and Ahumada, 1985).

For stimuli without a dominant orientation, such as random textures, cells tuned to all orientations, with both positive and negative signs of tan θ , will be activated. These cells will report equivalent horizontal disparities of different signs and magnitudes, and the average result across all cells should be near zero. The only possibility of seeing depth from vertical disparity in stimuli without a dominant orientation arises when certain orientations are overrepresented by the cells in the visual cortex and, consequently, their equivalent horizontal disparities are not completely averaged out after pooling across cells tuned to all orientations.

On the other hand, it is neither economical nor necessary for the brain to encode relative disparity across the entire binocular visual field. Assume that the brain has computed absolute disparities at N points in a scene. Since there are N(N − 1) ordered pairs of the N points, a much greater amount of resources would be required for the brain to convert and store all the N(N − 1) relative-disparity values. An alternative possibility is that the brain might simply use absolute disparity across the whole field as an implicit representation of the relative disparity, and compute the relative disparity explicitly only for the pair of points under attentional comparison at any given time.

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Almost Human: A Journey into the World of Baboons by Shirley Strum


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