(p. C4) . . . researchers at the University of California, Davis, the University of Iowa and Emory University have demonstrated that pigeons are surprisingly good at detecting cancer as well. Using grain as a reward, the scientists managed to train hungry pigeons to reliably spot malignancies in images of human breast cells.
The birds achieved roughly 85% accuracy, which is probably better than beginning medical students, the scientists said, although it doesn’t approach the prowess of seasoned pathologists. On the other hand, the birds’ training only involved 24 slides at four times magnification (and they graduated debt-free). What’s more, when Edward A. Wasserman and his colleagues exploited the “wisdom of flocks” by combining the “votes” of four pigeons on each slide, the birds’ accuracy shot up to an astonishing 99%.
When confronted with mammograms, by contrast, the pigeons were flummoxed. After awhile, they seemed to learn to detect cancer on these images, but when shown new ones, they couldn’t do any better than chance, which implies that they had simply memorized the right calls on the initial images during repeated viewings. By contrast, birds that learned to pick out cancer from tissue samples could carry over their skills to new images.
Why so good with images of actual tissue yet so bad with mammograms? The former consist of breast cells seen under a microscope, while the latter are murkier images of overlapping elements (such as blood vessels) within the breast. Like physicians, pigeons find it easier to make the diagnosis by looking at cells, which is why biopsies are taken.
For the full commentary see:
(Note: ellipsis added.)
(Note: the online version of the commentary has the date Dec. 11, 2015 [sic], and has the title “R&D; The Pigeons That Can Spot Breast Cancer.”)
The research summarized in the passages quoted above, was published in the academic article: