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Hubel and Wiesel injected a radioactive amino acid into one eye of a laboratory animal, and later, subjected slices of their animals' primary visual cortex to autoradiography. They observed a. radioactivity in only one hemisphere. b. bands of radioactivity called thick stripes and thin stripes. c. alternating stripes of radioactivity and nonradioactivity. d. bands of radioactivity called interstripes. e. no radioactivity
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