4 groups of rats were used to test the hypothesis that learning can be “transferred” by means of “ribonucleic” acid (RNA). The experimental group was injected with RNA obtained from the brains of rats conditioned to an avoidance response. The control group received no RNA. A second control group was given RNA which came from the brains of non-conditioned rats. The fourth group received RNA extracted from the muscles of conditioned rats. The results did not confirm the transfer hypothesis since no RNA facilitating effect on subsequent avoidance training was observed.
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