Two groups of planarians, a light-escape contingent group and their yoked control pairs, were tested over a 4-hr. period. The response of breaking a photobeam was automatically recorded for both groups. For Ss in the light-escape contingent group, breaking the photobeam resulted in the 60-sec. termination of an intense overhead illumination. The response rate of the light-escape contingent group was greater than that of their yoked pairs.
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