Stimulus Polarity and Conditioning in Planaria

See allHide authors and affiliations

Science  23 Aug 1963:
Vol. 141, Issue 3582, pp. 728-730
DOI: 10.1126/science.141.3582.728


Orientation in the monopolar pulse field used as the unconditioned stimulus was found to influence formation of a conditioned response to light in planarians. Planarians trained while oriented with the head toward the cathode reached maximal response rates rapidly, while those trained while oriented toward the anode showed no evidence of conditioned response formation.