Projective methods and verbal learning.

"This experiment investigated the question of whether some methods of measuring verbal learning were more sensitive than others in revealing the effects of frequency and consequence. It was found that the effects of frequency were homologous, regardless of the test used to measure verbal learning. The methods were not equivalent in revealing the effects of consequence (reward and punishment). The more difficult the particular test used to measure verbal learning, the lower was S's absolute score and the more likely to appear were the effects of reward and punishment." (PsycINFO Database Record (c) 2010 APA, all rights reserved)