The effectiveness of training procedures which used visual-visual arbitrary matching, blocked-trial matching-to-sample, and successive discrimination training to teach visual-visual discrimination of two-dimensional forms was evaluated with two men having severe mental retardation. Results indicated that the procedures did establish conditional…

Behavioral differences have often been noted between blacks and whites. These differences seem to be associated with the perception and interpretation of the environment and the subsequent selection of the appropriate adapting strategies. This is a socialized difference which is best explained by the concept of psychological differentiation or…