Middle-class teachers were significantly more permissive and less puritanical in outlook, took more pleasure in the emotional aspects of teacher-pupil relationships, and showed less authoritarian attitudes toward children than did lower-class teachers. (Author/MB)

Results indicated that the normal achievers learned more effectively under person and performance reinforcement than under tangible reinforcement, whereas the reverse was true for low achievers. (Author)

The present study explores the specific environmental influences in the intellectual development of 24 adoptive infants living in middle class families. (Author)