A learning task was used to examine the differences in responsiveness to symbolic and tangible incentives with 24 predelinquent and 25 nondelinquent 15-year-old boys. (Author/SBH)

An earlier version of the paper was presented at the meeting of the American Association on Mental Deficiency (Boston, Mary 1968). (Author)

The times needed to initiate and terminate voicing in response to series of short segments of auditory signal were studied for 20 stuttering and 20 nonstuttering children (ages for both groups 5 to 12). The effects of random reward and nonreward on the phonatory response times also were studied. (Author/PHR)

A study of the difference in student performance when currency or token money is used was studied with six mildly mentally retarded children (ages 8 to 12) as Ss. Students were given jobs (teacher aide, movie projectionist, art or shop teacher) and were rated in the areas of punctuality, appearance, following directions, completing tasks, and…

The reinforcing properties of language were examined with four autistic and five mentally retarded children matched for mean nonverbal mental age (32-37 months). Ss were shaped to pull a lever which produced 2 seconds of a tape recorded story. The story was read with the following conditions: little pitch variance from word to word, but with…

To compare social versus mechanical presentation of stimulus material under prompted or trial-and-error (confirmation) conditions of learning, institutionalized educable and trainable mentally handicapped children were tested on a discrimination learning task. Results were felt to indicate that social reinforcement may not be as motivating for…