The operant conditioning of conversation

Human conversation is a natural place to begin the study of social responses. In a conversation, a number of individuals use one another's responses as cues for their own behavior. So long as a conversation is being held, the speakers must talk in some order. Four experiments were conducted to test whether differentially reinforcing a group of speakers can bring the order of speakers under experimental control. The results are all consistent with the hypothesis. The paper also devises and evaluates different procedures for studying conversational sequences and examines associated statistical problems.     

Validity of rating scales in assessing aggressive behavior in classroom settings

The teachers of 35 boys attending a Lehigh University-based laboratory school for emotionally and behaviorally disturbed children completed rating scales designed to assess aggressive behavior in children. Children also completed similar self-report instruments. Frequency counts of aggressive outbursts and outburst durations were recorded by teachers over a 4-week period. The results of the study found significant correlations among teacher-completed and child-completed measures. The relationships between child-completed measures, one of the teacher measures, and the direct observation measure were not significant. One teacher-completed measure, but no child-completed measures, had significant correlations with aggressive outbursts and durations. The implications for behavioral assessment are discussed.     

The role of the right hemisphere in the control of speech prosody in propositional and affective contexts

Sixteen right-handed adult males with localized insult to either the right or left hemisphere and five control subjects without brain damage read aloud target sentences embedded in paragraphs, while intoning their voices in either a declarative, interrogative, happy, or sad mode. Acoustical analysis of the speech wave was performed. Right-anterior (pre-Rolandic) and right-central (pre- and post-Rolandic) brain-damaged patients spoke with less pitch variation and restricted intonational range across emotional and nonemotional domains, while patients with right posterior (post-Rolandic) damage had exaggerated pitch variation and intonational range across both domains. No such deficits were found in patients with left posterior damage, whose prosody was similar to that of normal control subjects. It is suggested that damage to the right hemisphere alone may result in a primary disturbance of speech prosody that may be independent of the disturbances in affect often noted in right-brain-damaged populations.