Therapist-controlled exposure in vivo versus self-controlled exposure in vivo: A comparison with obsessive-compulsive patients

Fourteen obsessive-compulsive clients were given treatment consisting of ten sessions of gradual exposure in vivo With half the clients, the exposure in vivo was therapist-controlled; with the other half, the exposure in vivo was self-controlled.

The results of the posttest showed that both versions of the treatment resulted in a significant improvement on the in vivo measurement, anxiety and avoidance scales, Leyton Obsessional Inventory, Self-Rating Depression Scale and anxious mood. Neither the posttest nor the follow-ups one month and 3.5 months later indicated a difference between the effects of the two conditions. Self-controlled exposure in vivo proved to be as effective as therapist-controlled exposure in vivo, in spite of the fact that in the latter condition each treatment session lasted twice as long as in the former condition.     

The influence of symbolic and motor rehearsal in observational learning

The experiment investigated the effects of the mode and patterning of rehearsal on the acquisition and retention of modeled activities varying in organizational complexity. Subjects observed a filmed model construct two configurations, containing high or low organizational requirements. Immediately after exposure they rehearsed the modeled activities either mentally, motorically, mentally and then motorically, motorically and then mentally, or engaged in a distracting activity that prevented rehearsal of what they had see. Performance tests were conducted immediately after the rehearsal phase and again 1 week later. Subjects who rehearsed the modeled behaviors symbolically, whether singly or in conjunction with motor practice, reproduced both configurations more accurately than those who rehearsed motorically or not at all. Motor rehearsal increased speed on the organizationally simple task, but did not enhance response acquisition over and above observation alone. The overall results are interpreted as supporting the social learning view that modeled behaviors are best acquired when demonstrated activities are first organized symbolically and then refined on the basis of performance feedback.     

Crossed aphasia in an illiterate dextral

An 83 year old illiterate, right-handed woman developed a persistent nonfluent aphasia following a right cerebral infarction (crossed aphasia). Computerized axial tomography localized the lesion to the right posterior frontal lobe.It is suggested that the neural mechanisms involved in learning to read and write may be critical for the complete establishment and maintenance of language dominance in the left hemisphere, and that, in this case, the patient's failure to acquire reading and writing skills altered the normal evolution of language lateralization and resulted in the right hemisphere assuming the dominant role.