MECHANISMS OF PLACEBO PAIN REDUCTION:

Abstract— Identical experimental pain stimuli were applied to the right and left index fingers of 56 university students, following the application of a placebo in the guise of a topical anesthetic to one of the fingers. The pain stimuli were administered simultaneously to treated and untreated fingers for half of the subjects and sequentially for the others Significant and equtvalent reductions in pain were reported in both conditions as a function of placebo administration. These data indicate that reductions of experimental pain produced by placebos presented in the guise of local anesthetics are not mediated by such global mechanisms as anxiety reduction or the release of endogenous opioids.     

The impetus to scientific psychology: A recurrent pattern

In the nineteenth century, the personal equation, which concerned individual differences in the accuracy of astronomical observations, provided an impetus to the development of experimental psychology. During the first decade of Wundt's laboratory, the measurement of the duration of mental acts received more experimental attention than any other subject. Twentieth century developments in theoretical physics have stimulated interest in the nature of mental operations and conceptual transformations, a topic which is currently receiving increased attention in psychology. It is suggested that the history of psychology may provide a useful data source for additional work in this area.     

Suggested visual hallucinations in and out of hypnosis

We administered suggestions to see a gray-scale pattern as colored and a colored pattern in shades of gray to 30 high suggestible and eight low suggestible students. The suggestions were administered twice, once following the induction of hypnosis and once without an induction. Besides rating the degree of color they saw in the stimuli differently, participants also rated their states of consciousness as normal, relaxed, hypnotized, or deeply hypnotized. Reports of being hypnotized were limited to highly suggestible participants and only after the hypnotic induction had been administered. Reports of altered color perception were also limited to high suggestibles, but were roughly comparable regardless of whether hypnosis had been induced. These data indicate that suggestible individuals do not slip into a hypnotic state when given imaginative suggestions without the induction of hypnosis, but nevertheless report experiencing difficult suggestions for profound perceptual alterations that are pheonomenologically similar to what they report in hypnosis.     

Dissociating cognitive and motor interference effects on kinesthetic short-term memory

In two experiments, we investigated how short-term memory of kinesthetically defined spatial locations suffers from either motor or cognitive distraction. In Exp. 1, 22 blindfolded participants moved a handle with their right hand towards a mechanical stop and back to the start and then reproduced the encoded stop position by a second movement. The retention interval was adjusted to approximately 0 and 8 s. In half of the trials participants had to provide a verbal judgment of the target distance after encoding (cognitive distractor). Analyses of constant and variable errors indicated that the verbal judgments interfered with the motor reproduction only, when the retention interval was long. In Exp. 2, 22 other participants performed the same task but instead of providing verbal distance estimations they performed an additional movement either with their right or left hand during the retention interval. Constant error was affected by the side of the interpolated movement (right vs. left hand) and by the delay interval. The results show that reproduction of kinesthetically encoded spatial locations is affected differently in long- and short-retention intervals by cognitive and motor interference. This suggests that reproduction behavior is based on distinct codes during immediate vs. delayed recall.     

Response expectancy theory and application: A decennial review

Response expectancy is the anticipation of automatic, subjective, and behavioral responses to particular situational cues. More than a decade of research in diverse laboratories indicates that response expectancies are important considerations in designing and administering treatments and prevention programs for such problems as anxiety disorders, depression, substance abuse, and sexual dysfunction. Response expectancy also plays a central role in the effects of antidepressive medication, psychotherapy, and hypnosis. In addition, studies of the effects of placebos reveal that response expectancies can produce lasting changes in pain, anxiety, depression, alertness, tension, sexual arousal, alcohol craving and consumption, aggression, asthma, warts, and contact dermatitis. The veracity of many self-reported placebo effects have been corroborated by changes in physiological function.     

Panel: The complementary roles of the IAAP and the JAP in developing Jungian clinical practice

The relationship between the IAAP (International Association for Analytical Psychology) and the JAP (  Journal of Analytical Psychology ) in the course of their 50-year old existence is explored from historical, theoretical, institutional, personal and clinical perspectives. This relationship is seen to have been contentious as well as complementary in promoting an interdisciplinary approach to Jungian clinical practice. The complementary aspects are evidenced in the training programmes of IAAP constituent Societies and in papers presented at the Cambridge Congress of 2001 and the Barcelona Congress of 2004. The role of the Journal in holding together different, sometimes divergent, views relating to Jung's concepts and theories, and in subjecting these views to discussion, debate and assessment as to their clinical relevance and effectiveness, is explored.