Visual control of posture in real and virtual environments

In two experiments, we investigated the stabilizing influence of vision on human upright posture in real and virtual environments. Visual stabilization was assessed by comparing eyes-open with eyes-closed conditions while subjects attempted to maintain balance in the presence of a stable visual scene. Visual stabilization in the virtual display w as reduced, as compared wit hreal-world viewing. Th is differencewas partially accountedfor by the reduced field of view in the virtual display. When the retinal flow inthe virtual display wasremoved by using dynamic random-dot stereograms with single-frame lifetimes (cyclopean stimuli), vision did notstabilize posture. There was also an overall larger stabilizing influence of vision when more unstable stances were adopted (e.g., one-foot, as compared with side-by-side, stance). Reducing the graphics latency of the virtual display by 63% did not increase visual stabilization in the virtual display. Other visual and psychological differences between real and virtual environments are discussed.     

Unerwünschte und schädliche Wirkungen von Psychotherapie

Unwanted effects or even damage due to psychotherapy are largely neglected issues within psychotherapy research as compared to other fields. On the other hand, it is reasonable to assume that unwanted effects of a treatment which intends to influence patients into a positive direction are very likely. The rate of negative effects of psychotherapy (the deterioration effect according to Bergin) is consistently estimated to be 10% of all cases and shows this same rate in a variety of studies. This review highlights side effects of psychotherapy both on the part of the patients and of the therapists. It reports unwanted effects related to different psychotherapeutic methods, i.e. psychoanalysis, cognitive behaviour therapy, client-centered psychotherapy and – beyond these basic orientations – group psychotherapy. The paper also reports on negative effects of psychotherapy on an untreated partner. Finally, some proposals are given on how negative effects of psychotherapy could be diminished. The authors especially highlight the possibilities of changing the therapist, the treatment technique, or the theoretical treatment approach as a way to reduce negative effects.     

Brauchen wir Richtlinien oder Leitlinien für psychotherapeutische Behandlungen?

In many countries, psychotherapy is increasingly influenced by standards of scientifically evaluated methods and disorder-specific approaches. Referring to the definitions of the Scientific Council for Psychotherapy in Germany (WBP) concerning the differentiation of modalities, methods and techniques, this article points out that clear distinctions between modalities and methods are increasingly vanishing; instead, the tendency, especially within behavior therapy, to integrate all scientifically based methods and techniques is prevailing. This trend runs parallel with a development away from ?disorder-specific“ to a ?disorder-oriented“ approach. Facing the fact that technical aspects explain a relatively small proportion of outcome variance in psychotherapy, research related to the quality of psychotherapists is recommended. In addition, ?empirically validated psychotherapists“ should receive guidelines instead of rules of action.     

He said,she said: Episodic retrieval induces conflict adaptation in an auditory Stroop task

People respond more slowly if an irrelevant feature of a target stimulus is incompatible with the relevant feature or the correct response. Such compatibility effects are often reduced in trials following an incompatible trial, which has been taken to reflect increased cognitive control. This pattern holds only if two trials share some similarities, however, suggesting that it may be modulated by the episodic context. To look into this possibility, we had participants respond to high- or low-pitched tones by saying “high” or “low,” respectively, and ignore the simultaneously presented auditory word “high” or “low.” As expected, performance was impaired if the heard word was incompatible with the required response, and this Stroop-like effect was reduced after incompatible trials. This sequential modulation was observed, however, only if the voice in the two successive trials was the same, whereas no modulation was obtained when the speaker changed. The results suggest that sequential modulations are due to the automatic retrieval of episodic event representations that integrate stimuli, actions, and situational and task-specific control information, so that later reactivation of some elements of a given representation tends to retrieve the other elements as well.     

Stimulus and response priming in rapid serial visual presentation: evidence for a dissociation

Two experiments investigated the capacity demands of stimulus and response priming in a rapid serial visual presentation (RSVP) task. Three targets were presented in a stream of visual symbols: The first two (T1 and T2) required an unspeeded manual response at the end of the trial, but the third (T3) called for an immediate,speeded manual response. T2 and T3 either were identical (fully compatible), required the same response (response compatible), or required different responses (incompatible). Priming in the fully compatible condition depended strongly on successful identification of the priming stimulus, whereas response-based priming was observed regardless of whether the prime could be reported or not. These findings suggest that stimulus coding and response coding are automatic processes, unaffected by attentional capacity constraints, followed by capacity-limited stimulus consolidation and response selection. Moreover, even though response codes are activated automatically upon stimulus processing, both types of codes act, and affect behavior, independently.     

心理治疗效果评定量表(简式)在中、德应用的心理测量学研究(英文)

419名中国和德国被试参加了本研究,并回答了若干简式心理健康量表。所选的这套量表能对心理治疗不同阶段的效果(Howard’s阶段模型:重新认识期-转变期-康复期)进行测查。本研究目的在于考察这些简式量表能否用于认知-行为治疗跨文化培训项目中的质量管理。结果显示,这些量表在中德两种文化背景下都有很高的信度和效度(聚合效度和敏感性)。尽管项目间的高相关似乎提示心理健康模型只有一个维度,但探索性因素和理论分析则更支持心理健康是一个分为8个亚维度的模型,其中每个亚维度或者与基础情绪、或者与社会性情感相连关联。本文最后就研究结果及其对心理治疗质量控制的意义进行了详细讨论。     

Forward and backward second-order Pavlovian conditioning in honeybees

Second-order conditioning (SOC) is the association of a neutral stimulus with another stimulus that had previously been combined with an unconditioned stimulus (US). We used classical conditioning of the proboscis extension response (PER) in honeybees (Apis mellifera) with odors (CS) and sugar (US). Previous SOC experiments in bees were inconclusive, and, therefore, we attempted to demonstrate SOC in the following three experiments: (Experiment 1) After differential conditioning (pairing odor A with US and presenting odor B without US), the bees experienced two pairs of partially overlapping odors, either a new odor C followed by a previously reinforced odor A (C-A) or a new odor C followed by a previously nonreinforced odor B (C-B). (Experiment 2) After differential conditioning, bees were presented with C-A or A-C. (Experiment 3) Bees were first presented with C-A or A-C before differential conditioning and were tested with odor C. We observed: (Experiment 1) 40% of the bees showed PER to the C-A presentation, but only 20% showed PER to the C-B presentation. (Experiment 2) 40% of the bees showed PER to the C-A presentation, while only 20% showed PER to the reversed sequence A-C. Experiments 1 and 2 showed that a previously reinforced odor can be a secondary reinforcer for excitatory SOC only with forward-pairing. (Experiment 3) PER toward C was lower (15%) in bees presented with A-C than with C-A (25%). This showed that backward SOC is not as effective as forward SOC. These results help to delineate different conditions that are critical for the phenomenon of SOC.