Sequential effects within a short foreperiod context: evidence for the conditioning account of temporal preparation

Responses to an imperative stimulus (IS) are especially fast when they are preceded by a warning signal (WS). When the interval between WS and IS (the foreperiod, FP) is variable, reaction time (RT) is not only influenced by the current FP but also by the FP of the preceding trial. These sequential effects have recently been proposed to originate from a trace conditioning process, in which the individuals learn the temporal WS-IS relationship in a trial-by-trial manner. Research has shown that trace conditioning is maximal when the temporal interval between the conditioned and unconditioned stimulus is between 0.25 and 0.60 s. Consequently, one would predict that sequential effects occur especially within short FP contexts. However, this prediction is contradicted by Karlin [Karlin, L. (1959). Reaction time as a function of foreperiod duration and variability. Journal of Experimental Psychology, 58, 185-191] who did not observe the typical sequential effects with short FPs. To investigate temporal preparation for short FPs, three experiments were conducted, examining the sequential FP effect comparably for short and long FP-sets (Experiment 1), assessing the influence of catch trials (Experiment 2) and the case of a very dense FP-range (Experiment 3) on sequential FP effects. The results provide strong evidence for sequential effects within a short FP context and thus support the trace conditioning account of temporal preparation.     

Temporal preparation improves temporal resolution: Evidence from constant foreperiods

Recent research shows that temporal preparation within a constant foreperiod design improves the spatial resolution of visual perception. The present experiments were designed to investigate whether similar benefits of temporal preparation can be observed in a task that requires high temporal resolution. In three experiments, we assessed the effect of temporal preparation on temporal order judgments (TOJs). In Experiment 1, short foreperiods facilitated TOJ for two spatially adjacent dots. This finding was replicated in Experiment 2, in which the temporal order of two spatially overlapping stimuli (“+” and “x”) had to be discriminated. Experiment 3 investigated the time course of temporal preparation by extending these findings to a wide range of different foreperiod durations. The present findings corroborate recent evidence for a perceptual locus of temporal preparation. Most importantly, they show that temporal preparation within a constant foreperiod design improves the temporal resolution of visual perception, independently of whether TOJ requires a decision about the location or about the identity of the target stimuli.     

Response grouping in the psychological refractory period (PRP) paradigm: models and contamination effects

Response grouping is a ubiquitous phenomenon in psychological refractory period (PRP) tasks, yet it hampers the analysis of dual-task performance. To account for response grouping, we developed several extended versions of the standard bottleneck model, each of which incorporates a possible grouping mechanism into this model. Computer simulations were used to assess how the predictions of the standard model would change with each grouping mechanism. One set of simulations investigated the basic effects of grouping on the means and intercorrelation of the reaction times in the two tasks, as well as the percentage of trials with short interresponse times (IRTs). A second set of simulations examined whether response grouping would invalidate the use of PRP paradigms for localizing experimental effects. Finally, we investigated whether the post-hoc elimination of trials with short IRTs removes the contaminating effects of response grouping.     

Somatoforme Störungen bei ambulanten dermatologischen Patienten

Zusammenfassung In der vorliegenden Studie wurde die Häufigkeit somatoformer Symptome in einer dermatologischen Universitätsambulanz untersucht. An der Studie nahmen n=195 Patienten teil, die Screeningfragen zu somatoformen, dermatologischen und depressiven Symptomen ausfüllten. Zusätzlich wurde eine dermatologische Beurteilung der Symptome hinsichtlich der Ätiologie erfasst. Danach wiesen 26,2% der Patienten Hinweise auf eine somatoforme Störung auf; am häufigsten waren somatoforme Schmerzstörung (16,9%) und körperdysmorphe Störung (15,4%). Unter den spezifischen dermatologischen Symptomen wurde Juckreiz besonders häufig (10,3%) als somatoform klassifiziert. Der Anteil von Patienten mit erhöhten depressiven Beschwerden lag bei 17,3%. Die Ergebnisse sprechen für eine erhöhte Prävalenz somatoformer Störungen bei dermatologischen Patienten. Die Identifizierung und psychotherapeutische Versorgung dieser Patientengruppe sollte in der dermatologischen Routineversorgung mehr Beachtung finden.     

Gewalt und Missbrauch in der Psychotherapie

Starting from the fundamental ethical principles of medicine, the different forms of abuse in psychotherapy are described and discussed in the context of particular case studies. Besides sexual abuse, also the more subtle violations of basic ethical principles are taken into consideration. These include especially orally-exploitative forms of abuse, therapists’ improper acting-out of their own desires for close attachment or dominance conflicts, and narcissictic abuse. Finally, a particular type of narcissistic abuse is dealt with: the over-emphasis on the therapist’s own therapeutic method, with a tendency to dismiss alternative treatment strategies that might be more appropriate for the individual patient.     

Aspects of grammatical development in young French children with SLI

This paper presents an exploratory study of the spontaneous production of 11 French children clinically diagnosed as specific language impaired (SLI). In a cross‐sectional study of the children under and over 5 years of age, we investigate the production of finite and non‐finite verbal forms, of sentences with overt and null subjects, and of pronominal clitics. A comparison between younger and older children with SLI highlights developmental patterns which parallel normal syntactic development in important respects, though at a slower pace. An area of difficulty which clearly persists for the older group involves the domain of pronominal complement clitics.     

Warum man Essentialist sein kann – eine logische Konstruktion im Schnittfeld von Sprache, Ontologie und Naturwissenschaft

Essentialism is, on the one hand, anchored with considerable firmness in a common sense picture of the world. On the other hand, it was dismissed for logico-philosophical reasons by a scientifically minded theorist like Quine. ``New essentialists' like Kripke did engage in very profitable theorizing on an essentialist basis, but made no significant effort to investigate the prospects of imparting to an essentialist metaphysics a solid foundation within a scientific world view. These foundational prospects are the concern of the article. – The investigation is guided by two ideas which are elaborated within a proof theoretical framework in the course of the article. First, being an essential F (where ``F' represents a predicate) is linked with a lifelong possession of the property signified by ``F' (but there is something more in it). Second, a special kind of necessity is involved in (true) predications of essential F-ness; it should be capable, like possibly all kinds of necessity, of being spelt out, in the final analysis, in terms of the provability of appropriate propositions in appropriate theoretical systems. In outlining the relevant axiomatic bases, the article draws on an early paper by E. Hirsch on individuation and essence.