670 research outputs found
Hypertension and renal failure prevention and management after cancer therapy
No full textNo abstract available
Requirements Engineering und Projektmanagement: Erfahrungen mit der Suche nach Best Practices
No full textEric Knauss1, Andrea Herrmann2, Ralf Fahney3, Thomas Gartung , Jörg Glunde5, Anne Hoffmann6, Uwe Valentini7, Rüdiger Weißbach8 1 University of Victoria, [email protected] 2 Freie Software Engineering Trainerin und Forscherin, [email protected] 3 Fahney Anforderungsingenieurwesen GmbH, [email protected] 4 STRABAG Property and Facility Services GmbH, [email protected] 5 Zeppelin Baumaschinen GmbH, [email protected] 6 [email protected], 7 HOOD GmbH, [email protected] 8 Hochschule für Angewandte Wissenschaften Hamburg, [email protected]
Identity negative priming: a phenomenon of perception, recognition or selection?
No full textThe present study addresses the problem whether negative priming (NP) is due to information processing in perception, recognition or selection. We argue that most NP studies confound priming and perceptual similarity of prime-probe episodes and implement a color-switch paradigm in order to resolve the issue. In a series of three identity negative priming experiments with verbal naming response, we determined when NP and positive priming (PP) occur during a trial. The first experiment assessed the impact of target color on priming effects. It consisted of two blocks, each with a different fixed target color. With respect to target color no differential priming effects were found. In Experiment 2 the target color was indicated by a cue for each trial. Here we resolved the confounding of perceptual similarity and priming condition. In trials with coinciding colors for prime and probe, we found priming effects similar to Experiment 1. However, trials with a target color switch showed such effects only in trials with role-reversal (distractor-to-target or target-to-distractor), whereas the positive priming (PP) effect in the target-repetition trials disappeared. Finally, Experiment 3 split trial processing into two phases by presenting the trial-wise color cue only after the stimulus objects had been recognized. We found recognition in every priming condition to be faster than in control trials. We were hence led to the conclusion that PP is strongly affected by perception, in contrast to NP which emerges during selection, i.e., the two effects cannot be explained by a single mechanism
Event-related brain potential correlates of identity negative priming from overlapping pictures
No full textEvent-related potentials (ERPs) were obtained from an identity priming task, where a green target had to be selected against a superimposed red distractor. Several priming conditions were realized in a mix of control (CO), negative priming (NP), and positive priming (PP) trials. PP and NP effects in reaction times (RTs) were significant. ERP results conceptually replicate earlier findings of left-posterior P300 reduction in PP and NP trials compared to CO. This ERP effect may reflect the detection of prime-probe similarity corresponding to the concept of a retrieval cue. A novel finding concerned amplitude increase of the frontal late positive complex (LPC) in the order NP, CO, and PP. NP therefore seemed to induce brain activity related to cognitive control and/or memory processes, with reduced LPC amplitude indicating effortful processing. Overall, retrieval-based explanations of identity NP are supported.BMBF [01GQ0432
Response-Retrieval and Negative Priming: Encoding- and Retrieval-Specific Effects
No full textIn a recent debate concerning the origin of the negative priming (NP) effect, evidence for the involvement of retrieval processes during the prime episode has accumulated. Rothermund, Wentura, and De Houwer (2005) explain the effect as a product of a conflict between retrieved and current response. Since specific properties of the involved encoding and retrieval mechanisms were not investigated so far, we extend the response-retrieval framework by asking if encoding during prime processing and retrieval-specific processes during probe processing have a modulating influence on the priming effects. In an overlapping-picture task experiment with an explicit variation of the role of the objects in prime and probe, we reproduce the response-retrieval-specific Response-retrieval × Priming interaction but find a modulation caused by the role of the repeated object in the probe trial. This modulation manifests in a vanishing interaction when the repeated object is a distractor in the probe. We interpret these findings in support of the response-retrieval theory of NP and conclude that the retrieval mechanism is more flexible than previously believed since it is sensitive to relevance of the repeated object regarding the experimental task
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