منابع مشابه
Continuous carry-over designs for fMRI.
This paper describes continuous carry-over fMRI experiments. In these studies, stimuli are presented in an unbroken, sequential manner, and can be used to estimate simultaneously the mean difference in neural activity between stimuli as well as the effect of one stimulus upon another (carry-over effects). Neural adaptation, which has been the basis of many recent fMRI studies, is shown to be a ...
متن کاملOn optimal cross-over designs when carry-over effects are proportional to direct effects
There are a number of different models for cross-over designs which take account of carry-over effects. Since it seems plausible that a treatment with a large direct effect should generally have a larger carry-over effect, Kempton, Ferris and David (2001) considered a model where the carry-over effects are proportional to the direct effects. The advantage of this model lies in the fact that the...
متن کاملEfficient crossover designs in the presence of interactions between direct and carry-over treatment effects
Crossover designs, or repeated measurements designs, are used for experiments in which t treatments are applied to each of n experimental units successively over p time periods. Such experiments are widely used in areas such as clinical trials, experimental psychology and agricultural field trials. In addition to the direct effect on the response of the treatment in the period of application, t...
متن کاملDesigning a stepped wedge trial: three main designs, carry-over effects and randomisation approaches
BACKGROUND There is limited guidance on the design of stepped wedge cluster randomised trials. Current methodological literature focuses mainly on trials with cross-sectional data collection at discrete times, yet many recent stepped wedge trials do not follow this design. In this article, we present a typology to characterise the full range of stepped wedge designs, and offer guidance on sever...
متن کاملNeural basis of carry-over effect during intertemporal choice: Preliminary results of an fMRI study
Background: Previous anthropological studies suggested that altruistic punishment is important for sustaining cooperation in large groups. In the clinical literature, major depressive disorder (MDD) has been associated with guilt driven pathological altruism. However, previous neuroeconomical studies suggested that altruism in MDD does not include forms of altruistic punishment. Methods: We use...
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ژورنال
عنوان ژورنال: NeuroImage
سال: 2007
ISSN: 1053-8119
DOI: 10.1016/j.neuroimage.2007.02.005