Abstract

The theoretical paper deals with the finding that the effectsize of nearly all psi-experiments shows a tendency to decline over time. Thus one gets the impression that experimental psi is not only a very small effect but also restricted in relation to repeatability. In spontaneous cases, however, large effect seem to occur. This seemingly paradoxical situation can be explained by applying the Model of Pragmatic Information (MPI) to backward causation and introducing a fractal dimension of time. For some special examples a precise mathematical definition is provided. Some experimental data are supportive to this approach.