**7. Acknowledgement**

V. Niederkinkhaus and S. Mohanasundaram were supported by fellowships from the International Graduate School of Neuroscience (IGSN) at the Ruhr University. We want to thank U. Eysel, the Physiological Institutes of the Universities of Bochum and Würzburg for lending us a luminance meter and audiometers, N.E. Meyer for help with the design of the visual-spatial orientation test, and H. Schatz, R.A. Deisz, M. Kreissl and B. Igelhorst for many helpful discussions.

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