We show the importance that the Lanczos invariant has in the study of 4 R embedded into 5 E , in the analysis of non-null constant vectors, and in the existence of the Lanczos potential for the Weyl tensor.
Extracochlear electrical stimulation was carried out in 7 patients. We used square-wave signals. Electrode positions at the oval and round window showed the lowest current thresholds. The threshold of sound sensations elicited by electrical stimulation was higher in the high frequency than in the low frequency range. All 7 patients had hearing sensations… (More)