Kernrechtsfrage
Whether the revision of the whole disability pension to a three-quarters pension was justified under Art. 17 ATSG.
Extrahierter Entscheid
The reduction was not justified because the later medical assessment reflected a different diagnosis and evaluation of substantially unchanged symptoms, not a legally relevant change in health status.
Extrahierte Begründung
Revision requires a significant change in the material facts compared with the original pension decision. The cantonal court could reasonably treat the later report as an alternative assessment of the same neuropsychological complaints rather than proof of an actual improvement.