It seems that sufficiently intelligent agent should be able to change sigma. Sufficiently advanced rover might be able to design and assemble new sensors in place, or advanced trading algorithm might look for a new relevant streams of data on the net, or strong AI might modify its sensory mechanisms in various ways. After all, human intelligences do it when they need new tools to make scientific discoveries.
It seems that sufficiently intelligent agent should be able to change sigma. Sufficiently advanced rover might be able to design and assemble new sensors in place, or advanced trading algorithm might look for a new relevant streams of data on the net, or strong AI might modify its sensory mechanisms in various ways. After all, human intelligences do it when they need new tools to make scientific discoveries.