a concerned reader writes:

I found the word [nulutative] in David Brin's "The Uplift War".

Among other important factors are [...] mental technique
(e.g. associative, extrapolative, intuitive, holographic,
or nulutative)...

I can find no other use or definition of the word, and since it appears here
in a list, there is no context from which to infer a precise meaning. If it
is a neologism, it is the only one in the book, if you don't count
presumable misspellings. Given Brin's prodigious use of pointedly obscure
words, it's reasonable to think that he may have unearthed this one rather
than invented it.