Based on the tests I ran on the function, here is the description of f(x):

[DESCRIPTION]:
The function f(x) seems to measure the level of association between the input word and a particular concept(s). It returns a value between 0 and 1, where a value closer to 1 indicates a stronger association with the concept.

The function does not seem to be selective for any specific concept based on the words I tested. The output values for all the words I tested were relatively low, ranging from 0.0017 to 0.0031. This suggests that the function assigns a small but non-zero association value to most words, but the values are not significantly influenced by the specific concept being tested.

It's possible that the selectivity of the function may require more specific or context-dependent input words to produce more pronounced results.