Based on the experiments conducted, the f(x) function seems to output higher values for words related to more abstract concepts, particularly those with positive connotations, such as curiosity, justice, and friendship. The function also appears to assign lower values to concrete objects, emotions, and other unrelated categories of words.

[DESCRIPTION]: The function f(x) is selective for abstract or conceptual words, with a preference for positive connotations. It tends to output lower values for concrete objects, emotions, and other unrelated categories of words.