The function f(x) appears to be selective for concepts related to emotions and abstract concepts. It assigns higher values closer to 1 for words like "sadness" and "happiness", indicating an association with emotional states. Additionally, words like "freedom" and "robot" also receive relatively higher values, suggesting an association with abstract ideas or futuristic concepts. On the other hand, words like "cat", "dog", "apple", "computer", and "table" receive lower values closer to 0, indicating a lack of association with the concepts targeted by the function. 

Please note that this is a preliminary description based on a limited set of test cases. To get a more accurate and comprehensive understanding of the function's behavior, it would be beneficial to perform additional experiments with a larger variety of words from different categories.