Abstract: Research from brain imaging showed that accurate FOK was composed of feeling-of-knowing and feeling-of-not-knowing, which might rely on different brain mechanism. This research examined the influence of the cue and the target on the accuracy of FOK, and the hypothesis on “it was possible that feeling-of-knowing and feeling-of-not-knowing were different cognitive processes” in two experiments. Results of the first experiment showed that the frequency of the target impacted on the accuracy of FOK judgments, that is, when the target was a low-frequency word, FOK judgments were inaccurate. And meanwhile the frequency of the cue and the target had no influence on Feeling-of-knowing and Feeling-of-not-knowing. Results of the second experiment showed that cue-familiarity affected on the accurate feeling-of- not-knowing, while partial access of the target had influence on accurate feeling-of- knowing. So we concluded that the frequency of the target impacted on the accuracy of FOK judgment, and provided evidence that Feeling-of-knowing and Feeling-of -not-knowing were different cognitive processes through behavior experiments.

Key words: Feeling-of-knowing, Feeling-of-not-knowing, dissociation