The second definition was underlined. Although she had no conscious recollection of it, Kvavilashvili had evidently looked up the meaning of "hurdle" before. Somehow, she concluded, her subconscious knew that the word was relevant to her difficulty remembering the name of the useful statistical measure. She had just experienced what she and a few other psychologists call "mind-pops"—fragments of knowledge, such as words, images or melodies that drop suddenly and unexpectedly into consciousness.
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