It has been proposed that formal thought disorder relates to neurocognition via semantic memory. Semantic network impairment in people with schizophreniameasured by the difference between fluency (number of animals' names produced in 60 seconds) and phonological fluency (number of words beginning with "F" produced in 60 seconds)predicts severity of formal thought disorder, suggesting that verbal information (through semantic priming) is unavailable. Other hypotheses include working memory deficit (being confused about what has already been said in a conversation) and attentional focus.