incoherence of thought

...The thought process is the process of analyzing and solving problems by judging and reasoning while sequentially thinking of ideas that fit a certain purpose. Disorders include inhibition of thought, blocking of thought, flight of ideas, incoherent thinking, and perseveration. Inhibition of ideas means that the flow of ideas is inhibited and does not go smoothly. Blocking of thought means that the flow of ideas is suddenly interrupted. Flight of ideas means that thoughts fly from one to the next and it is difficult to reach the goal. Incoherence of thought means that consciousness is clear but the thought process lacks cohesion and speech is incoherent. Incoherent thinking means incoherent speech when consciousness is impaired. Perseveration means that the previous answer is repeated even when the question is changed. Disorders of thought content include dominant ideas, obsessions, and delusions. ...

*Some terminology explanations that mention "incoherence of thought" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…思考過程とは，一定の目的に適合した観念を順次思い浮かべながら判断，推理などによって課題を分析，解決する過程であり，その障害には思考制止，思考途絶，観念奔逸，思考滅裂，思考散乱，保続などがある。思考制止inhibition of ideasとは思考の流れに抑制がかかってスムーズにいかないこと，思考途絶blocking of thoughtとは思考の流れが突然中断してしまうこと，観念奔逸flight of ideasとは考えが次から次へと飛んでなかなか目的に到達しないこと，思考滅裂incoherence of thoughtとは意識が清明であって思考過程にまとまりが欠け，話の筋が支離滅裂であること，思考散乱incoherent thinkingとは意識障害時の話の支離滅裂状態，保続perseverationとは質問が変わっても前の返事が繰り返されることをいう。　思考内容の障害には，優格観念，強迫観念，妄想がある。…

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出典｜株式会社平凡社世界大百科事典 第２版について | 情報