Perseveration is the repetition of a particular response, such as a word, phrase, or gesture, despite the absence or cessation of a stimulus, usually caused by brain injury or other organic disorder. If an issue has been fully explored and discussed to a point of resolution, it is not uncommon for something to trigger the re-investigation of the matter. This can happen at any time during a conversation. This is particularly true with those who have had traumatic brain injuries. Several researchers have tried to connect perseveration with a lack of inhibition; however, this connection could not be found, or was small.