Visual perseveration is synonymous with palinopsia. It is a type of Perseveration. Types of speech errors include&colon; exchange errors, perseveration, anticipation, shift, substitution, blends, additions, and deletions. A patient with dementia might also experience thought perseveration. Secondary symptoms (perseveration, sensory-processing problems, etc.) may also exist. Perseveration of thought indicates an inability to switch ideas or responses. Stuck-in-set perseveration is most often seen in dysexecutive syndrome. Perseveration is also often seen in patients with DES. Perseveration is a common communicative and behavioral characteristic in FXS. Perseveration may explain why some patients appear to have obsessive-compulsive disorder. Perseveration is the repetition of thoughts, behaviours, or actions after they have already been completed.