there are three patterns/ categories of perseveration:
1. "stuck-in-set" is the inability to switch over to a new set of responses and actions appropriate for a new task
2. "continuous perseveration" is the continuation of a particular act if uninterrupted by external factors
3. "recurrent perseveration" is the recurrence of a previously employed behavior or set of behaviors even in the presence/ face of a new stimulus or set of stimuli

Patterns of Perseveration

"Switching cost" can cause what is known as "perseveration". Perseveration is the involuntary continuation of a particular act or the involuntary maintenance of a particular reaction to a given stimulus.

Claremont Graduate University

A common manifestation in behavior that occurs in post-stroke aphasia is the presence of what is called "switching cost". This refers to a slower reaction time when switching tasks and a difficulty adjusting to new behaviors. 

"Switching Cost" in Aphasia

Cahana-Amitay, D., & Albert, M. L. (2015). Redefining recovery from aphasia. Oxford University Press. Retrieved July 9, 2022

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