Impersistence is defined as a transitory existence or occurrence lasting only a short time. Impersistence is used with motor skill where motor impersistence is characterized by the inability to sustain a movement. The term is also used in memory when one is unable to correctly recall a recorded memory or thought. This term can be used for numerous areas such as task impersistence as being the inability to consistently complete a task. Motor impersistence is commonly assessed in neurodegenerative and some psychological disorders as well as stroke and other cerebrovascular conditions.