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Motor impersistence is the inability to maintain postures or positions (such as keeping eyes closed, protruding the tongue, maintaining conjugate gaze steadily in a fixed direction, or making a prolonged “ah” sound) without repeated prompts. Simultanapraxia, a subset of motor impersistence, has been defined as the inability to perform more than two of the simple voluntary acts simultaneously, such as closing the eyes and protruding the tongue. According to research (Kertesz, Nicholson, Cancelliere, Kassa, & Black, 1985; Rosse & Ciolino, 1986; Stuss, Delgado, & Guzman, 1987), it is most likely seen in patients with right frontal damage. Joynt, Benton, and Fotel (Joynt, Benton, & Fogel, 1962) developed a standardized objective test to measure motor impersistence.
References and Readings
- Stuss, D. T., Delgado, M., & Guzman, D. A. (1987). Verbal regulation in the control of motor impersistence: A proposed rehabilitation procedure. Neurorehabilitation and Neural Repair, 1(1), 19–24.Google Scholar