Summary of disorders of voluntary movement
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Transcript of Summary of disorders of voluntary movement
Summary of Disorders of Voluntary Movement
Laura H. Goldstein
Jin Hwa Kim Cognitive Science Program Seoul National University
Contents
Assessment of Apraxia
- Challenges to Assessment
- Methodology
- Pitfall in Assessment
Types of Apraxic Errors
- Spatial, Temporal, Content Errors & Others
Management & Treatment of Apraxia
- Restitutive approach
- Substitutive approach
- Specified treatment effects
The Assessment of Apraxia
1. Challenges to Assessment
- Absence of a widely used & well-standardized tool
- Focused on limb apraxia
- Not theoretically related to cognitive neuropsychological models of apraxia (Rothi et al., 1997)
2. Methodology
- Transitive (using objects) and intransitive (not using objects) movements
- Verbal instruction, imitation of examiner’s movement and real object handling
The Assessment of Apraxia (Cont’d)
3. Pitfall in Assessment
- When the patient is aphasic.. (to verbal instruction)
- Visual object agnosia
- Non-meaningful (more easily) vs. meaningful (De Renzi et al., 1980)
Types of Apraxic Errors
1. Spatial Errors
- Exaggerated
- Incorrect amplitude
- Incorrect orientation of limb to target object
- Use of body part as object
[Rothi et al., 1997]
Body Part As Object
[Goodglass & Kaplan, 1983; Poeck, 1986]
Symptom
- Hammering with a closed fist
- Moving one’s finger across teeth instead of holding toothbrush
Diagnosis
- Rare in adults
- For brain-damaged patients, highly suggestive of ideomotor apraxia (Poeck, 1986)
- However, it may be a sign of brain damage only if it occurs when real objects are presented for use. (Mozaz et al., 1993)
Types of Apraxic Errors (Cont’d)
2. Temporal Errors
- Sequence
- Timing
- Incorrect of cycles of movements
3. Content Errors
- Presence of non-related movements
- Perseveration of all or part of a previously performed movements
- Performance in the absence of the real or imagined tool
[Rothi et al., 1997]
Types of Apraxic Errors (Cont’d)
4. Others
- No response
- Unrecognizable response
- A very concrete response (?)
[Rothi et al., 1997]
Management & Treatment of Apraxia
1. Restitutive approach
- Being directed at those behaviors most likely to recover
2. Substitutive approach
- Being employed for those behaviors that are most likely to remain impaired beyond the initial recovery phase(e.g. self-verbalization, use of sequence pictures)
[Rothi, 1995]
Management & Treatment of Apraxia
3. Restitutive vs. substitutive
- Not known the time course of apraxia
- Not known the manageable aspects of apraxia
- However, generalization might occur more readily in the acute phase,
- substitutive approach might achieve better results to people with chronic apraxia. (Maher & Ochipa, 1997)
[Rothi, 1995]
Management & Treatment of Apraxia
4. Specified treatment effects
- Erroneous responses were immediately corrected, but was maintained to a higher level for the treated items. (Maher et al., 1991)
- In general, treatment of one error type did not lead to a reduction of other error types,
- and improvement was specific to the gestures undergoing treatment. (Ochipa et al., 1995)
- Select tasks on the basis of their functional significance and train in their everyday environment.