Apraxia

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Parul Pahal, M.B.B.S[2] Norina Usman, M.B.B.S[3]


Synonyms and keywords: Dyspraxia

Overview

Praxis, a Greek work for act, work, or deed, is the ability to perform the learned movements. It usually comprises of three components, namely, ideation (what to do), motor planning (how to do), and execution (performing the movement correctly), that results in purposeful movements. Apraxia, however, is the inability to execute these skilled and learned purposeful movements when there is a breakdown in any component of praxis. This disorder makes it difficult to perform daily tasks and negatively impact the quality of life. Apraxia, a complex neurological disorder, with cognitive-motor dysfunction may be acquired or developmental. It can occur as a result of brain trauma/disease, and higher motor functional neuronal pathways damage in the setting of preserved comprehension, coordination, motivation, and elementary sensory and motor systems. The most common types of apraxia are 'Ideational' and 'Ideomotor'.

Historical Perspective

  • Steinthal introduced the term apraxiae (Greek word meaning inaction) in 1871. However, a German physician, Hugo Lipmann first established the conceptual knowledge and published complete description of apraxia after studying the gestures in a 48-year old stroke patient who had a left hemispheric stroke.[1]
  • Lipmann noticed that, despite of resolution of the paresis, the patient was unable to perform tasks such as buttoning the shirt, with no affect on spontaneous movements, and doing simple tasks on command. He observed this phenomenon specifically in patients with left hemispheric lesions. He also concluded that the planning of the motor movements occurs in the motor area of the left side of the brain. Lipmann further proposed that the 'praxis' information flows from the posterior brain areas (parietal and occipital lobes) to the anterior (motor cortex).
  • The major subtypes classified by Lipmann were ideational, ideomotor, and limb-kinetic apraxia.
  • One of the behavioral neurologist, Norman Geschwind, presented that the superior longitudinal fasciculus involvement disconnects the Wernicke's area are from the left premotor cortex, leading to 'apraxia'[2]

Classification


 
 
 
 
 
 
 
 
 
 
 
 
APRAXIA[3]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Ideomotor
 
Ideational
 
Limb-kinetic
 
Constructional
 
Speech
 
Gait
 
Task-specific apraxia



  • Ideomotor apraxia:
    • Most common type of apraxia.
    • Decreased performance of skilled motor performances despite integral language, sensory and motor function.
    • Seen more frequently in neurodegenerative disorders and stroke patients.
    • It can be classically demonstrated when a patient questioned verbally to make a motion with a limb. Patients with Ideomotor apraxia display spatial and temporal errors, inconvenient timing, amplitude, sequencing, configuration, limb position in space.
    • It is an inability to carry out, learned motor acts, command, adequate motor, and sensory abilities.
    • Ideomotor apraxia can be due to cerebral damage in numerous areas, including the left parietal lobe, the intrahemispheric association fibers, the dominant hemisphere motor association cortex, and the anterior corpus callosum.
    • Patients often use their arm as an object relatively than indicating how to use the object . Patients are frequently able to achieve the same acts without struggle in their daily lives. This process has been called the "voluntary-automatic dissociation".
    • These patients have a deficiency in their skill to plan or ample motor actions that depend on semantic memory. They can describe how to achieve a response, but incapable to "imagine" or do the movement. Though the capability to perform an act inevitably when cued remains complete, this is recognized as automatic-voluntary dissociation.In Ideomotor apraxia, there is difficulty or inability to execute familiar or learned movements on command despite of understanding the command and willingness to perform that action. The characteristic of this type of apraxia is the inability to a transitive movement. For example, the person can describe how a tool such as comb is used, but, when asked to use that tool, he is unable to perform the task (i.e. combing the hair) using the comb[4][5][6][7]
  • Ideational apraxia:
    • like the name depicts, problem in conceptualization of the task.
    • The person may be able to name the objects correctly but fails to coceptualize how that object is used.
    • inability to create a plan for or idea of a specific movement, for example, "pick up this pen and write down your name"
  • Constructional apraxia:
    • It is a condition resulting from neurological damage, which is demonstrated by the inability to construct and copy to command two- and three-dimensional stimuli.
    • Constructional apraxia has been a classic sign of a parietal lobe lesion, and as a valuable tool to escalate the spatial abilities functioned by this lobe.
    • It has become gradually clear that Constructional apraxia is a complex construct that can be observed with very different tasks that are only slightly interrelated, and hit various kinds of visuospatial, attentional, perceptual, planning, and motor mechanisms.
    • The patient with constructional apraxia is unable to construct, draw, or copy simple configurations; for example, intersecting shapes; they have trouble drawing basic shapes or copying a simple diagram[8].
    • inability to draw or construct simple configurations
  • Buccofacial or orofacial apraxia:
    • This is the most common type of apraxia.
    • These patients cannot convey facial movements on requests, such as voluntary movements of the tongue, cheeks, lips, pharynx, or larynx on command, for example, include licking lips, whistling, coughing, or winking).
  • Limb-kinetic apraxia:
    • It is the failure to make precise movements with an arm, finger, or leg. For example, a person may have trouble tying their shoes, waving hello, or typing on a computer.
    • inability to make fine, precise movements with a limb
  • Gait apraxia:
    • Apraxia of gait is a rare locomotion syndrome categorized by the incapability of lifting the feet from the floor regardless of discontinuous stepping action.
    • The accountable site of lesions is in the basal ganglia and frontal lobe[9].
  • Task-specific apraxia:
    • These include-
      • Sitting apraxia
      • Dressing apraxia
      • Eyelid opening apraxia
      • oculomotor (difficulty moving the eye)
  • verbal (difficulty planning the movements necessary for speech), also known as Apraxia of Speech. Apraxia may be accompanied by a language disorder called aphasia.
    • Developmental Apraxia of Speech (DAS) presents in children who have no evidence of difficulty with strength or range of motion of the articulators, but are unable to execute speech movements because of motor planning and coordination problems. This is not to be confused with phonological impairments in children with normal coordination of the articulators during speech.
    • Symptoms of Acquired Apraxia of Speech (AOS) and Developmental Apraxia of Speech (DAS) include inconsistent articulatory errors, groping oral movements to locate the correct articulatory position, and increasing errors with increasing word and phrase length. AOS often co-occurs with Oral Apraxia (during both speech and non-speech movements) and Limb Apraxia.

Pathophysiology

  • 'Praxis' comprises three components, which include ideation, motor planning, and execution to carry out the purposeful movement. There are particular regions of the brain that represent specific component functions, and these regions together work as a ‘praxis system’ to process and execute a purposeful movement. Dysfunction in any of these regions, namely, frontal and parietal cortex, basal ganglia, and the white matter which connects theses areas, leads to apraxia.
  • The movements which requires tools are transitive movements, and the ones which do not require tools are intransitive. The intransitive movements are gestural which can be meaningful (communicative), or meaningless movements (not representational). In apraxia, transitive movements are affected more frequently as compared to intransitive movements.[10][11]
  • The observations of the patients in the clinical practice is the basis of most of the knowledge about 'apraxia'. Apraxia has been mostly seen in chronic left hemispheric lesions and Alzheimer's disease.[12][13][14][15] The left hemispheric lesions cause more difficulty to perform transitive movements, as compared to intransitive movements and imitating gestures. Left hemisphere has a major role in 'praxis' and this may be due to specific stored representations in left hemisphere and their retrieval.[16] On the other hand, Alzheimer's patients have preserved transitive movements, but shows deficits in gestures.[15][17][18] Therefore, the type of apraxia depends on the type of neurological disease and the area of the brain affected by it.
  • Different brain regions which have role in cognition and movement are involved in complex 'Praxis' movements. The conceptualization of a purposeful task involves prefrontal, left premotor, middle temporal and parietal areas of the brain.[19]
  • Neuroimaging studies have been done to investigate praxis correlations, but studies done so far vary widely on focus areas of praxis. One of the study reported left temporal lobe correlation with praxis because of its role in somatic memory retrieval.[20][21][22] Left premotor cortex, left parietal lobule, and parietal cortex have also been shown to have a role in praxis as they are involved in knowledge of tools and their use,[23][24][25] grasping movements,[20][26][27][28] and spatiotemporal information integration,[27][29] respectively. Stronger left lateralization (especially posterior parietal and premotor cortex) for gesture production in praxis has been suggested by neuroimaging studies.[23][30][31]

Causes

Epidemiology and Demographics

  • The information available on the incidence of apraxia in adults is limited.
  • As apraxia is most common in children, the incidence is approximately 1 to 2 children per 1,000 (0.1%–0.2%) worldwide.
  • Prevalence rates of  apraxia range among 0 and 34% for patients with Right hemisphere stroke and 28–57% for patients with Left hemisphere stroke.Real tool-use loss prevalence rates were stated with 25–54% impaired level of patients.
  • Apraxia commonly affects individuals older than 50 years of age. Apraxia affects men and women equally[33][34][35]

Differentiating Apraxia from Other Diseases


Childhood apraxia of speech (CAS) Neuropraxia Dyspraxia Dysarthria Aphasia
CAS is a neurological childhood speech disease in which the consistency and precision of speech movements are weakened without neuromuscular deficits. CAS is also known as verbal dyspraxia or developmental apraxia [36]. Neuropraxia is the disease of traumatic peripheral nerve injury. It is categorized by focal segmental demyelination at the injury site, which results in obstruction of nerve conduction and transient paresthesia or weakness [37]. Dyspraxia is defined as the breakdown of actions and the inability to apply voluntary motor activities effectively in all parts of life from play to organized, skilled responsibilities [38]. Dysarthria is a motor speech illness and is associated with troubles of laryngeal function, respiration, articulation, and airflow direction leading to difficulties of speech intelligibility and quality [39]. Aphasia is a condition having trouble with the formulation and comprehension of language triggered by dysfunction in the precise brain region [36].

Risk Factors

Screening

There is insufficient evidence to recommend routine screening for apraxia.

Natural History, Complications, and Prognosis

Natural History:
  • The symptoms of apraxia typically develop during early or later years depending on the cause and the location affected.
  • Often, patients with apraxia are not aware of their shortfalls. Therefore, the history of a patient's capability to accomplish skilled movements should be obtained from the patient's caregiver or the patient himself.
  • Caregivers should be asked about the capability of patients to perform activities of daily living and perform tasks involving household tools such as using a toothbrush, knife, and fork appropriately, using kitchen utensils correctly and safely to prepare a meal; using tools such as scissors or hammer correctly.
  • Caregivers should also be asked about the whole activity level of the patient and whether decreases in his or her total actions have happened.
  • The patient may sit on the couch and watch television without showing interest in essential activities he or she use to do in the past.
  • This indifference can be related to many kinds of brain dysfunction, but it sporadically occurs because the patient is incapable of performing his or her usual activities[40].

Complications

  • Common complications of apraxia include:
Prognosis
  • Patients with apraxia are not able to do things independently and may distress carrying out everyday responsibilities. Activities should be avoided that can lead to injury and take the appropriate safety actions. Over-all, patients with apraxia rely on others for their daily activities and need at least some notch of command; skilled nursing care may be obligatory. Patients with the tumor or degenerative diseases usually develop into amplified levels of dependence[41].
  • The prognosis for individuals with apraxia varies. With therapy, some patients improve significantly, while others may show very little improvement. Some individuals with apraxia may benefit from the use of a communication aid.

Diagnosis

  • Many tests have been developed to evaluate apraxia but most are difficult to apply in clinics as they are not rapid tests. Additionally, most of those lack in sensitivity and validity.
    • De Renzi ideomotor apraxia test[42] for ideomotor apraxia assessment, can be tested in either side brain damage. It is a 24-item scale test.
    • Test of upper limb apraxia (TULIA)[43] is a 48 item test, is preferred test as it has a good validity and reliability. It can be used to test-
      • non-symbolic (meaningless)
      • intransitive (communicative)
      • transitive (tool-related) gestures.20
    • Apraxia Screen of TULIA (AST)[43] is a short bedside test with 12 items, with a high sensitivity and specificity. The basis of this test is TULIA test.

History and Symptoms:

Physical Examination

Physical examination of patients with Apraxia is usually dependent on what type of Apraxia they have for example Ideomotor apraxia, Buccofacial apraxia, and Constructional apraxia.

Ideomotor apraxia
  • Patients with ideomotor apraxia are tested based on the physical examination performed at the bedside with simple tests for the capability to use tools.
  • For example, the patients cannot hammer a nail into the (unreal) wall in front of them; patients are given a pair of scissors to cut a piece of paper.
  • However, different pantomimes could be made, including cutting with a saw, brushing teeth, peeling a potato or whipping eggs with an eggbeater.
  • Any error in carrying out the above activities indicates a loss of familiarity about the movement to be completed.
  • The response is recorded as an error[44].
Buccofacial apraxia
  • Patients cannot do skilled actions.
Constructional apraxia
  • Failure to copy or draw quality images.
  • Localizes lesions involving frontal or parietal area.

Laboratory Findings:

Electrocardiogram

There are no ECG findings associated with apraxia.

X-ray

There are no x-ray findings associated with apraxia.

Echocardiography and Ultrasound

There are no echocardiography/ultrasound findings associated with apraxia.

CT scan

Brain CT scan may be helpful in the diagnosis of apraxia to evaluate for possible mass lesion or atrophy

MRI

Brain MRI may be helpful in the diagnosis of apraxia. Findings on MRI diagnostic of apraxia include atrophy, ischemic changes, and mass lesion.

Other Imaging Findings

There are no other imaging findings associated with apraxia.

Other Diagnostic Studies

Diagnostic study PET may be helpful in the diagnosis of apraxia.

Treatment

  • Generally, treatment for individuals with apraxia includes physical therapy, occupational therapy or speech therapy, or Oral Motor Therapy and IVIG. If apraxia is a symptom of another disorder (usually a neurologic disorder), the underlying disorder should be treated.
  • No standardized treatment is available for apraxia. The frequency of limb apraxia in left hemispheric stroke patients is reported to be nearly 51%, and, hence, the therapeutic efforts are so far mostly concentrated towards stroke patients (left hemispheric stroke patients). Based on the studies, following treatment modalities have been considered so far-
    • Rehabilitative treatment[45][46]- 30 sessions, each lasting 50 minutes, 3 times weekly have been tried.[45]
    • Behavioral training Program-These include gesture-production exercises.[46]
  • With treatment, an improvement in praxis and daily living activities is seen in apraxia patients, based on some studies. The communicative gestures training has led to significant improvement of the gestures which were practiced during the training sessions, with some unpracticed gestures also showing some improvement.[47] However, the sustainability of these positive results is not clear. Although rehabilitative training has been reported to benefit, but, for sustained benefit, training alone is not sufficient.
  • Noninvasive brain stimulation- This method had been used widely for many neurological disorders, but there is very limited data for its use in cognitive disorders. However, some studies have shown that this technique has been tried for therapeutic and investigational purpose for this complex neurological disorder and may show some positive results. This technique when used with rehabilitative training, may be useful. Through this technique and different stimulation settings, inhibitory or excitatory influences are exerted on cortical excitability or plasticity.[48] The synergistic approach using this technique prior to rehabilitative training, not only increases the efficacy, but it also increases the sustainability of the improvement seen. Some examples of non-invasive brain stimulation techniques which have been used in some neurological conditions with some improvement in the cognitive function components of the disease can be tried-
    • Transcranial direct current stimulation (tDCS)[49]-low-level continuous electric current is delivered to influence plasticity and excitabililty of the cortex. In this, anodal tDCS works in excitatory ways, and cathodal tDCS in inhibitory ways.
    • single-pulse or rTMS[50]- It can be delivered in either low frequency (0.2–1 Hz) for inhibitory mode, or in high frequency (≥5 Hz) for excitatory mode.
    • theta-burst stimulation (TBS)[51]-It is also a magnetic stimulation method like rTMS, but it shows equal efficacy even with shorter stimulation period.
    • paired associative stimulation (PAS)[52]- This stimulation technique can be used to tackle physiological mechanisms underlying memory using long-term depression (LTD), and long-term potentiation (LTP).

Medical Therapy

Interventions

There are no specific recommended therapeutic interventions for the management of Apraxia[53][54][55][56]

Apraxia is believed to have an adverse impact on the Activity of Daily Living independence. There are limited information and research available regarding various treatments</ref>. Various interventions include:

  • Daily living doings training: this method explains internal and external compensatory approaches that permit a functional mission to be accomplished.
  • Sensory Stimulation: Including deep pressure stimulation, soft and sharp touch are useful to the patients' limbs.
  • Chaining (forward or backward): This method is fragmented down into its sections. The task is done with assistance from the therapist separately from the final element through backward chaining, which the patient performs out unassisted. If positive next time, additional steps are presented. Forward chaining is the opposite of backward chaining;
  • Proprioceptive stimulation: The patient props on and puts his weight through their upper and lower extremities;
  • Cueing, physical or verbal stimuli: This technique enables each phase of the task to be completed

Surgery

Surgical intervention is not recommended for the management of Apraxia.

Primary Prevention

There are no established measures for the primary prevention of Apraxia. Some steps can be used which include[57].

  • Exercise regularly.
  • Eat a healthy diet.
  • Limit how much alcohol you drink.
  • Quit smoking
  • Check your blood pressure often.

Secondary Prevention

Effective measures for the secondary prevention of Apraxia include secondary prevention of stroke[58].

  • Aspirin, clopidogrel, extended-release dipyridamole, ticlopidine
  • Anticoagulants (apixaban, dabigatran, edoxaban, rivaroxaban, warfarin)
  • Blood pressure-lowering medications.
  • Diabetes Control
  • Low-fat diet
  • Cholesterol-lowering medications, Cessation of cigarette smoking, carotid revascularization
  • Weight loss and Exercise

Related Chapters

References

  • Epstein, O. (2003). Clinical Examination. London: Mosby. p. 294. ISBN 0-7234-3229-5. Unknown parameter |coauthors= ignored (help)
  • Kasper DL, Braunwald E, Fauci AS, Hauser SL, Longo DL, Jameson JL. Harrison's Principles of Internal Medicine. New York: McGraw-Hill, 2005. ISBN 0-07-139140-1.

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  1. ↑ . PMID 19886110. Missing or empty |title= (help)
  2. ↑ Geschwind, Norman (1965). "DISCONNEXION SYNDROMES IN ANIMALS AND MAN". Brain. 88 (3): 585–585. doi:10.1093/brain/88.3.585. ISSN 0006-8950.
  3. ↑ Heilman, Kenneth M. (2010). "APRAXIA". CONTINUUM: Lifelong Learning in Neurology. 16: 86–108. doi:10.1212/01.CON.0000368262.53662.08. ISSN 1080-2371.
  4. ↑ <ref name="pmid1115438">Geschwind N (1975). "The apraxias: neural mechanisms of disorders of learned movement". Am Sci. 63 (2): 188–95. PMID 1115438.
  5. ↑ Schnider A, Hanlon RE, Alexander DN, Benson DF. Ideomotor apraxia: behavioral dimensions and neuroanatomical basis. Brain Lang. 1997;58(1):125-136. doi:10.1006/brln.1997.1770
  6. ↑ <ref name="pmid8292325">Rapcsak SZ, Ochipa C, Beeson PM, Rubens AB (1993). "Praxis and the right hemisphere". Brain Cogn. 23 (2): 181–202. doi:10.1006/brcg.1993.1054. PMID 8292325.
  7. ↑ <ref name="pmid82923253">Rapcsak SZ, Ochipa C, Beeson PM, Rubens AB (1993). "Praxis and the right hemisphere". Brain Cogn. 23 (2): 181–202. doi:10.1006/brcg.1993.1054. PMID 8292325.
  8. ↑ <ref name="pmid8174333">Yanagisawa N, Ueno E, Hayashi R, Tokuda T, Takou K (1993). "[Apraxia of [[gait]] and disorders in posture and locomotion]". Rinsho Shinkeigaku. 33 (12): 1310–2. PMID 8174333. URL–wikilink conflict (help)
  9. ↑ <ref name="pmid8174333">Yanagisawa N, Ueno E, Hayashi R, Tokuda T, Takou K (1993). "[Apraxia of gait and disorders in posture and locomotion]". Rinsho Shinkeigaku. 33 (12): 1310–2. PMID 8174333.
  10. ↑ Roy, Eric A.; Square-storer, Paula; Hogg, Sharon; Adams, Scott (2009). "Analysis of task demands in Apraxia". International Journal of Neuroscience. 56 (1–4): 177–186. doi:10.3109/00207459108985414. ISSN 0020-7454.
  11. ↑ . PMID 10456799. Missing or empty |title= (help)
  12. ↑ Buxbaum, Laurel J.; Johnson-Frey, Scott H.; Bartlett-Williams, Megan (2005). "Deficient internal models for planning hand–object interactions in apraxia". Neuropsychologia. 43 (6): 917–929. doi:10.1016/j.neuropsychologia.2004.09.006. ISSN 0028-3932.
  13. ↑ Buxbaum, Laurel J.; Shapiro, Allison D.; Coslett, H. Branch (2014). "Critical brain regions for tool-related and imitative actions: a componential analysis". Brain. 137 (7): 1971–1985. doi:10.1093/brain/awu111. ISSN 1460-2156.
  14. ↑ Baumard, Josselin; Lesourd, Mathieu; Jarry, Christophe; Merck, Catherine; Etcharry-Bouyx, Frédérique; Chauviré, Valérie; Belliard, Serge; Moreaud, Olivier; Croisile, Bernard; Osiurak, François; Le Gall, Didier (2016). "Tool use disorders in neurodegenerative diseases: Roles of semantic memory and technical reasoning". Cortex. 82: 119–132. doi:10.1016/j.cortex.2016.06.007. ISSN 0010-9452.
  15. ↑ 15.0 15.1 Jarry, Christophe; Osiurak, François; Besnard, Jérémy; Baumard, Josselin; Lesourd, Mathieu; Croisile, Bernard; Etcharry-Bouyx, Frédérique; Chauviré, Valérie; Le Gall, Didier (2016). "Tool use in left brain damage and Alzheimer's disease: What about function and manipulation knowledge?". Journal of Neuropsychology. 10 (1): 154–159. doi:10.1111/jnp.12097. ISSN 1748-6645.
  16. ↑ Wheaton, Lewis A.; Hallett, Mark (2007). "Ideomotor apraxia: A review". Journal of the Neurological Sciences. 260 (1–2): 1–10. doi:10.1016/j.jns.2007.04.014. ISSN 0022-510X.
  17. ↑ Lesourd, Mathieu; Le Gall, Didier; Baumard, Josselin; Croisile, Bernard; Jarry, Christophe; Osiurak, François (2013). "Apraxia and Alzheimer's Disease: Review and Perspectives". Neuropsychology Review. 23 (3): 234–256. doi:10.1007/s11065-013-9235-4. ISSN 1040-7308.
  18. ↑ Ochipa, Cynthia; Rothi, Leslie J. Gonzalez; Heilman, Kenneth M. (1992). "CONCEPTUAL APRAXIA IN ALZHEIMER'S DISEASE". Brain. 115 (4): 1061–1071. doi:10.1093/brain/115.4.1061. ISSN 0006-8950.
  19. ↑ Tranel, Daniel; Kemmerer, David; Adolphs, Ralph; Damasio, Hanna; Damasio, Antonio R. (2010). "NEURAL CORRELATES OF CONCEPTUAL KNOWLEDGE FOR ACTIONS". Cognitive Neuropsychology. 20 (3–6): 409–432. doi:10.1080/02643290244000248. ISSN 0264-3294.
  20. ↑ 20.0 20.1 Choi, Seong; Na, Duk; Kang, Eunjoo; Lee, Kyung; Lee, Soo; Na, Dong (2001). "Functional magnetic resonance imaging during pantomiming tool-use gestures". Experimental Brain Research. 139 (3): 311–317. doi:10.1007/s002210100777. ISSN 0014-4819.
  21. ↑ Beauchamp, Michael S.; Lee, Kathryn E.; Haxby, James V.; Martin, Alex (2002). "Parallel Visual Motion Processing Streams for Manipulable Objects and Human Movements". Neuron. 34 (1): 149–159. doi:10.1016/S0896-6273(02)00642-6. ISSN 0896-6273.
  22. ↑ Chao, Linda L.; Haxby, James V.; Martin, Alex (1999). "Attribute-based neural substrates in temporal cortex for perceiving and knowing about objects". Nature Neuroscience. 2 (10): 913–919. doi:10.1038/13217. ISSN 1097-6256.
  23. ↑ 23.0 23.1 Frey, Scott H. (2007). "What Puts the How in Where? Tool Use and the Divided Visual Streams Hypothesis". Cortex. 43 (3): 368–375. doi:10.1016/S0010-9452(08)70462-3. ISSN 0010-9452.
  24. ↑ Ebisch, Sjoerd J. H.; Babiloni, Claudio; Del Gratta, Cosimo; Ferretti, Antonio; Perrucci, Mauro G.; Caulo, Massimo; Sitskoorn, Margriet M.; Romani, Gian Luca (2007). "Human Neural Systems for Conceptual Knowledge of Proper Object Use: A Functional Magnetic Resonance Imaging Study". Cerebral Cortex. 17 (11): 2744–2751. doi:10.1093/cercor/bhm001. ISSN 1460-2199.
  25. ↑ Canessa, N.; Borgo, F.; Cappa, S. F.; Perani, D.; Falini, A.; Buccino, G.; Tettamanti, M.; Shallice, T. (2007). "The Different Neural Correlates of Action and Functional Knowledge in Semantic Memory: An fMRI Study". Cerebral Cortex. 18 (4): 740–751. doi:10.1093/cercor/bhm110. ISSN 1047-3211.
  26. ↑ Vingerhoets, Guy; Acke, Frederic; Vandemaele, Pieter; Achten, Eric (2009). "Tool responsive regions in the posterior parietal cortex: Effect of differences in motor goal and target object during imagined transitive movements". NeuroImage. 47 (4): 1832–1843. doi:10.1016/j.neuroimage.2009.05.100. ISSN 1053-8119.
  27. ↑ 27.0 27.1 Watson, Christine E.; Buxbaum, Laurel J. (2015). "A distributed network critical for selecting among tool-directed actions". Cortex. 65: 65–82. doi:10.1016/j.cortex.2015.01.007. ISSN 0010-9452.
  28. ↑ Ogawa, Kenji; Imai, Fumihito (2016). "Hand-independent representation of tool-use pantomimes in the left anterior intraparietal cortex". Experimental Brain Research. 234 (12): 3677–3687. doi:10.1007/s00221-016-4765-7. ISSN 0014-4819.
  29. ↑ Assmus, Ann; Marshall, John C; Ritzl, Afra; Noth, Johannes; Zilles, Karl; Fink, Gereon R (2003). "Left inferior parietal cortex integrates time and space during collision judgments". NeuroImage. 20: S82–S88. doi:10.1016/j.neuroimage.2003.09.025. ISSN 1053-8119.
  30. ↑ Bohlhalter, S.; Hattori, N.; Wheaton, L.; Fridman, E.; Shamim, E. A.; Garraux, G.; Hallett, M. (2008). "Gesture Subtype-Dependent Left Lateralization of Praxis Planning: An Event-Related fMRI Study". Cerebral Cortex. 19 (6): 1256–1262. doi:10.1093/cercor/bhn168. ISSN 1047-3211.
  31. ↑ Fridman, Esteban A.; Immisch, Ilka; Hanakawa, Takashi; Bohlhalter, Stephan; Waldvogel, Daniel; Kansaku, Kenji; Wheaton, Lewis; Wu, Tao; Hallett, Mark (2006). "The role of the dorsal stream for gesture production". NeuroImage. 29 (2): 417–428. doi:10.1016/j.neuroimage.2005.07.026. ISSN 1053-8119.
  32. ↑ <ref name="pmid15509449">McClain M, Foundas A (2004). "Apraxia". Curr Neurol Neurosci Rep. 4 (6): 471–6. doi:10.1007/s11910-004-0071-z. PMID 15509449.
  33. ↑ <ref name="pmid10768524">Smania N, Girardi F, Domenicali C, Lora E, Aglioti S (2000). "The rehabilitation of limb apraxia: a study in left-brain-damaged patients". Arch Phys Med Rehabil. 81 (4): 379–88. doi:10.1053/mr.2000.6921. PMID 10768524.
  34. ↑ <ref name="pmid31002018">Buchmann I, Dangel M, Finkel L, Jung R, Makhkamova I, Binder A; et al. (2020). "[Formula: see text] Limb apraxia profiles in different clinical samples". Clin Neuropsychol. 34 (1): 217–242. doi:10.1080/13854046.2019.1585575. PMID 31002018.
  35. ↑ "Childhood Apraxia of Speech: Incidence and Prevalence".
  36. ↑ 36.0 36.1 Looger LL, Hellinga HW (2001). "Generalized dead-end elimination algorithms make large-scale protein side-chain structure prediction tractable: implications for protein design and structural genomics". J Mol Biol. 307 (1): 429–45. doi:10.1006/jmbi.2000.4424. PMID 11243829.
  37. ↑ "StatPearls". 2020. PMID 32491678 Check |pmid= value (help).
  38. ↑ Gibbs J, Appleton J, Appleton R (2007). "Dyspraxia or developmental coordination disorder? Unravelling the enigma". Arch Dis Child. 92 (6): 534–9. doi:10.1136/adc.2005.088054. PMC 2066137. PMID 17515623.
  39. ↑ Enderby P (2013). "Disorders of communication: dysarthria". Handb Clin Neurol. 110: 273–81. doi:10.1016/B978-0-444-52901-5.00022-8. PMID 23312647.
  40. ↑ <ref name="pmid24795685">Bieńkiewicz MM, Brandi ML, Goldenberg G, Hughes CM, Hermsdörfer J (2014). "The tool in the brain: apraxia in ADL. Behavioral and neurological correlates of apraxia in daily living". Front Psychol. 5: 353. doi:10.3389/fpsyg.2014.00353. PMC 4005934. PMID 24795685.
  41. ↑ <ref name="pmid25936541">Civelek GM, Atalay A, Turhan N (2015). "Association of ideomotor apraxia with lesion site, etiology, neglect, and functional independence in patients with first ever stroke". Top Stroke Rehabil. 22 (2): 94–101. doi:10.1179/1074935714Z.0000000027. PMID 25936541.
  42. ↑ De Renzi, Ennio (1980). "Imitating Gestures". Archives of Neurology. 37 (1): 6. doi:10.1001/archneur.1980.00500500036003. ISSN 0003-9942.
  43. ↑ 43.0 43.1 Vanbellingen, T.; Kersten, B.; Van Hemelrijk, B.; Van de Winckel, A.; Bertschi, M.; Müri, R.; De Weerdt, W.; Bohlhalter, S. (2010). "Comprehensive assessment of gesture production: a new test of upper limb apraxia (TULIA)". European Journal of Neurology. 17 (1): 59–66. doi:10.1111/j.1468-1331.2009.02741.x. ISSN 1351-5101.
  44. ↑ <ref name="pmid26942323">Frenkel-Toledo S, Liebermann DG, Bentin S, Soroker N (2016). "Dysfunction of the Human Mirror Neuron System in Ideomotor Apraxia: Evidence from Mu Suppression". J Cogn Neurosci. 28 (6): 775–91. doi:10.1162/jocn_a_00936. PMID 26942323.
  45. ↑ 45.0 45.1 Smania, N.; Aglioti, S. M.; Girardi, F.; Tinazzi, M.; Fiaschi, A.; Cosentino, A.; Corato, E. (2006). "Rehabilitation of limb apraxia improves daily life activities in patients with stroke". Neurology. 67 (11): 2050–2052. doi:10.1212/01.wnl.0000247279.63483.1f. ISSN 0028-3878.
  46. ↑ 46.0 46.1 Smania, Nicola; Girardi, Flavia; Domenicali, Chiara; Lora, Elisa; Aglioti, Salvatore (2000). "The rehabilitation of limb apraxia: A study in left-brain–damaged patients". Archives of Physical Medicine and Rehabilitation. 81 (4): 379–388. doi:10.1053/mr.2000.6921. ISSN 0003-9993.
  47. ↑ Daumüller, Maike; Goldenberg, Georg (2009). "Therapy to improve gestural expression in aphasia: a controlled clinical trial". Clinical Rehabilitation. 24 (1): 55–65. doi:10.1177/0269215509343327. ISSN 0269-2155.
  48. ↑ Hallett, Mark (2007). "Transcranial Magnetic Stimulation: A Primer". Neuron. 55 (2): 187–199. doi:10.1016/j.neuron.2007.06.026. ISSN 0896-6273.
  49. ↑ Lefaucheur, Jean-Pascal; Antal, Andrea; Ayache, Samar S.; Benninger, David H.; Brunelin, Jérôme; Cogiamanian, Filippo; Cotelli, Maria; De Ridder, Dirk; Ferrucci, Roberta; Langguth, Berthold; Marangolo, Paola; Mylius, Veit; Nitsche, Michael A.; Padberg, Frank; Palm, Ulrich; Poulet, Emmanuel; Priori, Alberto; Rossi, Simone; Schecklmann, Martin; Vanneste, Sven; Ziemann, Ulf; Garcia-Larrea, Luis; Paulus, Walter (2017). "Evidence-based guidelines on the therapeutic use of transcranial direct current stimulation (tDCS)". Clinical Neurophysiology. 128 (1): 56–92. doi:10.1016/j.clinph.2016.10.087. ISSN 1388-2457.
  50. ↑ Lefaucheur, Jean-Pascal; André-Obadia, Nathalie; Antal, Andrea; Ayache, Samar S.; Baeken, Chris; Benninger, David H.; Cantello, Roberto M.; Cincotta, Massimo; de Carvalho, Mamede; De Ridder, Dirk; Devanne, Hervé; Di Lazzaro, Vincenzo; Filipović, Saša R.; Hummel, Friedhelm C.; Jääskeläinen, Satu K.; Kimiskidis, Vasilios K.; Koch, Giacomo; Langguth, Berthold; Nyffeler, Thomas; Oliviero, Antonio; Padberg, Frank; Poulet, Emmanuel; Rossi, Simone; Rossini, Paolo Maria; Rothwell, John C.; Schönfeldt-Lecuona, Carlos; Siebner, Hartwig R.; Slotema, Christina W.; Stagg, Charlotte J.; Valls-Sole, Josep; Ziemann, Ulf; Paulus, Walter; Garcia-Larrea, Luis (2014). "Evidence-based guidelines on the therapeutic use of repetitive transcranial magnetic stimulation (rTMS)". Clinical Neurophysiology. 125 (11): 2150–2206. doi:10.1016/j.clinph.2014.05.021. ISSN 1388-2457.
  51. ↑ Wischnewski, Miles; Schutter, Dennis J.L.G. (2015). "Efficacy and Time Course of Theta Burst Stimulation in Healthy Humans". Brain Stimulation. 8 (4): 685–692. doi:10.1016/j.brs.2015.03.004. ISSN 1935-861X.
  52. ↑ Wischnewski, Miles; Schutter, Dennis J.L.G. (2016). "Efficacy and time course of paired associative stimulation in cortical plasticity: Implications for neuropsychiatry". Clinical Neurophysiology. 127 (1): 732–739. doi:10.1016/j.clinph.2015.04.072. ISSN 1388-2457.
  53. ↑ <ref name="Hagmann1998">Hagmann, Georg Goldenberg Sonja (1998). "Therapy of Activities of Daily Living in Patients with Apraxia". Neuropsychological Rehabilitation. 8 (2): 123–141. doi:10.1080/713755559. ISSN 0960-2011.
  54. ↑ <ref name="van HeugtenDekker2016">van Heugten, C M; Dekker, J; Deelman, B G; van Dijk, A J; Stehmann-Saris, J C (2016). "Outcome of strategy training in stroke patients with apraxia: a phase II study". Clinical Rehabilitation. 12 (4): 294–303. doi:10.1191/026921598674468328. ISSN 0269-2155.
  55. ↑ <ref name="pmid18254038">West C, Bowen A, Hesketh A, Vail A (2008). "Interventions for motor apraxia following stroke". Cochrane Database Syst Rev (1): CD004132. doi:10.1002/14651858.CD004132.pub2. PMC 6464830. PMID 18254038.
  56. ↑ <ref name="Butler2016">Butler, Jenny (2016). "Intervention Effectiveness: Evidence from a Case Study of Ideomotor and Ideational Apraxia". British Journal of Occupational Therapy. 60 (11): 491–497. doi:10.1177/030802269706001109. ISSN 0308-0226.
  57. ↑ <ref name="pmid2799873">"Stroke--1989. Recommendations on stroke prevention, diagnosis, and therapy. Report of the WHO Task Force on Stroke and other Cerebrovascular Disorders". Stroke. 20 (10): 1407–31. 1989. doi:10.1161/01.str.20.10.1407. PMID 2799873.
  58. ↑ <ref name="pmid26300647">Esenwa C, Gutierrez J (2015). "Secondary stroke prevention: challenges and solutions". Vasc Health Risk Manag. 11: 437–50. doi:10.2147/VHRM.S63791. PMC 4536764. PMID 26300647.
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