Ideomotor apraxia after stroke can make a familiar action unexpectedly difficult: a person may know exactly what a screwdriver is for yet be unable to show the turning movement when asked. Apraxia is a neurological problem with carrying out learned, purposeful actions. It is not explained by a primary loss of strength, sensation, coordination, or comprehension. Because it can interfere with washing, dressing, eating, writing, and using tools, a careful clinical assessment matters.
Apraxia after stroke is a problem of learned action
“Praxis” means the ability to perform learned or practiced movements. Apraxia is the loss of that ability. The person may understand an instruction and recognize every object involved, but the voluntary action does not come together in the needed way. That distinction is important after stroke, when several problems can affect movement at the same time.
About 30% of people show apraxia or dyspraxia after stroke, with a much higher frequency after a left hemisphere stroke. In one study, apraxia was found in 51.3% of people with a left-hemisphere stroke and 6.0% of those with a right-hemisphere stroke. Apraxia and aphasia also often occur together because both commonly involve the left hemisphere.
The left posterior parietal lobe, including the inferior parietal lobule and supramarginal gyrus, is a key area for stored movement representations and semantic memory for objects. Yet apraxia is not best understood as damage to one isolated spot. Praxis tasks activate a left-hemisphere parietal-premotor-motor network. A stroke affecting this network can disrupt the route from knowing an action to carrying it out.
The history of apraxia makes the everyday impact clear. Hugo Liepmann described a 48-year-old person with a left-hemisphere stroke who, after paralysis improved, could no longer button clothing or light a cigar. A movement problem can therefore remain even when an arm is no longer weak in the same way.
Ideomotor apraxia: when a gesture will not come on command
Ideomotor apraxia is the inability to perform a gesture on verbal command even though knowledge of the task remains intact. It is the most common apraxia subtype. Someone may be able to explain how a hole punch works but be unable to demonstrate the movement. The gap is between the intention or instruction and the correctly organized gesture, not necessarily between the person and the object’s purpose.
A useful example is a request to show how to turn a screw with a screwdriver. A person with ideomotor apraxia may recognize the tool and describe its use, but the hand position, direction, or rotation in the pantomime may be wrong. Another characteristic error is using a body part as if it were the object: when asked to pantomime brushing teeth, the person may use fingers as the toothbrush rather than represent holding a toothbrush.
Clinicians may see added movements, omitted movements, perseveration, substitution, or no response. A striking feature can be a dissociation between voluntary and automatic movement. An action may occur spontaneously in context but fail when the person is directly told to perform it. That pattern is one reason an evaluation looks beyond whether a person can move an arm or name a tool.
Ideomotor and ideational apraxia fail at different points
Ideational apraxia, also called conceptual apraxia, is different from ideomotor apraxia. In ideational apraxia, object recognition and naming are intact, but the concept of the action is disrupted. The person may recognize an envelope, a stamp, and an address, yet not know how those items belong together to mail a letter. Ideomotor apraxia, by contrast, preserves the idea of what should be done while disrupting the correct gesture on command.
| Feature | Ideomotor apraxia | Ideational apraxia |
|---|---|---|
| Main difficulty | Carrying out a known gesture correctly | Conceptualizing how objects belong in an action |
| Knowledge of the task | Preserved | Action concept disrupted |
| Object recognition and naming | May be intact | Intact |
| Typical example | Cannot demonstrate screwdriver use despite knowing its purpose | Cannot organize stamp, address, and envelope for mailing |
| Common errors | Added, omitted, repeated, substituted, or absent movements | Omission, misuse, and mislocation of objects |
It is tempting to describe ideational apraxia only as a sequencing problem. That is incomplete. In a study of 20 people with left-hemisphere lesions and ideational apraxia, omissions, misuse, and mislocation were common, while sequence errors were rare. Tests of single-object and multiple-object use were strongly related to each other (r = 0.85), but neither was significantly related to an ideomotor imitation test. Tool use and gesture imitation can therefore reveal different parts of the problem.
The other apraxia types can change the rehabilitation focus
Liepmann’s classic classification includes ideomotor, ideational, and limb-kinetic apraxia. The categories help clinicians describe the kind of error they see, but a person may have more than one difficulty and may also have aphasia or other stroke effects.
Limb-kinetic apraxia affects precise hand control
Limb-kinetic apraxia is the loss of precise, independent, coordinated finger and hand movements without a gross motor or sensory deficit explaining it. Buttoning clothing can be difficult. Coin rotation—turning a 20-cent coin between the thumb, index finger, and middle finger—has been proposed as a motor-dexterity test item. This form is linked to lesions in premotor and primary motor cortex.
Some difficulties are tied to a specific task or body area
Task-specific forms described in apraxia include dressing apraxia, sitting apraxia, lid-opening apraxia, and gait apraxia, although the latter two are increasingly considered separate disorders. Buccofacial apraxia, a difficulty with voluntary mouth and tongue movements, can exist alongside limb apraxia. An assessment needs to identify the real-life action that is failing rather than assume every awkward movement has the same cause.
Assessment tests look at gestures, tools, and daily activities
Apraxia should be assessed by a doctor or trained clinician, not diagnosed from a single awkward moment at home. The evaluation can include transitive gestures involving tools and intransitive communicative gestures. Pantomime requests may include “Show me how you brush your teeth” or “Wave goodbye.” These tasks can reveal whether the difficulty is most visible when an action is requested rather than performed naturally.
- De Renzi Ideomotor Apraxia Test: a 24-item scale of movement imitation for people with left- or right-sided brain damage.
- Test of Upper Limb Apraxia (TULIA): 48 imitation and pantomime items, each rated from 0 to 5, for a total possible score of 0 to 240.
- Apraxia Screen of TULIA (AST): a 12-item short version for bedside use with stroke patients.
- Florida Apraxia Battery: includes gesture-to-command, imitation, and ideational-apraxia subtests.
Tool use is assessed on two levels. A single-object task might use a hammer, screwdriver, comb, or toothbrush. A multiple-object task might involve mailing a letter or making coffee. The Test of Oral and Limb Apraxia assesses limb and orobuccal apraxia, but it does not assess performance when a person sees or uses real tools. No one score tells the whole story; the pattern across imitation, pantomime, object use, and daily activity is informative.
Occupational therapy turns assessment into daily activity practice
Occupational therapy is the central rehabilitation discipline for apraxia after stroke. Its focus is practical: daily activities and compensatory strategies. A standardized observation of activities of daily living may ask a person to wash the face and upper body, put on a shirt or blouse, prepare and eat a sandwich, and make a cup of hot chocolate. For each activity, clinicians can consider independence, initiation, execution, and control.
Strategy training teaches compensatory approaches for these activities. In a pre-post study of 33 people with left-hemisphere stroke, 12 weeks of strategy training produced large effect sizes for daily-activity measures (0.92 to 1.06), compared with smaller effects for apraxia itself (0.34) and motor function (0.19). Seventy-one percent improved on the Barthel Index. The result highlights a realistic rehabilitation aim: a person may become more able to manage a routine even if an apraxia test changes less.
In a randomized controlled study of 113 people with left-hemisphere stroke, strategy training was integrated into usual occupational therapy for eight weeks. The intervention group had an average of 25 occupational therapy sessions, or about 15 hours, while the control group had 27 sessions, or about 19 hours. A trial report on strategy training found that after eight weeks of treatment, Barthel Index scores rose by an average of 6.5 points in the experimental group and 5.3 points in the control group.
Treatment after stroke emphasizes fewer errors and useful routines
Errorless learning is another approach. Rather than letting a person repeatedly practice an incorrect action, the therapist guides the task step by step so it is completed without errors. In Errorless Completion plus Exploration Training, the person completes the entire task correctly with whatever support is needed, then practices details of the action.
In a study of 15 people with apraxia, this method significantly improved the trained daily activities, while apraxia itself improved little. Naturalistic Action Therapy similarly combines errorless learning with everyday tasks involving object selection and use. These approaches are directed at what a person needs to do, not merely at a test performance.
Evidence should be interpreted carefully. A systematic review found low evidence for strategy training alone or combined with gesture training by occupational therapists for upper-limb apraxia after stroke. A Cochrane review found limited evidence that strategy training can improve independence in daily activities in the short term; effects at six months or later were not established. Because apraxia may recover only incompletely without treatment, compensatory strategies remain a core part of rehabilitation.
Common misunderstandings can delay the right evaluation
- “It is just weakness.” Apraxia is defined by a problem with learned voluntary action that is not explained by a primary motor deficit.
- “If the person can name the tool, tool use is normal.” A person may correctly identify and describe a hammer or screwdriver while being unable to demonstrate its use.
- “Ideational apraxia always means steps are out of order.” Omission, misuse, and mislocation may be more prominent than sequence errors.
- “A bedside screen explains every real-world difficulty.” Screens are useful, but observation of actual daily activities and tool use adds information.
New or unexplained changes in the ability to carry out familiar actions deserve medical attention, particularly after a stroke or alongside other new neurological changes. A clinician can determine whether apraxia, weakness, sensory loss, language difficulty, or another problem is contributing and can guide the appropriate rehabilitation plan.
Frequently Asked Questions
What is ideomotor apraxia?
Ideomotor apraxia is an inability to perform a gesture on command despite knowing what the task requires. A person may understand an instruction and know an object’s purpose but not produce the correct voluntary movement.
What is an example of ideomotor apraxia?
A person may know that a screwdriver turns a screw but be unable to pantomime the turning action when asked. They may also use fingers as though they were a toothbrush rather than pantomime holding the toothbrush.
What is the difference between ideomotor and ideational apraxia?
In ideomotor apraxia, task knowledge is intact but the gesture cannot be carried out correctly. In ideational apraxia, the action concept is disrupted even though object recognition and naming remain intact.
What are the types of apraxia?
Liepmann described ideomotor, ideational, and limb-kinetic apraxia. Task-specific forms, such as dressing apraxia, and buccofacial apraxia may also be considered during evaluation.
How is apraxia treated after stroke?
Occupational therapy focuses on daily activities and compensatory strategies. Strategy training and errorless learning can support practice of useful routines, although evidence for long-term effects remains uncertain.
