biology

Hemimotor neglect

Hemimotor neglect is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Hemimotor neglect rather than just read about it. In short: Hemimotor neglect or simply motor neglect is a neuropsychological condition that occurs after damage to one hemisphere of the brain, characterized by a failure of spontaneous use of upper and lower limbs on one side of body. It occurs in the absence of paralysis, pyramidal syndromes, extrapyramidal symptoms, strength and primary sensory deficit.

Key takeaways

Hemimotor neglect belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Hemimotor neglect to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Hemimotor neglect from memory before moving on to harder problems.

Reference excerpt

Hemimotor neglect or simply motor neglect is a neuropsychological condition that occurs after damage to one hemisphere of the brain, characterized by a failure of spontaneous use of upper and lower limbs on one side of body. It occurs in the absence of paralysis, pyramidal syndromes, extrapyramidal symptoms, strength and primary sensory deficit.

Presentation Motor neglect can occur in isolation from, or in association with hemispatial neglect, making the pathological state more complicated in at least 30% of patients with brain damage. Motor neglect has been described in different terms: disorders and intentional neglect; motor hemi neglect; thalamic, nonsensory neglect; and callosal neglect. Laplane and Degos coined the term motor neglect, giving this definition:"Absent or low use of spontaneous contralesional limb (lower and/or higher), despite preserved motor skills...not explained by weakness or lack of sensitivity, it improves with the verbal suggestion".

Clinical features Motor neglect concerns all proximal and distal movements, involving both the upper and lower limb in automatic gestures. Taxonomy of motor neglect symptoms is diverse: poor use of the affected limb, difficulty in bimanual activities (such as opening a bottle), spontaneous gestures reduced especially while speaking and, lack of "swing" of the arm while walking. The gait is unbalanced, and the lower limb is often dragged with the consequent risk of falls. Movements of the neglected limb, when executed, are initiated with delay hypokinesia, reduced in their amplitude, and accompanied by bradykinesia One of the most distinctive features of motor neglect is the verbal prompt. Specifically, patients that are encouraged to use the limb with motor neglect have relatively normal movement, but do not perform the same movement spontaneously. Two forms of motor deficits are associated with, but different from, motor neglect: directional hypokinesia and, motor neglect component Directional hypokinesia refers to a deficit of startup of movements of ipsilesional limbs in contralesional space. Patients are slowed down when they have to perform an action with the non-neglected limb in space account side, despite preservation of control and motor coordination. Motor neglect component is similar to motor neglect but, unlike the latter, doesn't improve through direct verbal command, only through vestibular caloric stimulation.

See also Hemispatial neglect Arm swing in human locomotion Brain damage Neuropsychology

References

Worked examples

Example 1 — a first encounter with Hemimotor neglect

Start with the simplest possible case. Write down what Hemimotor neglect claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Hemimotor neglect before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Hemimotor neglect ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Hemimotor neglect

In research: Hemimotor neglect appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Hemimotor neglect in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Hemimotor neglect is common in secondary-school and first-year university syllabi. It links to neighbouring topics Gait abnormalities, Neurological disorders, so understanding it makes those chapters shorter.
In everyday life: Look for Hemimotor neglect outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Hemimotor neglect in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hemimotor neglect means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Hemimotor neglect out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hemimotor neglect in simple terms?

Why does Hemimotor neglect matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Hemimotor neglect?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Hemimotor neglect.