---
title: "Intention Tremor | Intro to Brain and Behavior"
description: "Intention tremor is shaking that gets worse as you reach for a target, usually tied to cerebellar damage in Intro to Brain and Behavior."
canonical: "https://fiveable.me/introduction-brain-behavior/key-terms/intention-tremor"
type: "key-term"
subject: "Intro to Brain and Behavior"
unit: "Unit 5"
---

# Intention Tremor | Intro to Brain and Behavior

## Definition

An intention tremor is an involuntary shaking that appears during purposeful movement and gets worse as you get closer to the target. In Intro to Brain and Behavior, it points to cerebellar dysfunction.

## What It Is

An intention tremor is a tremor that shows up when you try to do something on purpose, like touching your nose, reaching for a cup, or writing your name. The shake is usually mild at the start of the movement and then becomes more obvious as your hand gets closer to the target.

That pattern matters because it tells you the problem is not just random shaking. It suggests the motor system can begin a movement, but it has trouble fine-tuning the last part of the action. In Intro to Brain and Behavior, that points straight to the cerebellum, the brain structure that helps compare what you meant to do with what your body is actually doing.

When the cerebellum is working well, it acts like a correction system. It gets input about movement plans and body position, then makes tiny adjustments so the movement stays smooth and accurate. If the cerebellum or its connections are damaged, those corrections arrive too late or are less precise, so the movement overshoots, wobbles, or shakes near the goal. That is why intention tremor often shows up with other coordination problems, such as dysmetria, where movements miss their mark.

You may see intention tremor in conditions that affect the cerebellum, including stroke, tumors, multiple sclerosis, or cerebellar degeneration. It can also look worse when someone is tired or stressed, because motor control gets less efficient. The key clue is the timing: the shaking is linked to action, especially near the end of the movement, not to rest.

This is different from a resting tremor, which happens when the muscle is not being used and is often discussed in Parkinsonian conditions. An intention tremor is about failed movement calibration, not a tremor that appears while the hand is sitting still. If you remember that detail, you can usually sort out the symptom on a quiz or case question.

## Why It Matters

Intention tremor gives you a direct window into how the cerebellum supports motor coordination. Intro to Brain and Behavior is not just asking you to memorize a symptom, it wants you to connect a movement pattern to a brain region and explain why that brain region matters.

This term also helps you read neurological symptoms more carefully. A tremor by itself is too broad, because different disorders can cause shaking in different situations. When you notice that the tremor gets worse during a goal-directed movement, you start thinking about cerebellar dysfunction rather than a basal ganglia problem or a simple weakness issue.

It also connects to broader ideas about motor planning and feedback. The cerebellum does not usually start the movement, but it shapes the timing, accuracy, and smoothness of the movement while it is happening. Intention tremor shows what happens when that feedback loop is disrupted.

In class discussions, case studies, or lab-style questions, this term often shows up as a symptom that needs interpretation. You may be asked to identify the likely brain area involved, compare two movement disorders, or explain why a patient can reach for an object but cannot do it smoothly. Intention tremor gives you a clean example of brain-behavior relationships in action.

## Connections

### Cerebellum

The cerebellum is the brain structure most closely tied to intention tremor. When it is damaged, movement corrections become inaccurate, so the tremor gets worse as you approach a target. This connection is one of the clearest ways the course links anatomy to behavior, because the symptom reflects a failure in coordination rather than strength.

### Ataxia

Ataxia is broader than intention tremor and refers to uncoordinated movement, balance problems, and gait instability. Intention tremor can appear as part of an ataxic picture when cerebellar damage affects fine motor control. If a case includes clumsy reaching plus shaky, inaccurate movements, you may be seeing multiple signs of cerebellar dysfunction at once.

### Dysmetria

Dysmetria means a person overshoots or undershoots a target during movement. It often travels with intention tremor because both come from poor cerebellar calibration. The difference is that dysmetria is about missing the mark, while intention tremor is the shaking that becomes more obvious during the attempt to hit that mark.

### [Cerebellar Degeneration](/introduction-brain-behavior/key-terms/cerebellar-degeneration)

Cerebellar degeneration is a process that gradually damages cerebellar tissue, so motor symptoms can develop slowly over time. Intention tremor can be one of the signs you notice as coordination worsens. In a case description, the slow progression helps point toward a degenerative cause rather than a sudden injury.

## On the AP Exam

A quiz question may give you a short case, like someone who reaches for a pen and starts shaking more as their hand nears the pen. Your job is to identify that pattern as intention tremor and connect it to cerebellar dysfunction. If the question includes another tremor type, compare the context: intention tremor happens during action, while resting tremor appears when the body is still.

In an essay or short answer, you may need to explain how the cerebellum supports motor coordination by comparing intended movement with actual movement. If the prompt gives symptoms such as dysmetria, poor balance, or clumsy reaching, use intention tremor as evidence that the cerebellum is involved. A strong answer names the symptom, the likely brain area, and the movement pattern that reveals it.

## intention tremor vs Resting tremor

Resting tremor shows up when the muscles are relaxed and not trying to complete a task, which is the pattern often associated with Parkinson's disease. Intention tremor appears during voluntary movement and gets worse near the target, which points more toward cerebellar problems. The timing of the shaking is the easiest way to tell them apart.

## Key Takeaways

- An intention tremor is shaking that gets worse during a purposeful movement, especially as the person gets close to a target.
- This symptom usually points to cerebellar dysfunction, because the cerebellum helps fine-tune and correct movement in real time.
- Intention tremor is different from a resting tremor, which happens when the body is at rest rather than during action.
- It often appears alongside other cerebellar signs like dysmetria, ataxia, or clumsy coordination.
- If you see a case where a person can start a movement but cannot make the final approach smoothly, intention tremor is a strong clue.

## FAQs

### What is intention tremor in Intro to Brain and Behavior?

It is an involuntary shake that happens during a goal-directed movement and gets stronger as the person nears the target. In this course, it is usually used as a sign of cerebellar damage or dysfunction. The movement itself is the clue, not just the fact that shaking is present.

### What part of the brain causes intention tremor?

The cerebellum is the main brain area linked to intention tremor. When cerebellar circuits are damaged, the brain has trouble correcting movement as it unfolds, so the hand becomes shakier near the end of the motion. That is why this symptom is so useful for localizing neurological problems.

### How is intention tremor different from resting tremor?

Intention tremor appears during voluntary movement and worsens near the target. Resting tremor happens when the person is not actively moving the body part, which is a pattern often associated with Parkinsonian disorders. The context of the shaking is the main difference.

### What is an example of intention tremor?

A common example is someone trying to touch their finger to their nose, but their hand starts shaking more as it gets closer. Writing, reaching for a cup, or using a spoon can show the same pattern. Those tasks require precision, so cerebellar problems show up clearly.

## Related Study Guides

- [5.4 Cerebellum and motor coordination](/introduction-brain-behavior/unit-5/cerebellum-motor-coordination/study-guide/TRyNmH3SWEClfhL9)

## About This Document

Canonical Fiveable pages are available as Markdown at the same path plus `.md`.

- [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns
- [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing
- [MCP server](https://fiveable.me/mcp): call Fiveable as tools instead of fetching pages (`https://fiveable.me/api/mcp`)
- [MCP server for AP teachers](https://fiveable.me/mcp/teachers): a teacher's classes, assignments and AP-rubric grading (`https://fiveable.me/api/mcp/teacher`)

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