Section 255 of 440
Complete canonical tutorial. This reader section contains the same teaching body as PWR-072 · Visuomotor integration. Open the Power dossier.
PWR-072 · SELF GUIDED full tutorial
Adapt pointing to a small cursor rotation, then measure the after-effect when normal feedback returns
The brain can adapt movement to altered visual feedback, but the learning is structured and often task-specific. Visuomotor adaptation means learning a declared mapping between seen feedback and movement. The learner uses approved software with a mild fixed cursor rotation, records baseline endpoint error, practises accurate reaches, removes the rotation and observes the after-effect. It remains a seated computer task, not general hand–eye ability or clinical prism therapy.
1 · Permission and limits
Know exactly what you may do
2 · Get ready
Gather what you need and check the starting conditions
What you need
- A local offline cursor task configured exactly as follows: 600×600 px field; centre 300,300; eight 40 px targets on a 180 px radius at mathematical angles 0° right, 45° up-right, 90° up, 135° up-left, 180° left, 225° down-left, 270° down and 315° down-right. It hides the operating-system cursor inside the field, displays one artificial cursor rotated about the centre, accepts one click per target and logs target angle, physical endpoint, displayed endpoint and phase. Baseline uses 0° rotation; adaptation rotates displayed feedback 10° clockwise; washout restores 0°. The restore key must work before a scored trial begins.
- Folded target orders: baseline 0,180,90,270,45,225,135,315,180,0,270,90,225,45,315,135; adaptation 0,90,180,270,45,135,225,315,180,270,0,90,225,315,45,135,90,0,270,180,135,45,315,225; washout 45,225,0,180,315,135,90,270,225,45,180,0,135,315,270,90. A delayed retest uses the adaptation targets in reverse order, not the original file order.
- Large radial targets and a pointing device already comfortable for the learner.
- A fixed chair, desk and device sensitivity.
- Trial log for angular/endpoint error, misses, time and symptoms.
Before you start
- Use only a mild software remapping while seated; no prism glasses, walking, tools or real-world aiming.
- Fix device sensitivity, target size, arm support and rotation angle.
- Practise an emergency exit key and restore-normal command.
- Do not use if altered visual feedback provokes vertigo, migraine or seizures.
3 · The method
Follow these steps in order
- Lock the movement setup
Record device, sensitivity, target size, start point, support and screen distance.
Why: Motor errors depend on both software and physical setup.
Check: The configuration is reproducible.
- Record normal-mapping baseline
With rotation at 0°, complete the 16 supplied baseline targets from the centre, one click per target, prioritising first endpoint over speed.
Why: Baseline separates ordinary pointing error from remapping error.
Check: Endpoint error, misses and time are saved.
- Apply the declared rotation
Set the artificial cursor to exactly 10° clockwise, verify the displayed test vector against the software readout and load the 24 supplied adaptation targets.
Why: The mapping must be known and stable.
Check: The software reports the expected angle and restore command works.
- Aim, observe, reset
For each target, aim once, observe the endpoint, return to centre and wait for the next target.
Why: One movement per target preserves error information.
Check: No dragging, correction loop or extra click hides the initial error.
- Correct gradually
Use endpoint feedback to adjust the next reach; do not consciously rotate the device or body setup.
Why: Trial-by-trial error reduction is the learning signal.
Check: Median endpoint error falls across the provider-defined block.
- Stop the remapping block
End at the fixed trial count or first nausea, dizziness, headache or loss of control.
Why: More trials are not better when symptoms or fatigue alter movement.
Check: The stop reason and trial count are recorded.
- Remove rotation and test after-effect
Press restore, confirm 0° and complete the 16 supplied washout targets with endpoint feedback withheld until each click; preserve any early error opposite the trained rotation.
Why: An after-effect helps distinguish adaptation from memorising target locations.
Check: Normal mapping is confirmed and early washout error is preserved.
- Wash out and retest later
Continue only until ordinary pointing returns, then use novel target order after a delay.
Why: The learner should leave with normal control; novel order tests retention.
Check: End performance is near baseline and the delayed order is unfamiliar.
4 · Worked example
See the whole method used once
Scenario
Tess uses a mouse task with eight large radial targets and a fixed 10° cursor rotation.
Walkthrough
- Tess records mouse sensitivity, arm support and unrotated baseline errors.
- She activates the 10° mapping and verifies the escape/restore control.
- Across 24 random reaches she makes one initial movement per target and error falls.
- She restores normal mapping; the first reaches show a small opposite after-effect that washes out.
- Two days later she uses a novel target order at the same mild rotation.
Result
Tess shows adaptation and washout in this cursor system. The result does not establish sports, driving, tool or rehabilitation transfer.
5 · Right and wrong
Compare correct or safer execution with the common wrong version
| Moment | Right / safer | Wrong / riskier | Why it matters |
|---|---|---|---|
| Context | Use a seated cursor task with a mild declared mapping. | Wear prisms or walk while vision is altered. | Real movement under remapping adds fall and collision risk. |
| Baseline | Save normal-mapping endpoint error first. | Start rotated and call later improvement ability. | Without baseline, ordinary pointing error is unknown. |
| Reach | Record the first endpoint. | Drag and correct until the cursor lands. | Online correction hides adaptation error. |
| After-effect | Restore normal mapping and preserve early error. | Skip washout and leave the device altered. | After-effect is informative and normal control must be restored. |
| Claim | Report the exact angle, device and target set. | Call it general hand–eye coordination. | Adaptation is structured and task-specific. |
6 · Common mistakes
Spot the error and apply the correction
| Mistake | Fix |
|---|---|
| Wear prisms or walk while vision is altered. | Use a seated cursor task with a mild declared mapping. |
| Start rotated and call later improvement ability. | Save normal-mapping endpoint error first. |
| Drag and correct until the cursor lands. | Record the first endpoint. |
| Skip washout and leave the device altered. | Restore normal mapping and preserve early error. |
| Call it general hand–eye coordination. | Report the exact angle, device and target set. |
7 · Practice
Turn the steps into a usable skill
First session
- Verify the cursor tool's 600 px field, centre, target radius, 10° clockwise setting, endpoint log and restore key; lock device sensitivity and arm support.
- Run the exact 16-target 0° baseline order and save the first endpoint for every target.
- Run the exact 24-target 10° adaptation order without dragging or changing posture.
- Restore 0°, confirm the readout and run the exact 16-target washout order before viewing endpoint feedback.
- Check that ordinary pointing returns near the learner's own baseline, then schedule the reversed-order 10° retest after at least 48 hours.
Repeat plan
Use one short session weekly at first. Progress by new target order or one small provider-approved angle change only after symptom-free washout and accurate baseline restoration.
Progress when
- Endpoint error falls across the rotated block.
- A measured after-effect appears and washes out safely.
- Novel-order performance improves without added misses or symptoms.
Do not progress when
- Normal mapping does not restore ordinary control promptly.
- Symptoms, tremor, pain or fatigue rise.
- The learner wants to transfer altered feedback to walking or tools.
8 · Check the result
Measure what changed
Error, after-effect and delayed transfer under a declared remapping
How: For each click, calculate target angle and displayed-endpoint angle about the centre; signed angular error is the displayed angle minus target angle wrapped to −180° to +180°, and absolute error is its magnitude. Report median signed and absolute error for baseline, the first and last eight adaptation trials and the first and last eight washout trials, plus misses, support, time and symptoms.
Good result: Error falls in the rotated block, normal control returns during washout and delayed novel-order performance improves without symptoms.
This does not prove: Separate online error reduction, after-effects, explicit strategy, retention, savings and untrained function; a lower endpoint error alone does not identify mechanism.
Self-check
- Can you demonstrate “Record normal-mapping baseline”? Endpoint error, misses and time are saved.
- Can you demonstrate “Correct gradually”? Median endpoint error falls across the provider-defined block.
- Can you demonstrate “Wash out and retest later”? End performance is near baseline and the delayed order is unfamiliar.
9 · Stop, adapt or get help
Keep the safety boundary practical
Stop and get help
- Stop and restore normal mapping for dizziness, nausea, aura, headache, disorientation or loss of motor control.
- Seek urgent care for sudden new coordination loss, weakness, speech change or severe headache.
- Use a rehabilitation professional for prism adaptation, neglect, gait or functional motor treatment.
Accessibility and adaptations
- Use trackball, switch, stylus or alternative pointing device as a declared configuration.
- Increase target size or arm support while keeping those values fixed within comparisons.
- Allow rest and slower target presentation; initial endpoint accuracy remains the measure.
10 · Evidence and limits
Why these instructions are here
- primary research
Primary research shows explicit access to structure in a defined visuomotor adaptation task, supporting mapping-specific measurement.
Structural Learning in a Visuomotor Adaptation Task Is Explicitly Accessible - primary research
Clinical prism-adaptation trials show that rehabilitation use is a separate supervised configuration with mixed outcomes.
Rehabilitation of visuospatial neglect by prism adaptation: effects of a mild treatment regime. A randomised controlled trial
Limits
- Separate online error reduction, after-effects, explicit strategy, retention, savings and untrained function; a lower endpoint error alone does not identify mechanism.
- Unsupported claim: Instant hand-eye mastery.
- Unsupported claim: Prism goggles cure neglect.
- Unsupported claim: Train while driving or using machinery.
- A cursor-remapping after-effect does not establish general hand–eye skill or authorise prism, gait, driving or tool practice.
Open the complete canonical research register
- Primary empirical supportLimiting / contraryRehabilitation of visuospatial neglect by prism adaptation: effects of a mild treatment regime. A randomised controlled trial
N. Vaes; G. Nys; C. Lafosse; L. Dereymaeker; K. Oostra; D. Hemelsoet; G. Vingerhoets · 2018 · Primary research
- Primary empirical supportLimiting / contraryStructural Learning in a Visuomotor Adaptation Task Is Explicitly Accessible
K. M. Bond; J. A. Taylor · 2017 · Primary research
- Primary empirical supportLimiting / contraryAcute neglect rehabilitation using repetitive prism adaptation: a randomized placebo-controlled trial
G. M. Nys; E. H. de Haan; A. Kunneman; P. L. de Kort; H. C. Dijkerman · 2008 · Primary research
Read the complete evidence interpretation on the Power dossier.
Tutorial delivery controls
Learn, adapt, troubleshoot and resume
Progress is saved only in this browser on this device.
Step-by-step learner mode
Each activity includes its success check, a nearby accessible alternative and an “I’m stuck” correction path. Alternatives preserve the target where possible; when they change the task, Titan labels them as related rather than equivalent.
Lock the movement setup
Record device, sensitivity, target size, start point, support and screen distance.
Motor errors depend on both software and physical setup.
The configuration is reproducible.
I’m stuck on this step
Reset: Re-read this authored instruction — “Record device, sensitivity, target size, start point, support and screen distance.” — and its success check, then attempt only this step.
Possible snag: Call it general hand–eye coordination.
Correction: Report the exact angle, device and target set.
Stop / get help: Stop and restore normal mapping for dizziness, nausea, aura, headache, disorientation or loss of motor control.
Record normal-mapping baseline
With rotation at 0°, complete the 16 supplied baseline targets from the centre, one click per target, prioritising first endpoint over speed.
Baseline separates ordinary pointing error from remapping error.
Endpoint error, misses and time are saved.
I’m stuck on this step
Reset: Re-read this authored instruction — “With rotation at 0°, complete the 16 supplied baseline targets from the centre, one click per target, prioritising first endpoint over speed.” — and its success check, then attempt only this step.
Possible snag: Wear prisms or walk while vision is altered.
Correction: Use a seated cursor task with a mild declared mapping.
Possible snag: Start rotated and call later improvement ability.
Correction: Save normal-mapping endpoint error first.
Possible snag: Drag and correct until the cursor lands.
Correction: Record the first endpoint.
Stop / get help: Stop and restore normal mapping for dizziness, nausea, aura, headache, disorientation or loss of motor control.
Apply the declared rotation
Set the artificial cursor to exactly 10° clockwise, verify the displayed test vector against the software readout and load the 24 supplied adaptation targets.
The mapping must be known and stable.
The software reports the expected angle and restore command works.
I’m stuck on this step
Reset: Re-read this authored instruction — “Set the artificial cursor to exactly 10° clockwise, verify the displayed test vector against the software readout and load the 24 supplied adaptation targets.” — and its success check, then attempt only this step.
Possible snag: The result from “Set the artificial cursor to exactly 10° clockwise, verify the displayed test vector against the software readout and load the 24 supplied adaptation targets.” does not yet meet this declared check: The software reports the expected angle and restore command works.
Correction: Return to the start of “Apply the declared rotation”, reduce complexity or pace, and repeat only the part needed to satisfy: “The software reports the expected angle and restore command works.”
Stop / get help: Stop and restore normal mapping for dizziness, nausea, aura, headache, disorientation or loss of motor control.
Aim, observe, reset
For each target, aim once, observe the endpoint, return to centre and wait for the next target.
One movement per target preserves error information.
No dragging, correction loop or extra click hides the initial error.
I’m stuck on this step
Reset: Re-read this authored instruction — “For each target, aim once, observe the endpoint, return to centre and wait for the next target.” — and its success check, then attempt only this step.
Possible snag: The result from “For each target, aim once, observe the endpoint, return to centre and wait for the next target.” does not yet meet this declared check: No dragging, correction loop or extra click hides the initial error.
Correction: Return to the start of “Aim, observe, reset”, reduce complexity or pace, and repeat only the part needed to satisfy: “No dragging, correction loop or extra click hides the initial error.”
Stop / get help: Stop and restore normal mapping for dizziness, nausea, aura, headache, disorientation or loss of motor control.
Correct gradually
Use endpoint feedback to adjust the next reach; do not consciously rotate the device or body setup.
Trial-by-trial error reduction is the learning signal.
Median endpoint error falls across the provider-defined block.
I’m stuck on this step
Reset: Re-read this authored instruction — “Use endpoint feedback to adjust the next reach; do not consciously rotate the device or body setup.” — and its success check, then attempt only this step.
Possible snag: The result from “Use endpoint feedback to adjust the next reach; do not consciously rotate the device or body setup.” does not yet meet this declared check: Median endpoint error falls across the provider-defined block.
Correction: Return to the start of “Correct gradually”, reduce complexity or pace, and repeat only the part needed to satisfy: “Median endpoint error falls across the provider-defined block.”
Stop / get help: Stop and restore normal mapping for dizziness, nausea, aura, headache, disorientation or loss of motor control.
Stop the remapping block
End at the fixed trial count or first nausea, dizziness, headache or loss of control.
More trials are not better when symptoms or fatigue alter movement.
The stop reason and trial count are recorded.
I’m stuck on this step
Reset: Re-read this authored instruction — “End at the fixed trial count or first nausea, dizziness, headache or loss of control.” — and its success check, then attempt only this step.
Possible snag: The result from “End at the fixed trial count or first nausea, dizziness, headache or loss of control.” does not yet meet this declared check: The stop reason and trial count are recorded.
Correction: Return to the start of “Stop the remapping block”, reduce complexity or pace, and repeat only the part needed to satisfy: “The stop reason and trial count are recorded.”
Stop / get help: Stop and restore normal mapping for dizziness, nausea, aura, headache, disorientation or loss of motor control.
Remove rotation and test after-effect
Press restore, confirm 0° and complete the 16 supplied washout targets with endpoint feedback withheld until each click; preserve any early error opposite the trained rotation.
An after-effect helps distinguish adaptation from memorising target locations.
Normal mapping is confirmed and early washout error is preserved.
I’m stuck on this step
Reset: Re-read this authored instruction — “Press restore, confirm 0° and complete the 16 supplied washout targets with endpoint feedback withheld until each click; preserve any early error opposite the trained rotation.” — and its success check, then attempt only this step.
Possible snag: Skip washout and leave the device altered.
Correction: Restore normal mapping and preserve early error.
Stop / get help: Stop and restore normal mapping for dizziness, nausea, aura, headache, disorientation or loss of motor control.
Wash out and retest later
Continue only until ordinary pointing returns, then use novel target order after a delay.
The learner should leave with normal control; novel order tests retention.
End performance is near baseline and the delayed order is unfamiliar.
I’m stuck on this step
Reset: Re-read this authored instruction — “Continue only until ordinary pointing returns, then use novel target order after a delay.” — and its success check, then attempt only this step.
Possible snag: The result from “Continue only until ordinary pointing returns, then use novel target order after a delay.” does not yet meet this declared check: End performance is near baseline and the delayed order is unfamiliar.
Correction: Return to the start of “Wash out and retest later”, reduce complexity or pace, and repeat only the part needed to satisfy: “End performance is near baseline and the delayed order is unfamiliar.”
Stop / get help: Stop and restore normal mapping for dizziness, nausea, aura, headache, disorientation or loss of motor control.
Correct versus incorrect execution
These accessible process diagrams are built from the tutorial’s own right/wrong teaching. They are not anatomical illustrations and do not add technique beyond the canonical tutorial.
Use a seated cursor task with a mild declared mapping.
Wear prisms or walk while vision is altered.
Save normal-mapping endpoint error first.
Start rotated and call later improvement ability.
Record the first endpoint.
Drag and correct until the cursor lands.
Restore normal mapping and preserve early error.
Skip washout and leave the device altered.
Report the exact angle, device and target set.
Call it general hand–eye coordination.
Method-structure checklist
10 of 10 structural checks present
- Ordered, Power-specific instructions — present
- Every activity has a success check — present
- Materials or supplied records are declared — present
- Measurement or assessment rule is present — present
- Tutorial-specific troubleshooting is present — present
- Stopping or escalation boundary is present — present
- Every activity has an adjacent alternative — present
- Correct-versus-incorrect comparison is present — present
- Evidence context is bound to the Power record — present
- Planning metadata is present — present
The method-readiness band and presence checklist assess tutorial presentation and are separate from evidence quality for the underlying Power. They are automated editorial aids, not human approval.
Manual editorial sign-off: Pending. This tutorial must not display a human-approved state until an identified editor signs the exact content hash.