Revision 7T · Full Tutorial Edition · Updated 1 September 2026
PWR-109 · SELF GUIDED full tutorial
Practise one harmless line-tilt discrimination and test its narrow transfer
Perceptual learning is improvement in judging a declared sensory pattern through practice. It is usually stimulus-specific. This lesson uses high-contrast cards with a line tilted left or right by a fixed angle. The learner keeps viewing distance, lighting and usual correction constant, establishes baseline accuracy without feedback, practises short feedback blocks, tests after a delay and uses a new line length to check narrow transfer. This is not vision therapy, diagnosis or a route to normal vision.
What you will produceThe learner completes baseline, feedback practice, delayed test and one new-line-length transfer test while accuracy, errors, response time, viewing conditions and strain are recorded.
Full step-by-step individual tutorial · TLU-PWR-109
The learner completes baseline, feedback practice, delayed test and one new-line-length transfer test while accuracy, errors, response time, viewing conditions and strain are recorded.
Practise a comfortable high-contrast left/right line-tilt task using both eyes and usual correction.
Use answer-key feedback and short blocks with rest.
Stop and seek eye care for new visual symptoms rather than training through them.
Qualified help is required for
Vision rehabilitation, amblyopia, central vision loss, field loss, neurological/vestibular symptoms or monocular training.
Diagnosis, treatment, optical correction changes or claims about functional driving/reading vision.
Research-grade threshold measurement or clinical transfer assessment.
Never do this from the page alone
Patch an eye, remove prescribed glasses, use flashing/strobing stimuli or deliberately strain from this lesson.
Practise while driving, walking in hazards or using machinery.
Call improvement normal vision, restored sight or a generalized super-sense.
2 · Get ready
Gather what you need and check the starting conditions
What you need
Forty high-contrast line cards: 20 left and 20 right at the same declared tilt
A second matched set with a different line length for transfer
Answer key hidden during tests
Fixed 50 cm viewing-distance marker, stable lighting and timer
Error/response/strain sheet
Before you start
Use both eyes and the usual glasses/contact lenses unless an eye professional directs otherwise.
Fix comfortable lighting, card size, contrast, tilt and 50 cm distance.
Shuffle left/right order and keep the answer key out of view during baseline and tests.
Do not begin with new vision loss, double vision, eye pain, flashes/floaters, severe headache or dizziness.
3 · The method
Follow these steps in order
Lock the visual fixture
Record line angle/length, contrast, card distance, lighting, both-eye use and usual correction.
Why: Threshold and error depend on viewing conditions.
Check: All settings are measurable and unchanged.
Learn the response rule
For two obvious sample cards, say LEFT when the top leans left and RIGHT when it leans right; do not rotate the card.
Why: A clear response mapping prevents label confusion.
Check: Both samples are named correctly; the visible 'Learn the response rule' check is satisfied.
Measure baseline without feedback
Classify 20 shuffled cards one at a time, recording response and time; do not reveal the answer until the block ends.
Why: Baseline should not contain learning feedback.
Check: All 20 responses and errors are retained.
Practise in short feedback blocks
Complete two 10-card blocks. After each response, check the key, state correct/incorrect and view the correct orientation for one second.
Why: Immediate specific feedback links the stimulus to the right response.
Check: Every practice response receives the same feedback.
Rest the eyes
Look away at a distant comfortable target and rest for two minutes between blocks; stop for strain or visual symptoms.
Why: Short rest reduces fatigue as a source of error.
Check: Symptoms return to baseline before continuing.
Run a delayed matched test
After at least 10 minutes doing a non-visual or comfortable neutral task, classify 20 matched cards without feedback under the original setup.
Why: Delay separates retained change from immediate answer memory.
Check: Conditions and scoring match baseline; the visible 'Run a delayed matched test' check is satisfied.
Test narrow transfer
Use the new line-length set with the same tilt, contrast, distance and response rule. Report it separately.
Why: A surface change tests whether learning extends beyond the exact cards.
Check: No other feature changes; the visible 'Test narrow transfer' check is satisfied.
Interpret narrowly
Compare accuracy and median response time, check left/right bias and strain. Call improvement task-specific unless the new set also improves.
Why: A threshold change does not mean whole-sense restoration.
Check: The conclusion names trained and untrained conditions separately.
4 · Worked example
See the whole method used once
Scenario
At 50 cm, a learner judges 20 cards with 5-degree left/right tilt, practises two feedback blocks, waits 10 minutes and tests both the original-length and shorter-line sets.
Walkthrough
Baseline is 15/20 correct, with four of five errors on right-tilting cards.
Practice blocks are 8/10 and 9/10 with immediate answer-key feedback.
After the delay, the matched test is 18/20 with similar response time and no strain.
The shorter-line transfer set is 15/20, the same as baseline-level accuracy.
The learner reports retained improvement for the trained line length but no demonstrated transfer to shorter lines.
Result
Accuracy improved on the trained fixture but not the changed line length. This does not establish improved everyday vision, diagnosis, restored normal sight or a clinical benefit.
5 · Right and wrong
Compare correct or safer execution with the common wrong version
Right and wrong comparison
Moment
Right / safer
Wrong / riskier
Why it matters
Viewing setup
Keep distance, light, correction and card angle fixed.
Move closer on difficult cards; it breaks the 'Lock the visual fixture' execution rule.
The stimulus becomes easier and incomparable.
Feedback: Perceptual learning checkpoint
Use the answer key after each practice response.
Guess repeatedly without correction; it breaks the 'Learn the response rule' execution rule.
The target mapping may not be learned.
Test: Perceptual learning checkpoint
Hide feedback during baseline and delayed test.
Peek at answers while scoring retention.
Test performance becomes practice. That changes accuracy, error bias and response time for one declared visual discrimination, plus a separate functional outcome when clinically justified. It is no longer the same test.
Transfer: Perceptual learning checkpoint
Change only line length. It is correct when every practice response receives the same feedback.
Change tilt, contrast, distance and line length together.
The source of success/failure is unknown.
Claim: Perceptual learning checkpoint
Call the gain trained-task discrimination. It is correct when symptoms return to baseline before continuing.
Call it normal vision or better driving.
Functional and clinical transfer were not measured.
6 · Common mistakes
Spot the error and apply the correction
Common mistakes and corrections
Mistake
Fix
Viewing distance drifts during 'Lock the visual fixture' in perceptual learning.
Use a table marker and keep the head at the declared position.
Cards are rotated while answering.
Place a fixed top mark and reject rotated trials.
Feedback leaks into baseline during 'Measure baseline without feedback' in perceptual learning.
Hide the key until the full baseline block ends.
Only overall accuracy is checked.
Report left/right errors separately to reveal response bias.
The learner trains through eye strain.
Stop, rest and seek eye care for new/persistent symptoms.
7 · Practice
Turn the steps into a usable skill
First session
Set and record the comfortable visual fixture.
Complete two obvious samples and a 20-card no-feedback baseline.
Practise two 10-card feedback blocks with two-minute rests.
After a 10-minute delay, complete the matched no-feedback test.
Complete one new-line-length transfer set and write the narrow conclusion.
Repeat plan
Use one short session on three non-consecutive days, each with two 10-card feedback blocks and rests. On day four, run only a no-feedback retention test and one single-feature transfer set. Stop after 80 total card judgements per session or earlier for strain.
Progress when
Matched-test accuracy improves on two days without slower responses or strain.
Left/right response bias decreases rather than overall accuracy hiding it.
One-feature transfer is demonstrated directly before making any transfer statement.
Do not progress when
Eye strain, headache, dizziness, double vision or new visual symptoms appears.
Improvement requires moving closer, brighter light or changed correction.
The exercise is proposed as clinical vision treatment or safety certification.
8 · Check the result
Measure what changed
Accuracy, error bias and response time for one declared visual discrimination, plus a separate functional outcome when clinically justified
How: Keep stimulus and viewing conditions fixed; compare no-feedback baseline and delayed tests and report single-feature transfer separately.
Good result: Matched accuracy improves beyond ordinary variation on two days without worse time or symptoms, and transfer is claimed only if directly shown.
This does not prove: It does not prove normal vision, restored sight, diagnosis, driving safety or generalized perceptual enhancement.
Self-check
Are tilt, length, distance, light and correction fixed?
Was baseline/test completed without feedback?
Did practice use immediate correct-answer feedback?
Are left and right errors reported separately?
Can you state whether the new line length transferred?
9 · Stop, adapt or get help
Keep the safety boundary practical
Stop and get help
Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.
Stop for persistent double vision, dizziness, headache, nausea or eye strain that does not settle with rest.
Use qualified eye/rehabilitation care for known visual impairment; do not adapt this card drill into treatment.
Accessibility and adaptations
Increase card size or contrast to a comfortable accessible baseline and treat it as a separate configuration.
Use spoken response recording or a large left/right switch so motor writing does not dominate.
Provide glare control and scheduled rest while keeping the chosen viewing setup constant.
10 · Evidence and limits
Why these instructions are here
primary research
A very small diagnosis-specific study reported lasting improvement after perceptual learning in central vision loss, so clinical generalisation is limited.
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.
01
Lock the visual fixture
Record line angle/length, contrast, card distance, lighting, both-eye use and usual correction.
Why this step exists
Threshold and error depend on viewing conditions.
Success check
All settings are measurable and unchanged.
I’m stuck on this step
Reset: Re-read this authored instruction — “Record line angle/length, contrast, card distance, lighting, both-eye use and usual correction.” — and its success check, then attempt only this step.
Possible snag: Viewing distance drifts during 'Lock the visual fixture' in perceptual learning.
Correction: Use a table marker and keep the head at the declared position.
Stop / get help: Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.
02
Learn the response rule
For two obvious sample cards, say LEFT when the top leans left and RIGHT when it leans right; do not rotate the card.
Why this step exists
A clear response mapping prevents label confusion.
Success check
Both samples are named correctly; the visible 'Learn the response rule' check is satisfied.
I’m stuck on this step
Reset: Re-read this authored instruction — “For two obvious sample cards, say LEFT when the top leans left and RIGHT when it leans right; do not rotate the card.” — and its success check, then attempt only this step.
Possible snag: Cards are rotated while answering.
Correction: Place a fixed top mark and reject rotated trials.
Stop / get help: Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.
03
Measure baseline without feedback
Classify 20 shuffled cards one at a time, recording response and time; do not reveal the answer until the block ends.
Why this step exists
Baseline should not contain learning feedback.
Success check
All 20 responses and errors are retained.
I’m stuck on this step
Reset: Re-read this authored instruction — “Classify 20 shuffled cards one at a time, recording response and time; do not reveal the answer until the block ends.” — and its success check, then attempt only this step.
Possible snag: Feedback leaks into baseline during 'Measure baseline without feedback' in perceptual learning.
Correction: Hide the key until the full baseline block ends.
Stop / get help: Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.
04
Practise in short feedback blocks
Complete two 10-card blocks. After each response, check the key, state correct/incorrect and view the correct orientation for one second.
Why this step exists
Immediate specific feedback links the stimulus to the right response.
Success check
Every practice response receives the same feedback.
I’m stuck on this step
Reset: Re-read this authored instruction — “Complete two 10-card blocks. After each response, check the key, state correct/incorrect and view the correct orientation for one second.” — and its success check, then attempt only this step.
Possible snag: The result from “Complete two 10-card blocks. After each response, check the key, state correct/incorrect and view the correct orientation for one second.” does not yet meet this declared check: Every practice response receives the same feedback.
Correction: Return to the start of “Practise in short feedback blocks”, reduce complexity or pace, and repeat only the part needed to satisfy: “Every practice response receives the same feedback.”
Stop / get help: Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.
05
Rest the eyes
Look away at a distant comfortable target and rest for two minutes between blocks; stop for strain or visual symptoms.
Why this step exists
Short rest reduces fatigue as a source of error.
Success check
Symptoms return to baseline before continuing.
I’m stuck on this step
Reset: Re-read this authored instruction — “Look away at a distant comfortable target and rest for two minutes between blocks; stop for strain or visual symptoms.” — and its success check, then attempt only this step.
Possible snag: The learner trains through eye strain.
Correction: Stop, rest and seek eye care for new/persistent symptoms.
Stop / get help: Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.
06
Run a delayed matched test
After at least 10 minutes doing a non-visual or comfortable neutral task, classify 20 matched cards without feedback under the original setup.
Why this step exists
Delay separates retained change from immediate answer memory.
Success check
Conditions and scoring match baseline; the visible 'Run a delayed matched test' check is satisfied.
I’m stuck on this step
Reset: Re-read this authored instruction — “After at least 10 minutes doing a non-visual or comfortable neutral task, classify 20 matched cards without feedback under the original setup.” — and its success check, then attempt only this step.
Possible snag: The result from “After at least 10 minutes doing a non-visual or comfortable neutral task, classify 20 matched cards without feedback under the original setup.” does not yet meet this declared check: Conditions and scoring match baseline; the visible 'Run a delayed matched test' check is satisfied.
Correction: Return to the start of “Run a delayed matched test”, reduce complexity or pace, and repeat only the part needed to satisfy: “Conditions and scoring match baseline; the visible 'Run a delayed matched test' check is satisfied.”
Stop / get help: Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.
07
Test narrow transfer
Use the new line-length set with the same tilt, contrast, distance and response rule. Report it separately.
Why this step exists
A surface change tests whether learning extends beyond the exact cards.
Success check
No other feature changes; the visible 'Test narrow transfer' check is satisfied.
I’m stuck on this step
Reset: Re-read this authored instruction — “Use the new line-length set with the same tilt, contrast, distance and response rule. Report it separately.” — and its success check, then attempt only this step.
Possible snag: The result from “Use the new line-length set with the same tilt, contrast, distance and response rule. Report it separately.” does not yet meet this declared check: No other feature changes; the visible 'Test narrow transfer' check is satisfied.
Correction: Return to the start of “Test narrow transfer”, reduce complexity or pace, and repeat only the part needed to satisfy: “No other feature changes; the visible 'Test narrow transfer' check is satisfied.”
Stop / get help: Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.
08
Interpret narrowly
Compare accuracy and median response time, check left/right bias and strain. Call improvement task-specific unless the new set also improves.
Why this step exists
A threshold change does not mean whole-sense restoration.
Success check
The conclusion names trained and untrained conditions separately.
I’m stuck on this step
Reset: Re-read this authored instruction — “Compare accuracy and median response time, check left/right bias and strain. Call improvement task-specific unless the new set also improves.” — and its success check, then attempt only this step.
Possible snag: Only overall accuracy is checked.
Correction: Report left/right errors separately to reveal response bias.
Stop / get help: Stop and seek urgent eye care for sudden vision loss, a curtain/shadow, new flashes/floaters with vision change, severe eye pain or acute neurological symptoms.
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.
Viewing setup — The stimulus becomes easier and incomparable.
Correct / safer
Keep distance, light, correction and card angle fixed.
Wrong / riskier
Move closer on difficult cards; it breaks the 'Lock the visual fixture' execution rule.
Feedback: Perceptual learning checkpoint — The target mapping may not be learned.
Correct / safer
Use the answer key after each practice response.
Wrong / riskier
Guess repeatedly without correction; it breaks the 'Learn the response rule' execution rule.
Test: Perceptual learning checkpoint — Test performance becomes practice. That changes accuracy, error bias and response time for one declared visual discrimination, plus a separate functional outcome when clinically justified. It is no longer the same test.
Correct / safer
Hide feedback during baseline and delayed test.
Wrong / riskier
Peek at answers while scoring retention.
Transfer: Perceptual learning checkpoint — The source of success/failure is unknown.
Correct / safer
Change only line length. It is correct when every practice response receives the same feedback.
Wrong / riskier
Change tilt, contrast, distance and line length together.
Claim: Perceptual learning checkpoint — Functional and clinical transfer were not measured.
Correct / safer
Call the gain trained-task discrimination. It is correct when symptoms return to baseline before continuing.
Wrong / riskier
Call it normal vision or better driving.
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.