# PWR-219 — Haptic data perception: learner worksheet Release: Revision 7T · Full Tutorial Edition Estimated time: Estimated 26 min reading and worksheet pass Difficulty: Intermediate Equipment: Common household or practice equipment — Four supplied printed pulse strips with this locked codebook: Red is one long pulse; Blue is two short pulses; Green is short then long; Yellow is long then short. A long pulse lasts 600 milliseconds, a short pulse 200 milliseconds and the gap is 400 milliseconds.; Optional user-controlled vibration device at a comfortable preset; visual and text alternatives remain available.; Twenty supplied test cards in concealed order R, B, G, Y, B, R, Y, G, R, G, B, Y, G, Y, R, B, Y, G, B, R; a separate answer strip spelling out those twenty labels, a replay counter, confusion matrix and comfort scale. Cards 1 to 12 form the mixed block and cards 13 to 20 form the delayed block. Space: Room-scale practice space Automated structural checklist: 10 of 10 structural checks present Evidence quality/context: G1; Detailed research depth Automated method-quality band: Comprehensive Method-rating basis: Structure coverage, instruction/check specificity, alternative distinctness, source troubleshooting, comparison depth and whether purpose/check fields are authored rather than derived. Editorial review: Pending manual editorial sign off ## Before you begin - [ ] I read the tutorial authority and stop conditions. - [ ] I have the required equipment/space or a declared accessible alternative. ## Canonical source context This lesson teaches a small, optional tactile-code method. You will learn two user-started patterns, add two only if comfortable, build a confusion matrix, retest after delay and compare with a visual or text channel. The result is code- and device-specific. Target outcome: The learner identifies four benign user-started patterns from a locked codebook with at least 80% accuracy on a novel sequence and names the confused pairs, replay use and sensory burden. ### Authority and setup conditions - Choose a comfortable body site or use the visual-only version; inspect skin and remove tight clothing or jewellery near an optional device. - Assign four neutral meanings and mark the device, software, waveform, body site and replay limit. - Set the stop rule: any pain, numbness, persistent tingling, skin change, nausea or overload ends tactile practice. ### Required or supplied materials - Four supplied printed pulse strips with this locked codebook: Red is one long pulse; Blue is two short pulses; Green is short then long; Yellow is long then short. A long pulse lasts 600 milliseconds, a short pulse 200 milliseconds and the gap is 400 milliseconds. - Optional user-controlled vibration device at a comfortable preset; visual and text alternatives remain available. - Twenty supplied test cards in concealed order R, B, G, Y, B, R, Y, G, R, G, B, Y, G, Y, R, B, Y, G, B, R; a separate answer strip spelling out those twenty labels, a replay counter, confusion matrix and comfort scale. Cards 1 to 12 form the mixed block and cards 13 to 20 form the delayed block. ## 1. Define the four-code boundary Write the exact pattern, neutral meaning, device and body site for each code; state that the set is not an alert system. Why: The same pulse can mean something different in another codebook. Success check: Every label has one visible pattern and no safety-critical meaning. Accessible alternative: Complete the same research action — “Write the exact pattern, neutral meaning, device and body site for each code; state that the set is not an alert system.” — using speech-to-text, text-to-speech, enlarged text, keyboard-only navigation, shorter work blocks or a support person. Preserve this declared check: “Every label has one visible pattern and no safety-critical meaning.” Do not convert the research task into capability practice. Alternative relationship: Target preserving when declared check is preserved Learner notes: ________________________________________________________________________________ Completed: [ ] ## 2. Learn the first pair Start each pattern yourself, view its pulse strip and say or select its label; alternate the two patterns six times. Why: Two-item discrimination reveals basic fit without overload. Success check: The learner identifies both labels twice in a row without extra replay. Accessible alternative: Complete “Start each pattern yourself, view its pulse strip and say or select its label; alternate the two patterns six times.” in shorter passes, or use keyboard input, dictation or a support person, while preserving this success check: “The learner identifies both labels twice in a row without extra replay.” Choose another body site only as a new configuration and never remove an established sensory aid to force tactile use. Alternative relationship: Target preserving when declared check is preserved Learner notes: ________________________________________________________________________________ Completed: [ ] ## 3. Test the pair blind to order Shuffle six cards or have a helper choose them; lock each answer and confidence before revealing the label. Why: Random presentation prevents memorising a fixed card position instead of the pulse pattern. Success check: The sheet records accuracy, replays and any A-for-B confusion. Accessible alternative: Complete “Shuffle six cards or have a helper choose them; lock each answer and confidence before revealing the label.” in shorter passes, or use keyboard input, dictation or a support person, while preserving this success check: “The sheet records accuracy, replays and any A-for-B confusion.” Use printed pulse strips, text labels or optional audio descriptions as equal alternatives to vibration. Alternative relationship: Target preserving when declared check is preserved Learner notes: ________________________________________________________________________________ Completed: [ ] ## 4. Add the second pair Only if comfortable, teach the remaining two patterns as a separate pair before mixing all four. Why: Pairwise learning makes a confused waveform easier to repair. Success check: Each new label is identified twice consecutively in its pair. Accessible alternative: Complete “Only if comfortable, teach the remaining two patterns as a separate pair before mixing all four.” in shorter passes, or use keyboard input, dictation or a support person, while preserving this success check: “Each new label is identified twice consecutively in its pair.” Allow a two-code vocabulary, larger gaps and longer response time; accuracy is compared only within the declared format. Alternative relationship: Target preserving when declared check is preserved Learner notes: ________________________________________________________________________________ Completed: [ ] ## 5. Build the confusion matrix Run twelve mixed trials and tally each response against the actual code in a four-by-four table. Why: Total accuracy can hide one repeatedly confused pair. Success check: The largest off-diagonal cell names the pair that needs repair. Accessible alternative: A supported, seated, reduced-range or slower version of “Run twelve mixed trials and tally each response against the actual code in a four-by-four table.” is equivalent only when it keeps the same trained or measured target, declared configuration and success check: “The largest off-diagonal cell names the pair that needs repair.” If any of those change, record it as a related alternative rather than an equivalent repetition. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 6. Repair one waveform distinction Change one harmless feature of the confused pair, such as pulse count or gap, keep intensity fixed and repeat four matched trials. Why: One controlled change shows whether the code, not effort, caused the error. Success check: The repaired pair improves or is retired with the before/after counts visible. Accessible alternative: A supported, seated, reduced-range or slower version of “Change one harmless feature of the confused pair, such as pulse count or gap, keep intensity fixed and repeat four matched trials.” is equivalent only when it keeps the same trained or measured target, declared configuration and success check: “The repaired pair improves or is retired with the before/after counts visible.” If any of those change, record it as a related alternative rather than an equivalent repetition. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 7. Retest later and by another channel After at least 48 hours, run a new eight-item sequence, then match the same labels using the visual strips or text legend. Why: Retention and channel dependence are separate questions. Success check: Delayed tactile and alternative-channel scores are reported separately. Accessible alternative: A supported, seated, reduced-range or slower version of “After at least 48 hours, run a new eight-item sequence, then match the same labels using the visual strips or text legend.” is equivalent only when it keeps the same trained or measured target, declared configuration and success check: “Delayed tactile and alternative-channel scores are reported separately.” If any of those change, record it as a related alternative rather than an equivalent repetition. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 8. Decide keep, shrink or retire Keep four codes only if accuracy, burden and value meet the predeclared rule; otherwise return to two or use the alternative. Why: A smaller accessible vocabulary may be the better capability. Success check: The decision names accuracy, confusions, replays, comfort and intended low-stakes use. Accessible alternative: Complete “Keep four codes only if accuracy, burden and value meet the predeclared rule; otherwise return to two or use the alternative.” in shorter passes, or use keyboard input, dictation or a support person, while preserving this success check: “The decision names accuracy, confusions, replays, comfort and intended low-stakes use.” Choose another body site only as a new configuration and never remove an established sensory aid to force tactile use. Alternative relationship: Target preserving when declared check is preserved Learner notes: ________________________________________________________________________________ Completed: [ ] ## Reflection What changed? ________________________________________________________________________________ What remains difficult? ________________________________________________________________________________ What will I repeat, adapt, ask for help with, or stop? ________________________________________________________________________________ --- Completion of this worksheet demonstrates tutorial participation only. It does not establish capability, qualification, safety clearance, diagnosis, treatment or independent validation.