# PWR-067 — Peripheral target detection: learner worksheet Release: Revision 7T · Full Tutorial Edition Estimated time: Estimated 28 min reading and worksheet pass Difficulty: Intermediate Equipment: Basic stationery or digital tools — A 60 cm viewing setup: one 5 mm black fixation dot at eye level and two 6 cm square white sector cards centred 20 cm left and right of the dot. The target is a 2 cm black circle centred on an otherwise identical sector card; the blank card is plain white. A cardboard shutter lets a helper reveal the two sectors together for 750 ms without moving the centre dot.; Two folded 24-trial state lists with eight L, eight R and eight N (no target) states. Order A: L,R,N,R,N,L,N,L,R,L,N,R,R,L,N,N,R,L,L,R,N,R,N,L. Order B: N,R,L,L,N,R,R,L,N,N,L,R,L,R,N,R,N,L,N,R,L,L,N,R. For L or R, the helper places the target at that sector and a blank opposite; for N, both sectors are blank. Any void trial is reinserted later as the same state at a concealed position.; A helper, 750 ms timer or metronome cue, and an opaque cover over the folded list.; A trial sheet for target sector, answer, fixation loss, hit, miss and false alarm. Space: Desk / seated Automated structural checklist: 10 of 10 structural checks present Evidence quality/context: G1; Deep 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 Peripheral targets can be practised, but clutter and rarity create stubborn miss risks; this is not wider vision. The method trains a defined seated detection task. The learner fixes a central marker while a helper reveals a target or blank in a prespecified sector, answers before checking and records hits, misses and false alarms. Moving the eyes changes the task, and this does not establish safe walking or driving. A balanced sector schedule is part of the method: each side and blank state appears often enough that a preferred answer cannot masquerade as peripheral detection. Target outcome: The learner completes a randomised 24-trial peripheral-card block with fixation-valid trials and calculates sensitivity-relevant hit and false-alarm counts. ### Authority and setup conditions - Sit supported; do not perform while walking, balancing or near traffic. - Fix card distance, sector angles, target size, lighting and correction. - Practise saying “left”, “right” or “none” without looking away from centre. - Do not use this fixture to assess new field loss; new field symptoms need eye care. ### Required or supplied materials - A 60 cm viewing setup: one 5 mm black fixation dot at eye level and two 6 cm square white sector cards centred 20 cm left and right of the dot. The target is a 2 cm black circle centred on an otherwise identical sector card; the blank card is plain white. A cardboard shutter lets a helper reveal the two sectors together for 750 ms without moving the centre dot. - Two folded 24-trial state lists with eight L, eight R and eight N (no target) states. Order A: L,R,N,R,N,L,N,L,R,L,N,R,R,L,N,N,R,L,L,R,N,R,N,L. Order B: N,R,L,L,N,R,R,L,N,N,L,R,L,R,N,R,N,L,N,R,L,L,N,R. For L or R, the helper places the target at that sector and a blank opposite; for N, both sectors are blank. Any void trial is reinserted later as the same state at a concealed position. - A helper, 750 ms timer or metronome cue, and an opaque cover over the folded list. - A trial sheet for target sector, answer, fixation loss, hit, miss and false alarm. ## 1. Mark centre and sectors At 60 cm, place the fixation dot at eye level and centre the two sector cards exactly 20 cm left and right of it; mark the chair and board positions. Why: Eccentricity—the distance from central gaze—defines the task. Success check: Positions and distance are measured and recorded. Accessible alternative: A supported, seated, reduced-range or slower version of “At 60 cm, place the fixation dot at eye level and centre the two sector cards exactly 20 cm left and right of it; mark the chair and board positions.” is equivalent only when it keeps the same trained or measured target, declared configuration and success check: “Positions and distance are measured and recorded.” 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: [ ] ## 2. Learn the three answers With eyes free, view examples of left, right and blank, then return gaze to centre. Why: Clear labels prevent response confusion. Success check: The learner identifies all practice states. Accessible alternative: Complete “With eyes free, view examples of left, right and blank, then return gaze to centre.” in shorter passes, or use keyboard input, dictation or a support person, while preserving this success check: “The learner identifies all practice states.” Change sector position for field accessibility only as a clearly labelled new configuration. Alternative relationship: Target preserving when declared check is preserved Learner notes: ________________________________________________________________________________ Completed: [ ] ## 3. Lock fixation Keep the centre marker visible throughout each brief trial; do not chase the side card with the eyes. Why: An eye movement turns peripheral detection into direct viewing. Success check: The learner reports any fixation loss and the helper watches when possible. Accessible alternative: Complete “Keep the centre marker visible throughout each brief trial; do not chase the side card with the eyes.” in shorter passes, or use keyboard input, dictation or a support person, while preserving this success check: “The learner reports any fixation loss and the helper watches when possible.” Use larger response labels or switches; response speed is not the outcome. Alternative relationship: Target preserving when declared check is preserved Learner notes: ________________________________________________________________________________ Completed: [ ] ## 4. Present random target or blank The helper follows folded Order A or B and lifts the shutter for 750 ms: target left, target right or both cards blank. The next state stays concealed until the learner has answered. Why: Blank trials are needed to measure false alarms. Success check: Order is concealed and all three states occur. Accessible alternative: A supported, seated, reduced-range or slower version of “The helper follows folded Order A or B and lifts the shutter for 750 ms: target left, target right or both cards blank. The next state stays concealed until the learner has answered.” is equivalent only when it keeps the same trained or measured target, declared configuration and success check: “Order is concealed and all three states occur.” 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: [ ] ## 5. Answer before checking Say left, right or none, plus confidence, while still looking at centre. Why: Committed responses separate detection from confirmation. Success check: The answer is written before the card is shown centrally. Accessible alternative: Replace small or visual-only information with enlarged text, high-contrast display, spoken description or tactile/verbal cueing while preserving the same decision and success check. Change sector position for field accessibility only as a clearly labelled new configuration. Alternative relationship: Target preserving when declared check is preserved Learner notes: ________________________________________________________________________________ Completed: [ ] ## 6. Classify the result Mark hit, miss, correct rejection or false alarm; void any trial with lost fixation. Why: Accuracy alone hides response bias and invalid trials. Success check: Every valid trial has one classification. Accessible alternative: Complete “Mark hit, miss, correct rejection or false alarm; void any trial with lost fixation.” in shorter passes, or use keyboard input, dictation or a support person, while preserving this success check: “Every valid trial has one classification.” Use larger response labels or switches; response speed is not the outcome. Alternative relationship: Target preserving when declared check is preserved Learner notes: ________________________________________________________________________________ Completed: [ ] ## 7. Retest a novel order After rest or a later day, use a new random order with the same sectors and target prevalence. Why: Novel order prevents memorising where targets appear. Success check: Target frequency and geometry match the baseline. Accessible alternative: Replace small or visual-only information with enlarged text, high-contrast display, spoken description or tactile/verbal cueing while preserving the same decision and success check. A helper may watch fixation or operate cards while following the concealed order. Alternative relationship: Target preserving when declared check is preserved Learner notes: ________________________________________________________________________________ Completed: [ ] ## 8. Audit sector balance After the block, count how many valid left, right and blank trials were presented and how often each answer was used. If one state is underrepresented or one answer dominates, create a balanced new order before interpreting change. Why: Sector imbalance and a habitual left, right or none response can produce an attractive overall score without reliable target detection. Success check: Valid trial counts meet the declared sector balance and no response dominates without matching the actual target order. Accessible alternative: A supported, seated, reduced-range or slower version of “After the block, count how many valid left, right and blank trials were presented and how often each answer was used. If one state is underrepresented or one answer dominates, create a balanced new order before interpreting change.” is equivalent only when it keeps the same trained or measured target, declared configuration and success check: “Valid trial counts meet the declared sector balance and no response dominates without matching the actual target order.” 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: [ ] ## 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.