PWR-067 · Visual Perception & Search

Peripheral target detection

Peripheral targets can be practised, but clutter and rarity create stubborn miss risks; this is not wider vision.

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Revision 7T · Full Tutorial Edition · Release manifest · Methodology · Corrections

One source of teaching truth

Canonical Power learning unit · TLU-PWR-067

The learner completes a randomised 24-trial peripheral-card block with fixation-valid trials and calculates sensitivity-relevant hit and false-alarm counts.

Canonical Power page
PWR-067 · Peripheral target detection
Full tutorial
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Practical authority
The tutorial teaches a low-risk method that may be practised inside its stated limits.
Current treatment
Full low-stakes tutorial
Research depth
deep · 6 bound sources
Risk framing
low to moderate; clinical when visual disorder or prism
Capability self-practice
Permitted inside the tutorial's stated low-risk limits
Pathway membership
G-CUR-006

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Explanation is not permission.

This dossier explains the evidence and its limits. It is not a diagnosis, personal recommendation, assessment, clearance, performance promise or training programme. Actionable teaching appears only when the canonical Power record explicitly authorises it.

Complete bounded explanation

What this power means.

Capability to develop or express peripheral target detection in a declared context without inheriting broader claims.

What the current evidence supports

Peripheral detection can improve on selected crowding tasks, while rare, unexpected targets remain a major failure mode.

How to observe or measure it without overclaiming

Predeclare eccentricity, target, clutter, prevalence, sensitivity and false alarms; a reaction-time gain alone may reflect criterion shift rather than better perception.

Myth

Eyes in the back of your head

Metric

Sensitivity and false alarms for prespecified peripheral targets by eccentricity and prevalence

Boundary

No task demonstrates a larger anatomical visual field or zero-miss hazard detection.

Negative and limiting findings

  • Rare targets are often missed even by practised observers.
  • Crowding-task improvement does not establish broader peripheral awareness.

Claims this evidence cannot support

  • Expand your visual field
  • Develop 360-degree vision
  • Never miss a hazard
  • Cure neglect with a home drill

Individual tutorial · FULL SELF GUIDED TUTORIAL

How to learn this Power now.

The learner completes a randomised 24-trial peripheral-card block with fixation-valid trials and calculates sensitivity-relevant hit and false-alarm counts.

  1. Get readySit supported; do not perform while walking, balancing or near traffic.
  2. Learn the method8 concrete steps teach the permitted method from start to finish.
  3. See right and wrong6 comparisons show correct or safer execution beside common wrong or riskier choices.
  4. PractiseUse one 24-trial block once or twice weekly with novel orders and the same prevalence. Progress only when hits rise without more false alarms and fixation remains valid.
  5. Check progressFor valid trials, hit rate = correct L or R locations divided by all target presentations; blank false-alarm rate = L or R answers on N trials divided by valid N trials. Also report left and right accuracy separately, side confusions, correct rejections, voids, replacements, 20 cm offsets, 60 cm distance and 750 ms reveal time.

Authority boundary: Titan teaches a concrete low-stakes method step by step while keeping evidence and transfer claims bounded. The method is Power-specific; its actionability follows this treatment.

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Related Powers: PWR-065 · PWR-066 · PWR-068 · PWR-069

Direct evidence register

Sources that support—and limit—the claim.

Citation roles are explicit. A source may support existence or trainability while simultaneously limiting transfer, certainty, generalisation or safety.

  1. Primary empirical supportLimiting / contrary
    Cognitive psychology: rare items often missed in visual searches

    J. M. Wolfe; T. S. Horowitz; N. M. Kenner · 2005 · Primary research

  2. Limiting / contrary
    Rehabilitation 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

  3. Primary empirical supportLimiting / contrary
    Two-stage perceptual learning to break visual crowding

    Z. Zhu; Z. Fan; F. Fang · 2016 · Primary research

  4. Limiting / contrary
    Dissociating electrophysiological correlates of contextual and perceptual learning in a visual search task

    C. C. Le Dantec; A. R. Seitz · 2020 · Primary research

  5. Limiting / contraryOfficial boundary context
    Aeronautical Information Manual, Chapter 8: Medical Facts for Pilots

    Federal Aviation Administration · 2026 · Official authority

  6. Limiting / contrary
    Acute 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

Current teaching and evidence boundary

The next gate remains visible.

External confirmation is required before higher-authority use because: a clinical, high-risk or regulated configuration.

A Power-specific tutorial is available at /tutorials/pwr-067/. It contains a plain-English method, 8 ordered steps, a worked example, right-versus-wrong comparisons, specific mistakes and corrections, practice, measurement, accessibility, stopping rules and evidence. Its self guided mode remains controlling.