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Visual Guide · Field Notes

How Polygraphs Work

The machine reads your body, not your honesty.

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Why it matters
It tracks involuntary stress, not lies
Cognitive load drives the reactions
Examiners interpret, machines only record
Knowing the method blunts the fear

What It Measures

  • Track respiration rate, depth, and rhythm
  • Measure sweat with electrodermal sensors
  • Monitor heart rate and blood pressure
  • Detect fidgeting and muscle micro-movements

The Sequence

  • Run a pre-test interview first
  • Establish baseline with neutral questions
  • Pose relevant questions tied to the case
  • Mix in control questions to compare

Reading Charts

  • Compare reactions across question types
  • Watch for electrodermal activity spikes
  • Note respiration inhibition and held breath
  • Flag heart rate and pressure jumps

What Triggers Reactions

  • Fear of real consequences spikes arousal
  • Heavy cognitive load betrays effort
  • Emotional conflict surfaces in the body
  • Memory recognition leaks recognition signals

The Vulnerabilities

  • Countermeasures distort the recorded traces
  • Medication dampens physiological response
  • Physical discomfort muddies the baseline
  • Examiner bias skews the scoring

Operator Stance

  • Control and steady your baseline
  • Minimize unnecessary reactions throughout
  • Treat every question as routine
  • Stay calm, breathe, and pace yourself

Scoring Reality

  • No single response proves deception
  • Patterns matter more than spikes
  • Algorithms assist but never decide alone
  • Comparison drives the final read
01

Baseline

Set normal with neutral questions

02

Relevant

Probe case-specific issues directly

03

Control

Validate patterns against general stress

04

Analysis

Score charts and compare segments

It measures stress, not truth. Master the body, master the test.

Field Notes