Polygraph Glossary Scoring

reaction tracing

Definition

A reaction tracing is the section of a physiological recording where Arousal is apparent — the visible response to a stimulus, as opposed to the baseline or relief sections of the tracing.

What Is a Reaction Tracing?

A reaction tracing is the section of a physiological recording where Arousal is apparent — the visible response to a stimulus, as opposed to the baseline or relief sections of the tracing.

Historical and Modern Context

The evolution of polygraph instrumentation — from early mechanical devices to modern digital systems — reflects the broader advancement of the field from subjective interpretation to validated, structured test data analysis. Modern instruments from manufacturers such as Lafayette, Limestone, and Stoelting incorporate multiple measurement channels, digital recording, and computerised scoring capabilities.

Professional Context

This concept forms part of the knowledge base expected of qualified forensic psychophysiologists. Training at APA-accredited schools covers the theoretical foundations, practical applications, and research evidence underlying all aspects of polygraph methodology. Ongoing continuing education ensures practitioners stay current with developments in the field.

For comprehensive information on polygraph terminology and methodology, explore the complete polygraph glossary or visit the Polygraph Examiner Hub.

Cross-references

More scoring terms in this glossary

rank order analysis Rank order analysis assigns ranks to response intensities within a physiological channel. Methods for the CQT include... type II error A Type II error is the probability of not rejecting a false null hypothesis — failing to detect deception when it is ... Discriminant Analysis A statistical classification method used in several polygraph scoring algorithms (including PolyScore and CPS) to sep... Feature Extraction The process of identifying and measuring specific physiological response characteristics from raw polygraph data for ... Two-Stage Rules A decision framework used in the Empirical Scoring System (ESS) that applies two sequential tests to determine the fi... Pearson product-moment correlation The Pearson product-moment correlation tests the linear relationship between two sets of interval-level data, produci...

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