bizone

What Is the Bizone?

The bizone is a measurement zone used in some polygraph scoring methodologies that encompasses the physiological response area spanning two adjacent question locations — typically a relevant question and its paired comparison question. The bizone approach evaluates the combined response area rather than scoring each question location independently, providing a broader view of the physiological response pattern at each analysis spot.

How Bizone Scoring Works

In standard spot analysis, each analysis spot compares the response at a relevant question with the response at its designated comparison question. The bizone approach extends this concept by defining a larger measurement window that captures the complete physiological trajectory across both question presentations, rather than evaluating each question location as an isolated event.

This broader window can be particularly useful for capturing physiological responses that develop gradually or that persist from one question into the next. Some response features — particularly sustained changes in blood pressure baseline and gradual respiratory pattern shifts — may extend beyond the typical scoring window for a single question, and the bizone approach captures this extended response information.

Relationship to Standard Scoring

The bizone concept exists alongside more established scoring approaches such as the 7-position scale and computerised scoring algorithms. Most validated test data analysis methods use defined response windows at individual question locations, and the bizone represents an alternative measurement framework rather than a replacement for standard methods.

Practical Considerations

The choice of measurement window — whether narrow (single question location), standard, or extended (bizone) — affects what aspects of the physiological response are captured and weighted in the scoring process. The Kircher Features used in validated scoring specify particular measurement parameters for each feature, and examiners should follow the measurement protocols specified by the validated technique they are using rather than applying alternative measurement zones independently.