Abstract
Eighty four sets of GKT field data (52 guilty and 32 innocent persons) were analyzed for tonic level of heart rate and respiration rate during polygraph interrogation. The innocent persons in our sample showed consistently lower heart rate than guilty persons and revealed significant decrease over the course of interrogation, whereas guilty persons did not. Respiration rate was not significantly different between these two groups. Although it is popularly believed that a naïve person tends to show and maintain higher cardiovascular and respiratory activity during polygraphy, and that this makes polygraph interrogation ineffective, such is not the case at least in the GKT polygraph.
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