Ground Truth
Definition
In deception-detection research, independently verified knowledge of whether a statement was truthful or deceptive, established through confession, DNA, or other objective means, against which a method's accuracy can be measured.
- Field
- Deception-detection research
- Verification sources
- Confession, DNA, or other objective evidence
- Function
- Benchmark for measuring a method's accuracy
Common questions
Why is ground truth so hard to obtain in real deception-detection studies?+
Most real-world statements never get independently verified, since cases go unsolved or confessions are never obtained, so researchers often rely on staged laboratory deception instead. Laboratory ground truth is certain but the deception is low-stakes and artificial, which limits how well the results generalise to real interrogations.
How does the lack of solid ground truth affect claims made for methods like SCAN?+
Without a reliable ground-truth sample to test against, a method's claimed accuracy cannot be independently validated, which is a central criticism levelled at proprietary statement-analysis techniques that have not been subjected to blind, ground-truthed testing published in peer-reviewed literature.
Related terms
- Base Rate Problem
- The statistical challenge facing any deception-detection method: if only a minority of statements examined are actually deceptive, even a method that is...
- Extraneous Information
- Information in a statement that the SCAN analyst judges to be beyond the stated scope of the question. SCAN treats such additions...
- Lack of Conviction
- A SCAN category covering hedging phrases like 'I think', 'I believe', 'I don't remember', which Sapir proposes signal deception because a person...
- Pronoun Shift
- A SCAN indicator based on the claim that deceptive writers drop first-person pronouns or shift to third-person reference when describing events they...
- SCAN (Scientific Content Analysis)
- A proprietary statement-analysis method developed by Avinoam Sapir that claims to identify deceptive content in written statements through analysis of linguistic features...