Using Temporal Features of Observers’ Physiological Measures to Distinguish Between Genuine and Fake Smiles
Bibliographic record
Abstract
Future affective computing research could be enhanced by enabling the computer to recognise a displayer's mental state from an observer's reaction (measured by physiological signals), using this information to improve recognition algorithms, and eventually to computer systems which are more responsive to human emotions. In this paper, an observer's physiological signals are analysed to distinguish displayers' genuine from fake smiles. Overall, thirty smile videos were collected from four benchmark database and classified as showing genuine or fake smiles. Overall, forty observers viewed videos. We generally recorded four physiological signals: pupillary response (PR), electrocardiogram (ECG), galvanic skin response (GSR), and blood volume pulse (BVP). A number of temporal features were extracted after a few processing steps, and minimally correlated features between genuine and fake smiles were selected using the NCCA (canonical correlation analysis with neural network) system. Finally, classification accuracy was found to be as high as 98.8 percent from PR features using a leave-one-observer-out process. In comparison, the best current image processing technique [1] on the same video data was 95 percent correct. Observers were 59 percent (on average) to 90 percent (by voting) correct by their conscious choices. Our results demonstrate that humans can non-consciously (or emotionally) recognise the quality of smiles 4 percent better than current image processing techniques and 9 percent better than the conscious choices of groups.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.004 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".