The New Complex Trial Protocol for Deception Detection ：新的复杂的试验协议欺骗检测.ppt

The New Complex Trial Protocol for Deception Detection ：新的复杂的试验协议欺骗检测
The Complex Trial Protocol is a brain-wave-basege of all irrelevant P300s over 3 weeks.
WEEK Hit Rate
Week 1 (no CM): 11/12 (92%)
Week 2 (CM): 10/11 (91%)
Week 3 (no CM): 11/12 (92%)
EXP 1:How does this CTP do in detecting incidental mock crime details?
3 groups (n=12)
Simple Guilty (SG), Countermeasure (CM), Innocent Control (IC)
All subjects first participated in a baseline reaction time (RT) test in which they chose a playing card.
SG and CM subjects then committed a mock crime.
Subjects stole a ring out of an envelope in a professor’s mailbox.
All subjects were then tested for knowledge of the item that was stolen. There were 1 P (the ring) and 6 I( necklace,watch,etc).
CM subjects executed covert assigned responses to irrelevant stimuli in an attempt to evoke P300s to these stimuli to try and beat the Probe vs. Irrelevant P300 comparison.
A CTP Trial
Results: Grand Averages: SG, CM, IC, all P
Guilty Diagnoses
Condition Detections Percentage
SG 10/12 83
CM 12/12 100
IC 1/12 8
RTs to S1 (P or I)
Conclusions
Unlike 3-SP, the CTP is highly sensitive at detecting incidentally acquired concealed knowledge in a mock-crime (as with autobiographical knowledge).
Another advantage of the CTP vs 3-SP or polygraph CIT: resistance to CM use.
CM use produces a large increase in RT between the baseline and test block, and within test block, probe vs irrelevant RT .
Enhanced CTP with autobiographical information.
5-button ‘I SAW it’ box. The subject is instructed to press, at random*, one of the 5 buttons.
We hoped that this would make CMs harder to do. It didn’t, but we caught the CM users anyway.
Design:
Autobiographical information (birthda