Psychology 323: Deception. J. P. Rosenfeld, Ph.D. [email protected] We should spend an equal time on phenomenology and MECHANISMS of deception….
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…as we do on DETECTION of deception. But there is a lot more research-based (real) knowledge about the latter, so most of the time, that’s what we will cover.
2. Physiological: Nervous system activity.
….We start with Behavioral:
1. People typically reveal their lies by fidgeting, acting nervous, avoiding eye contact, etc.
2. Therefore, we are rather good lie detectors (unless we are very stupid).
3. This is especially true when we detect lies in those close to us.
4. Criminals, con-men, professional crooks, and such, however, are harder to spot for us lay people.
5. Fortunately, trained professionals (police, FBI) are superior lie detectors, so they protect us against pros.
People think they are great lie detectors. But they miss many lies. Why?
(1a) If someone thinks you look great, why argue? (Vrij: Ostrich effect)
(Types of Lies)
“You made a great impression…”
Telling a gravely ill person (child) that she will be fine..
Self report fails because people don’t want to recall.
But 2+ times a day is a reasonable occurence.
(Are we all on same page? What are these?)
These are theories of what should happen. Moreover…
1)Getting videos: (Are cameras always running?)
2) Establishing “Ground Truth.”
3) Controls: only possible in lab to have unconfounded conditions—so not many field studies re: nonverbal cues are out there…
**But in D of D, the key statistic is INDIVIDUAL HIT RATE (as in d’ from SDT).
That is….speech signs…
Reality Monitoring, Statement Validity Assessment, & Scientific Content Analysis.
…would we think this strategy would be a good deception detector?
Are there differences between false memories and deceptions?
HINT: What do subjects believe about veracity of f.m. and lies?
5. Affect detail—How subject felt:” I was disgusted when I saw the body…”
6. Reconstructability of the testimony in detail.
7. Realism: Is the story plausible, realistic, logical?
8. Cognitive operations. Should be less in true story: It shouldn’t be necessary to make inferences: “He appeared nervous.”